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Explore Q Report's Content Centre for expert advice on jewellery insurance. You can also read e-guides and blogs, watch videos and more.

Explore Q Report's Content Centre for expert advice on jewellery insurance. You can also read e-guides and blogs, watch videos and more.

Jewellery, engagement ring & watch advice, plus insurance tips & industry insights. 

Watch expert tips, discover insurance benefits & hear real customer stories. 

Find answers to common questions about jewellery, engagement ring & watch insurance. 

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What’s the “Best” Diamond Size for Your Partner?

Q Report Team

Updated on March 17, 2025
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 When you decide to take the momentous step of proposing to your partner, a world of choices opens up before you, particularly when it comes to selecting the perfect engagement ring. In Australia, where trends and preferences can vary, understanding what constitutes the average diamond size and the most popular engagement ring size can be crucial.

This guide is here to help you navigate these choices, focusing on what's considered the best carat size for an engagement ring in Australia. In embarking on this journey, it's important to consider the average engagement ring size and diamond carat that resonates most with Australian preferences.

However, more than just following trends, the choice you make should reflect a deeper understanding of your partner's unique style and personality. This thoughtful approach in selecting the ideal engagement ring, be it in carat size or design, is a true testament to the love and dedication you share with your partner.

Save For Later Need proposal ideas? Open this blog in a new tab and save it for later.

How Do You Determine Diamond Size?

 

Diamond size is determined by carat. A diamond’s carat is the measurement of the diamond’s weight. There can actually be a surprising visual difference between carat sizes. For example, a 1.5 carat diamond is noticeably bigger than a 1-carat diamond. 


Diamond Carat Sizing Chart
Carat  Size
0.25ct 4.0mm
0.5ct 5.0mm
0.75ct 5.8mm
1.00ct  6.5mm
1.25ct 7.0mm
1.5ct 7.4mm
1.75ct 7.8mm
2.00ct  8.2mm
3.00ct  9.3mm

 

Deciding on a Diamond Size

 

There are a few factors to consider when deciding on a diamond size for your partner’s engagement ring. You have to factor in both your budget and your partner’s wants. Knowing these two things will make choosing a diamond size a much simpler decision.

Figure Out Your Budget

On average, Australians spend about $5000 on an engagement ring. This may sound like a scary number but knowing what you and your partner are looking for in a ring can make budgeting easier. Choosing a diamond size that’s within your budget and matches your partner’s preference is key to choosing the perfect ring.

Read more at The Beginner's Guide To Buying Diamonds

Know Your Partner’s Style

 

Whether the proposal is going to be a surprise or not, it’s a good idea to have a discussion about engagement rings with your partner at least once before choosing a ring. This will help you get a better idea of what your partner wants. Finding out what cut and colour your partner prefers for the diamond will make it easier to choose a size.

If you don’t want to ruin the surprise, a simple way to determine your partner’s taste in rings is to look at what other jewellery they own. Does your partner wear extravagant, eye-catching jewellery? This could indicate that a bigger diamond, like a 1.5 carat size, could be a good choice. If your partner tends to wear understated, simple jewellery, a smaller sized diamond, say a .5 carat diamond, might be more suitable.

At the end of the day, your partner’s preference is the most important factor in choosing a diamond. She will wear this ring for the rest of her life -- you want her to love it.


How Can You Get the Diamond Size You Want While Staying in Budget?

What happens when your partner’s engagement ring preference doesn’t fit into your budget? The good news is that diamond size isn’t the only factor that affects ring price. 

There are four elements to every diamond:

  • Cut
  • Colour
  • Clarity
  • Carat

Knowing this, is it possible to sacrifice either cut, colour or clarity so that you can get the carat you want? The short answer is yes.

Cut

Round brilliant cut rings are the most popular, also making them the most expensive. Round rings can cost up to 25% more than other cuts such as heart or princess. Round cut diamonds tend to get the more expensive at 1 carat, so if your partner has her heart set on the classic round cut, choosing a size under 1 carat might help keep the price down. 

Additionally, oval and pear cut rings are the next two most popular and expensive rings. Opting for a radiant, princess or emerald cut ring could be the answer to getting your partner the carat size she wants while still staying within budget.

Colour 

The colour of the diamond is a key aspect that impacts its visual appeal. Diamonds are graded from D (colourless) to Z (light yellow or brown), with colourless being the most valuable. If size is a priority for your partner, choosing a diamond in the near-colourless range (G-J) can be a cost-effective option. These diamonds appear almost colourless, especially when not compared side-by-side with higher grades.

The setting of the ring also affects the perception of the diamond's colour. For instance, yellow gold settings can make slightly yellow diamonds look more colourless, whereas white gold or platinum may highlight the diamond's natural hue. This means that a well-chosen setting can enhance the appearance of a lower colour grade diamond, balancing beauty and budget effectively.

Clarity

Clarity is a “…measurement that notes the number and severity of a diamond’s imperfections, ranging from flawless (FL) to severely included (I3).” Choosing a diamond with a few more imperfections is another way you can cut costs.

Carat

When selecting the best carat size for your partner's engagement ring, it's useful to consider the preferences and trends in Australia. The average diamond size for engagement rings in Australia is around 1.0 carat, with the most frequently purchased sizes being 0.5, 1.0, 1.25, and 1.5 carats. A one-carat diamond ring is often viewed as a classic and desirable choice in Australia.

In Australia, there is a focus on quality over size, with many opting for a smaller, higher-quality diamond rather than a larger stone with visible flaws. This preference is reflected in the average spending on engagement rings, which ranges between $5,000 and $12,000, often resulting in diamond sizes between 3/4 carat to 1 carat.

Ultimately, the best carat size for your partner's engagement ring should align with their preferences, your budget, and the ring's symbolism in your relationship, rather than solely focusing on the average or most popular sizes in Australia.

It’s All About Personal Preference

The truth is, there is no “best” diamond size. It’s all about your partner’s taste and preference. She’s going to wear that ring for the rest of her life, so it should be a size she’s comfortable having on her hand every day. If you know your partner’s preference and you know your budget, it’s time to go engagement ring shopping.

Now that you’re ready to pick out your partner’s engagement ring, don’t forget to get it insured. Your partner’s special engagement ring deserves the best protection. Contact us for an instant quote and find out why thousands of Australians trust Q Report to insure their engagement rings.

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Purchase Amount

To get an accurate insurance quote, please provide the amount from your purchase receipt.

Don't have the receipt?

If you don't have the receipt, you can provide the most recent valuation amount instead.

OK
Related Posts
Featured Posts
avatar_light
Jewellery Insurance

Instant Quote
play-audio
Listen to article
/

 

 When you decide to take the momentous step of proposing to your partner, a world of choices opens up before you, particularly when it comes to selecting the perfect engagement ring. In Australia, where trends and preferences can vary, understanding what constitutes the average diamond size and the most popular engagement ring size can be crucial.

This guide is here to help you navigate these choices, focusing on what's considered the best carat size for an engagement ring in Australia. In embarking on this journey, it's important to consider the average engagement ring size and diamond carat that resonates most with Australian preferences.

However, more than just following trends, the choice you make should reflect a deeper understanding of your partner's unique style and personality. This thoughtful approach in selecting the ideal engagement ring, be it in carat size or design, is a true testament to the love and dedication you share with your partner.

Save For Later Need proposal ideas? Open this blog in a new tab and save it for later.

How Do You Determine Diamond Size?

 

Diamond size is determined by carat. A diamond’s carat is the measurement of the diamond’s weight. There can actually be a surprising visual difference between carat sizes. For example, a 1.5 carat diamond is noticeably bigger than a 1-carat diamond. 


Diamond Carat Sizing Chart
Carat  Size
0.25ct 4.0mm
0.5ct 5.0mm
0.75ct 5.8mm
1.00ct  6.5mm
1.25ct 7.0mm
1.5ct 7.4mm
1.75ct 7.8mm
2.00ct  8.2mm
3.00ct  9.3mm

 

Deciding on a Diamond Size

 

There are a few factors to consider when deciding on a diamond size for your partner’s engagement ring. You have to factor in both your budget and your partner’s wants. Knowing these two things will make choosing a diamond size a much simpler decision.

Figure Out Your Budget

On average, Australians spend about $5000 on an engagement ring. This may sound like a scary number but knowing what you and your partner are looking for in a ring can make budgeting easier. Choosing a diamond size that’s within your budget and matches your partner’s preference is key to choosing the perfect ring.

Read more at The Beginner's Guide To Buying Diamonds

Know Your Partner’s Style

 

Whether the proposal is going to be a surprise or not, it’s a good idea to have a discussion about engagement rings with your partner at least once before choosing a ring. This will help you get a better idea of what your partner wants. Finding out what cut and colour your partner prefers for the diamond will make it easier to choose a size.

If you don’t want to ruin the surprise, a simple way to determine your partner’s taste in rings is to look at what other jewellery they own. Does your partner wear extravagant, eye-catching jewellery? This could indicate that a bigger diamond, like a 1.5 carat size, could be a good choice. If your partner tends to wear understated, simple jewellery, a smaller sized diamond, say a .5 carat diamond, might be more suitable.

At the end of the day, your partner’s preference is the most important factor in choosing a diamond. She will wear this ring for the rest of her life -- you want her to love it.


How Can You Get the Diamond Size You Want While Staying in Budget?

What happens when your partner’s engagement ring preference doesn’t fit into your budget? The good news is that diamond size isn’t the only factor that affects ring price. 

There are four elements to every diamond:

  • Cut
  • Colour
  • Clarity
  • Carat

Knowing this, is it possible to sacrifice either cut, colour or clarity so that you can get the carat you want? The short answer is yes.

Cut

Round brilliant cut rings are the most popular, also making them the most expensive. Round rings can cost up to 25% more than other cuts such as heart or princess. Round cut diamonds tend to get the more expensive at 1 carat, so if your partner has her heart set on the classic round cut, choosing a size under 1 carat might help keep the price down. 

Additionally, oval and pear cut rings are the next two most popular and expensive rings. Opting for a radiant, princess or emerald cut ring could be the answer to getting your partner the carat size she wants while still staying within budget.

Colour 

The colour of the diamond is a key aspect that impacts its visual appeal. Diamonds are graded from D (colourless) to Z (light yellow or brown), with colourless being the most valuable. If size is a priority for your partner, choosing a diamond in the near-colourless range (G-J) can be a cost-effective option. These diamonds appear almost colourless, especially when not compared side-by-side with higher grades.

The setting of the ring also affects the perception of the diamond's colour. For instance, yellow gold settings can make slightly yellow diamonds look more colourless, whereas white gold or platinum may highlight the diamond's natural hue. This means that a well-chosen setting can enhance the appearance of a lower colour grade diamond, balancing beauty and budget effectively.

Clarity

Clarity is a “…measurement that notes the number and severity of a diamond’s imperfections, ranging from flawless (FL) to severely included (I3).” Choosing a diamond with a few more imperfections is another way you can cut costs.

Carat

When selecting the best carat size for your partner's engagement ring, it's useful to consider the preferences and trends in Australia. The average diamond size for engagement rings in Australia is around 1.0 carat, with the most frequently purchased sizes being 0.5, 1.0, 1.25, and 1.5 carats. A one-carat diamond ring is often viewed as a classic and desirable choice in Australia.

In Australia, there is a focus on quality over size, with many opting for a smaller, higher-quality diamond rather than a larger stone with visible flaws. This preference is reflected in the average spending on engagement rings, which ranges between $5,000 and $12,000, often resulting in diamond sizes between 3/4 carat to 1 carat.

Ultimately, the best carat size for your partner's engagement ring should align with their preferences, your budget, and the ring's symbolism in your relationship, rather than solely focusing on the average or most popular sizes in Australia.

It’s All About Personal Preference

The truth is, there is no “best” diamond size. It’s all about your partner’s taste and preference. She’s going to wear that ring for the rest of her life, so it should be a size she’s comfortable having on her hand every day. If you know your partner’s preference and you know your budget, it’s time to go engagement ring shopping.

Now that you’re ready to pick out your partner’s engagement ring, don’t forget to get it insured. Your partner’s special engagement ring deserves the best protection. Contact us for an instant quote and find out why thousands of Australians trust Q Report to insure their engagement rings.

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Table of Contents

Introduction
Understanding the 4 Cs of Diamonds
Diamond Shapes
Choosing a Ring Style
Selecting a Ring Retailer

Understanding Mechanical Movements

Rolex-super-precision

Unlike their battery-powered quartz counterparts, luxury watches have a beating heart – the mechanical movement. First created in the 14th century, large, weight-driven tower clocks with verge escapements and foliot balances marked the dawn of mechanical timekeeping.

Today, the core concept of mechanical movements remains unchanged from its original conception. It involves an intricate arrangement of gears, springs, and an escapement powered by a wound mainspring. This precision engineering allows for smooth operation and precise timekeeping.

Manual watch movements require the wearer to wind the crown periodically. Automatic watch movements, on the other hand, utilise the wearer's movements to keep the mainspring wound, offering a convenient everyday solution.

The Patek Philippe Calatrava, with its ultra-thin manual movement, exemplifies the elegance of traditional watchmaking. On the other hand, the Rolex Oyster Perpetual, with its self-winding mechanism epitomises practicality and durability.

Whether manual or automatic, a mechanical movement imbues a luxury watch with a soul, a testament to human ingenuity and a treasured heirloom for generations to come

Luxury Watch Complications: Exploring Hidden Features & Functionality

Luxury watches often boast 'complications,' intricate mechanisms that add layers of sophistication, style and utility. Here, we explore some of the most fascinating complications created by the best luxury watch brands.

Statistic Heading

Rolex-super-precision

Unlike their battery-powered quartz counterparts, luxury watches have a beating heart – the mechanical movement. First created in the 14th century, large, weight-driven tower clocks with verge escapements and foliot balances marked the dawn of mechanical timekeeping.

Today, the core concept of mechanical movements remains unchanged from its original conception. It involves an intricate arrangement of gears, springs, and an escapement powered by a wound mainspring. This precision engineering allows for smooth operation and precise timekeeping.

Manual watch movements require the wearer to wind the crown periodically. Automatic watch movements, on the other hand, utilise the wearer's movements to keep the mainspring wound, offering a convenient everyday solution.

The Patek Philippe Calatrava, with its ultra-thin manual movement, exemplifies the elegance of traditional watchmaking. On the other hand, the Rolex Oyster Perpetual, with its self-winding mechanism epitomises practicality and durability.

Whether manual or automatic, a mechanical movement imbues a luxury watch with a soul, a testament to human ingenuity and a treasured heirloom for generations to come

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Common Diamond Alternatives
for Engagement Rings

Tanzanite

Contents insurance is essential for anyone who owns valuable items, as it helps protect you should a potential loss occur in your.

Aquamarine

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Sapphire

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Luxury Watch Complications: Exploring Hidden Features & Functionality

Luxury watches often boast 'complications,' intricate mechanisms that add layers of sophistication, style and utility. Here, we explore some of the most fascinating complications created by the best luxury watch brands.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

Peace of Mind: An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

“Knowing your engagement ring is insured brings peace of mind. Accidents can happen, and insurance coverage alleviates the worry and stress of potential loss or damage.”

Unlike their battery-powered quartz counterparts, luxury watches have a beating heart – the mechanical movement. First created in the 14th century, large, weight-driven tower clocks with verge escapements and foliot balances marked the dawn of mechanical timekeeping.

Today, the core concept of mechanical movements remains unchanged from its original conception. It involves an intricate arrangement of gears, springs, and an escapement powered by a wound mainspring. This precision engineering allows for smooth operation and precise timekeeping.

Manual watch movements require the wearer to wind the crown periodically. Automatic watch movements, on the other hand, utilise the wearer's movements to keep the mainspring wound, offering a convenient everyday solution.

The Patek Philippe Calatrava, with its ultra-thin manual movement, exemplifies the elegance of traditional watchmaking. On the other hand, the Rolex Oyster Perpetual, with its self-winding mechanism epitomises practicality and durability.

Whether manual or automatic, a mechanical movement imbues a luxury watch with a soul, a testament to human ingenuity and a treasured heirloom for generations to come

Export
Expert Tip

Budget Considerations

Diamond shapes can vary in price due to popularity and demand. Round brilliants, for example, tend to be more expensive than other shapes due to their high demand. If budget is a concern, consider alternative shapes or prioritise other aspects, such as cut quality, over the shape itself.

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Jewellery Insurance FAQ

Contents insurance covers the items within your home in case they are damaged, lost or stolen. This can include furniture, electronics, clothing and other personal.  Contents insurance is essential for anyone who owns valuable items, as it helps protect you should a potential loss occur in your.

Contents insurance covers the items within your home in case they are damaged, lost or stolen. This can include furniture, electronics, clothing and other personal.  Contents insurance is essential for anyone who owns valuable items, as it helps protect you should a potential loss occur in your.
Home Security Fortification

An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

An engagement ring is a significant financial and sentimental investment. Specialised.

Travel Savvy

An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

An engagement ring is a significant financial and sentimental investment. Specialised.

Social Media Caution

An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

An engagement ring is a significant financial and sentimental investment. Specialised.

Regular Valuations

An engagement ring is a significant financial and sentimental investment. Specialised engagement ring insurance provides financial protection in the event of loss, theft or damage by ensuring you can recover the ring's monetary value or repair or replace.

An engagement ring is a significant financial and sentimental investment. Specialised.

bulb
0%

Contents insurance is essential for anyone who owns valuable items, as it helps protect you should a potential loss occur in your.

Luxury Watch Complications: Exploring Hidden Features & Functionality

Luxury watches often boast 'complications,' intricate mechanisms that add layers of sophistication, style and utility. Here, we explore some of the most fascinating complications created by the best luxury watch brands.

Home Security Fortification

Contents insurance covers the items within your home in case they are damaged, lost or stolen. This can include furniture, electronics, clothing and other personal.  Contents insurance is essential for anyone who owns valuable items, as it helps protect you should a potential loss occur in your.

Purchase Amount

To get an accurate insurance quote, please provide the amount from your purchase receipt.

Don't have the receipt?

If you don't have the receipt, you can provide the most recent valuation amount instead.

OK

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