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Jewellery insurance info, helpful guides, resources and industry-leading insights.

 

Jewellery Insurance

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Luxury Watches

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Jewellery Trends

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Engagement Rings

How to Avoid Damage to Your Finger and Engagement Ring if You Can’t Get it Off

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Who Should Insure the Engagement Ring: the Bride or the Groom?

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How to Resize an Engagement Ring

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Diamonds

Diamond Certificates Explained

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Retail vs Resale: The Value of a Diamond

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Not Your Style? A Guide to Resetting Your Family Heirloom Diamond Ring

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General

Antiques Roadshow. Are You Sitting on a Gold Mine?

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How to Propose & The Best Places to Do it in Australia

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Helpful Resources

Featured Resource

The Complete Guide to Jewellery Insurance

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Featured Resource

The Ultimate Guide to Luxury Watches

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Featured Resource

Ring Size Guide & Sizer

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 Diamond cutting vastly improves the brilliance and sparkle of rough diamonds. Diamonds often come out of the ground looking like any other rock – we can step in to release their inner beauty and lustre.

But sometimes, a rough diamond can also be a thing of beauty. When they form, diamonds crystallise as octohedrons, cubes or dodecahedrons, can even exhibit two or more of these shapes, and little triangles called trigons may be visible on the surface.

Many of the images below are higher resolution than they are displayed, click on them to see the larger version.

 

29.6-carat blue diamond discovered in the Cullinan mine, South Africa. 29.6-carat blue diamond discovered in the Cullinan mine, South Africa. The “exceptional” vivid blue stone could “yield a polished stone of great value and importance”, the company said in a statement.

 

Rare blue diamond discovered at the Cullinan mine, South Africa. Another shot of the 29.6-carat blue diamond discovered in the Cullinan mine, South Africa.

 

Leibish Pink Promise as 4.96 carat rough diamond The Type IIa 36.06-carat pink stone has “exquisite gemological characteristics”. Leibish Pink Promise as a 4.96 carat rough diamond.

 

Natural Rough Blue Diamond Natural Rough Blue Diamond

 

The Argyle Pink Jubilee is a rough pink diamond and the largest rough pink diamond unearthed in Australia. Weighing 12.76 carats, it was found at the Rio Tinto Argyle diamond mine in Western Australia. The Argyle Pink Jubilee is a rough pink diamond and the largest rough pink diamond unearthed in Australia. Weighing 12.76 carats, it was found at the Rio Tinto Argyle diamond mine in Western Australia.

 

This 498 carat diamond was discovered in Lesotho, Africa. This 498 carat diamond was discovered in Lesotho, Africa.

 

Bespoke Jewellery Insurance

trigons on the surface of a diamond Trigons on the surface of a diamond

 

91.65 carat gem quality octahedron rough diamond A high resolution photo of a 91.65 carat gem quality octahedron rough diamond sold by Diamcor, a Canadian diamond mining company. It went for $817,920.00 (US), or $8,917.58 (US) per carat. Click on this photo and have a look in full screen – you’ll see lots of little triangle shapes (called trigons) on the surface of the diamond.

 

A demonstration of how rough diamonds can be divided before being cut into round brilliants. Before and after: a demonstration of how rough diamonds can be divided before being cut.

 

This is a diamond with a garnet inclusion from Siberia. This is a diamond with a garnet inclusion from Siberia. Unfortunately it’s only 2mm in diameter. This kind of stone is of special interest to scientists, as they give chemical clues to their age, how they were created, and how the earth’s crust behaves over massive timescales.

 

The "Incomparable" in its rough 890ct form on the left, and the finished 407.48ct stone in its gold ornament stand, right. The “Incomparable” in its rough 890ct form on the left, and the finished 407.48ct stone in its gold ornament stand, right. The rough also yielded 14 satellite stones of various colours from yellow with a slight brown overtone to pale yellow, and the rest were virtually colourless. The Incomparable sold as part of a necklace for $55 million, gaining an entry in the Guinness Book of Records for the world’s most expensive necklace.

 

The 253.7-carat Oppenheimer Diamond is in the shape of an octahedron (an eight-sided double pyramid), which is the common shape for diamond crystals. This diamond is 3.8 cm (1.5 in) in height and was discovered at the Dutoitspan Mine near Kimberley, South Africa in 1964. The Oppenheimer Diamond is unusual because diamonds of its size are rarely left uncut. Photo by Chip Clark, Smithsonian Institution. The 253.7-carat Oppenheimer Diamond is in the shape of an octahedron (an eight-sided double pyramid), which is the common shape for diamond crystals. This diamond is 3.8 cm (1.5 in) in height and was discovered at the Dutoitspan Mine near Kimberley, South Africa in 1964. The Oppenheimer Diamond is unusual because diamonds of its size are rarely left uncut. Photo by Chip Clark, Smithsonian Institution.

 

Lucara Diamond Corporation recovered this 239.2 carat diamond from its Karowe mine in Botswana. Two more exceptional stones were recently found at the mine, including a stone weighing 124 carats and another weighing 71.1 carats. Lucara Diamond Corporation recovered this 239.2 carat diamond from its Karowe mine in Botswana. Two more exceptional stones were recently found at the mine, including a stone weighing 124 carats and another weighing 71.1 carats.

 

Group of natural diamond crystals. Group of natural diamond crystals

 

Petra Diamonds recovered this 25.5 carat blue diamond at its famous Cullinan mine. Petra Diamonds recovered this 25.5 carat blue diamond at its famous Cullinan mine.

 

The most common shape for rough gem quality diamond is the octahedron, which looks like two pyramids back to back. Crystals that are almost perfect in shape and transparency are called glassies. The most common shape for rough gem quality diamond is the octahedron, which looks like two pyramids back to back. Crystals that are almost perfect in shape and transparency are called glassies.

 

Twinned diamond crystal, called a "Macle" Twinned diamond crystal, called a “Macle”

 

To see how little it can cost you to protect your treasures with specialised jewellery insurance, get an instant online quote below.

 

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Engagement Ring Budget Calculator

What you need to save to meet your timeframe and budget is:

This has not taken cut, colour, clarity or carat, your financial situation or your partners taste into account. There are many factors that can reduce or increase the value of an engagement ring.


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