News & Articles

A bright orange, multi-faceted gem.
Fall for Autumn Gems

Nature gives us a brilliant palette of colour-changing leaves and a spectacular kaleidoscope of colourful sunsets during the autumn season.

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Tourmalines
Factors in Coloured Stones that Interact to Affect Value

Part 4 of 5 in the series "Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond)" digs deeper into cutters’ choices and explores additional factors used in the trade to assess relative value.

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Kunzite top and side view
Coloured Stone Darkness & Brightness

Part 3 of 5 in the series "Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond)" examines how cutting decisions can have a profound affect on a gemstone’s colour quality.

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Firefighter Memorial
Gem Cutting Styles - Definitions

Part 2 of 5 in the series "Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond)" establishes a common language for discussing cutting styles, with a focus on basic faceting styles, and offers a short discussion on cabochons and beads.

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Coloured Gemstone Value Factors

Part 1 of 5 in the series "Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond)" discusses the major value factors that affect the prices of coloured gemstones.

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A blue diamond with inclusions under the table is held up in tweezers.
Where Do Blue Diamonds Come From?

Blue Diamonds Have a Surprising “Superdeep” Origin and a Link to Ancient Oceans

This is an extended abstract of the article ‘Blue boron-bearing diamonds from Earth’s lower mantle,’ published in the 2018 August issue of Nature. GIA researcher Evan Smith is the lead author of the article.

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