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Three Notable Fancy-Colour Diamonds: Purplish Red, Purple-Pink and Reddish Purple

The description and properties of three fancy-colour diamonds auctioned at Christie's.

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Characterisation and Grading of Natural-Colour Pink Diamonds

Known for their great beauty and rarity, pink diamonds have long been sought after by jewellers, collectors and consumers.

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Diamond with Coesite Inclusions
Coesite Inclusions with Filaments in Diamond

Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.

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Bright yellow diamonds from Sierra Leone

Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitised feather inclusions.

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Yellow Diamond
Xenotime Inclusion in Yellow Diamond

Presents what is believed to be the first report of a xenotime inclusion in gem-quality diamond.

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Diamond with High Concentration of Nickel

Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.

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Fish-Like Inclusion Found in Fancy Yellow "Cape" Diamond

A recent lab examination at GIA New York revealed an inclusion in a rectangular Fancy Yellow called "pareidolia", which means it was a resemblance of the scales and form of a fish.

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Rough diamond, yellow in color
Article
Diamond Research Gives Clues to the Formation of the Continents

Mineral inclusions trapped in diamonds reveal the continents’ construction – and help GIA researchers date diamonds.

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A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.
Article
Autumn 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

G&G Brief presents an overview of the content of the Autumn 2015 issue of Gems & Gemology.

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