Diamond is the only gem made of a single element: It is typically about 99.95 per cent carbon. The other 0.05 per cent can include one or more trace elements, which are atoms that aren’t part of the diamond’s essential chemistry. Some trace elements can influence its colour or crystal shape.
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Alexandrite, with its chameleon-like qualities, is a rare variety of the mineral chrysoberyl. Its colour can be a lovely green in daylight or fluorescent light, changing to brownish or purplish red in the incandescent light from a lamp or candle flame.
Read MoreFancy colour diamonds come in almost any colour you can imagine. Red, green, purple and orange are generally the rarest, followed by pink and blue. Yellows and browns are the most common fancy colours, but they’re generally less valuable than the rarer colours.
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Learn more about one of the Earth’s most fascinating creations, including some that became the most famous.
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This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
Read MoreLearn about diamond's durability and how to care for your diamond jewellery.
Read MoreHigh-quality CVD-grown diamonds, comparable in colour and clarity to natural diamonds, can be identified using a combination of gemmological and spectroscopic properties.
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Exploration of a chart designed to give jewellers and gemmologists a practical guide to identifying synthetic diamonds as they enter the jewellery trade.
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The diamond industry has been buffeted by extreme price volatility during the last decade, unlike any encountered since the Great Depression of the 1930s.
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