Gemmological photojournalist Robert Weldon shares the stories behind some of his favourite photos.
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Ruby and sapphire (usually blue, but also in every other colour) have been the most important coloured gemstones for several thousand years. Originating historically in south-east and central Asia, and more recently in eastern Africa, these coloured varieties of the mineral corundum have been much sought as gems because of their rarity, colour and durability. Gem corundum can display asterism and chatoyancy due to the presence of oriented mineral inclusions, and in some cases, a change of colour when viewed under different light sources.
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Chemically pure beryl is colourless, but trace elements give rise to green, blue and pink/red colours.
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Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
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Examination of aquamarine samples from a new primary deposit in San Luis Potosí, northern Mexico.
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All jewellery professionals are familiar with the city of Shenzhen, a global jewellery manufacturing centre and a leader of China’s fast-growing gem and jewellery industry. Join the GIA team as we tour the city and discover more about its leading jewellery brands.
Read MoreFirst in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
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The authors have encountered hundreds of polymer-filled aquamarines in the Chinese jewellery market.
Read MoreThis article presents, for the first time, both gemmological and geologic information on topaz, aquamarine and other beryls from miarolitic pegmatites at Namibia’s historic Klein Spitzkoppe mineral locality.
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