Gemmological photojournalist Robert Weldon shares the stories behind some of his favourite photos.
Read MoreImitation diamonds such as CZ and moissanite have been popular for decades. Learn about their properties and how they compare to diamonds.
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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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Found in nearly every colour – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness.
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Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
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Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
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Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
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Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
Read More
Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
Read More
Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
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