In this study, the Bangkok laboratory examined five low-quality bead cultured pearls sourced directly from a local pearl factory and characterised their features before and after processing.
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Recently, GIA’s laboratory in New York had the opportunity to examine a fascinating pearl find and hear about an even more fascinating story.
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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.
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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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