Emerald is the green to greenish blue variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colours.
Read MoreRuby is the most valuable variety of the corundum mineral species, which also includes sapphire.
Read MorePerhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colours. Learn about the factors that make pearls so popular and desirable!
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Webinars are an easy, informal way for GIA experts to share information and stay connected with the community of researchers and gem and jewellery lovers.
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Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference
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The potential of 3-D printing is mind-boggling for jewellery design and manufacturing, where time, precision and cost-effectiveness are highly valued.
Read MoreLos Angeles designer designs a popular political pendant, and is earning national press coverage and finding fans among Hollywood A-listers.
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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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