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Emerald

Emerald

Emeralds are fascinating gemstones. They have the most beautiful, most intense and most radiant green that c...

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Ruby

Ruby

Which colour would you spontaneously associate with love and vivacity, passion and power? It's obvious, isn'...

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Amethyst

Amethyst

Its colour is as unique as it is seductive, though in fact this gemstone of all gemstones is said to protect...

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Sapphire

Sapphire

In earlier times, some people believed that the firmament was an enormous blue sapphire in which the Earth...

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Opal

Opal

All of Nature’s splendour seems to be reflected in the manifold opulence of fine Opals: fire and lightnings,...

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Zultanite

Zultanite

A Turkish Delight When shopping for a gemstone, you are faced with an array of amazingly diverse choices, wi...

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Tsavorite Garnet

Tsavorite Garnet

The shining green tsavorite is a young gemstone with a very long geological history. Its home is the East-Af...

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Aquamarine

Aquamarine

From the light blue of the sky to the deep blue of the sea, aquamarines shine over an extraordinarily beauti...

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Tourmaline

Tourmaline

Tourmalines are gems with an incomparable variety of colours. The reason, according to an old Egyptian legen...

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Demantoid Garnet

Demantoid Garnet

The demantoid is one of the most brilliant gemstones that exist, yet until recently it was little known exce...

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Zircon

Zircon

Zircon: brilliant but misunderstood Hindu poets tell of the Kalpa Tree, the ultimate gift to the gods, a glo...

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Multicolored Tourmaline

Multicolored Tourmaline

Tourmalines are true miracles of colour. Crystals with only one colour are fairly rare, there mostly being v...

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Chrysoberyl

Chrysoberyl

Like the eye of a sleek feline predator, the chrysoberyl cat's eye winks at the astonished observer – a real...

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Beryls

Beryls

The magic of colours Colour appeals to our feelings directly. It makes us happy and cheerful, livens us up o...

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Bloodstone

Bloodstone

The martyr's gem Bloodstone, green jasper dotted with bright red spots of iron oxide, was treasured in ancie...

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Topaz

Topaz

It is a fluorine aluminium silicate and comes in yellow, yellow-brown, honey-yellow, flax, brown, green, blu...

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Citrine

Citrine

Let's suppose that someone has bought a moped, yet his friends and acquaintances keep talking about his 'won...

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Spinel

Spinel

Spinel: collector's favourite Spinel is the great impostor of gemstone history: many famous rubies in crown...

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Coral

Coral

Corals are a decorative material with a very special fascination - the perfect embodiment of Man's longing f...

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Blue Tourmaline

Blue Tourmaline

Tourmalines are the most colourful gemstone group. They occur in all variations, green, red, blue, yellow, c...

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Quartz

Quartz

Common chameleon If you gaze deep into a crystal ball, you will see a versatile gemstone, one of the most po...

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Morganite

Morganite

Alongside emerald and aquamarine, morganite is certainly the best known gemstone from the colourful group of...

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Jade

Jade

The myth of jade Jade – a gemstone of unique symbolic energy, and unique in the myths that surround it. With...

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Mandarin Garnet

Mandarin Garnet

Like fiery comets against the evening sky, the first mandarin garnets appeared in the gemstone trade a littl...

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Turquoise

Turquoise

The turquoise is ancient, yet again and again it finds itself back in fashion. Its shining sky blue is one o...

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Lapis Lazuli

Lapis Lazuli

Lapis lazuli is a gemstone of the kind that might have come straight out of the Arabian Nights: a deep blue...

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Chrome Diopside

Chrome Diopside

A beautiful gem with an ugly name Chrome diopside certainly won't win any contests for the most beautiful na...

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Peridot

Peridot

The vivid green of the peridot, with just a slight hint of gold, is the ideal gemstone colour to go with tha...

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Ametrine

Ametrine

Spinning purple into gold Do you love both the purple of amethyst and the sunny gold of citrine? Are you an...

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Tanzanite

Tanzanite

Tanzanite is an extraordinary gemstone. It occurs in only one place worldwide. Its blue, surrounded by a fin...

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Fancy Sapphires

Fancy Sapphires

Sapphire is often thought of as being synonymous with the colour blue: you can easily picture sapphire seas....

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Agate

Agate

Banded beauty No gemstone is more creatively striped by Nature than agate, chalcedony quartz that forms in c...

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Fire Opal

Fire Opal

Fire opals are unique in the lush world of the opals. They were already admired as symbols of the most ferve...

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Moonstone

Moonstone

The moonstone is characterised by an enchanting play of light. Indeed it owes its name to that mysterious sh...

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Rubellite Tourmaline

Rubellite Tourmaline

The rubellite is a particularly beautiful gemstone from the colourful family of the tourmalines. Its colour...

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Amber

Amber

The Jurassic gem Dinosaurs have been more popular than ever since their starring role in the film Jurassic P...

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Paraiba Tourmaline

Paraiba Tourmaline

These cupriferous tourmalines from the Mina da Batalha in the Federal Brazilian State of Paraiba are small,...

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Andalusite

Andalusite

Cognac cocktail Andalusite is named after Andalusia, the province of Spain where it was first discovered. An...

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Garnets

Garnets

Aren't garnets those wonderful deep-red gemstones you often find in antique jewellery? Well yes, to a certai...

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Diamond

Diamond

Not necessarily colourless It really is not our job here at the International Colored Gemstone Association t...

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Onyx

Onyx

Black magic In jewellery design as in fashion, colours look crisper against a background of black, and blac...

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Yellow Tourmaline

Yellow Tourmaline

The tourmaline is a real miracle of colour. It not only comes in green, red, blue, yellow, colourless and bl...

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Jasper

Jasper

Landscape in stone Jasper is an ornamental rock composed mostly of chalcedony, microcrystalline quartz, in a...

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Kunzite

Kunzite

Millions of years ago, deep in the bowels of our Earth, gemstones were created in innumerable variations. We...

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Pearls

Pearls

Very cultured Pearls are organic gems, created when an oyster covers a foreign object with beautiful layers...

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Alexandrite

Alexandrite

This rare gemstone is named after the Russian tsar Alexander II (1818-1881), the very first crystals having...

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Iolite

Iolite

Iolite: gem of the VikingsWhen Leif Eriksson and the other legendary Viking explorers ventured far out into...

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Green Tourmaline

Green Tourmaline

The tourmaline is a unique miracle of colour. The gemstone comes in green, red, blue, yellow, but there are...

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All about colored gemstones. A Publication of the International Colored Gemstone Association (ICA)

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Join ICA

Membership in the International Colored Gemstone Association affords industry professionals worldwide...

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ICA Bookstore

The International Colored Gemstone Association (ICA) provides this online bookstore as a service to the industry and is not to be considered an endorsement. 

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