Coloured Gem Stones

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These are just a few of the gemstone mined around the world, there are many more in all colours shapes and sizes.

At JewelCraft we can help select the perfect stone for the occasion: Diamond, Diamond Coloured, Sapphire, Ruby, Emerald, Aquamarine, Amethyst, Citrine, Opal, Tourmaline, Topaz, Jade, Greenstone, Garnet, Tanzanite, Spinel, Pearl, Peridot, Iolite...

PreciousGems 000006118646-650px

Diamond, Diamond Coloured, Sapphire, Ruby, Emerald, Aquamarine, Amethyst, Citrine, Opal, Tourmaline, Topaz, Jade, Greenstone, Garnet, Tanzanite, Spinel, Pearl, Peridot, Iolite...

These are just a few of the gemstone mined around the world, there are many more in all colours shapes and sizes, At JewelCraft we can help select the perfect stone for the occasion.

Stone

Hardness

Mineral Family

Colour(s)

Sources

Treatment

Diamond

10

Diamond

(Carbon)

Colourless

Russia, South Africa, Australia, Tanzania, China

Diamond Coloured

10

Diamond

(carbon)

Yellow, blue, brown, black, green, red, pink

Australia, brazil, South Africa, Russia

Some are mined in this state others are heat treated to produce the colour

Sapphire

9

Corundum

Blue is the most common, from light blue to black, but also pink yellow green purple

Thailand, Srilanka, Australia, Burma

Heating is common and industry accepted form of colour enhancing.

Beware of lead crystal enhancement

Ruby

9

Corundum

Red

Thailand, Srilanka, Vietnam, Burma

Heating is common and industry accepted form of colour enhancing.

Beware of lead crystal enhancement

Emerald

7.5-8

Beryl

Light to dark green

Columbia, brazil, Zimbabwe, ,South Africa

Wax and or oil is added to hide fractures

Aquamarine

7.5-8

Beryl

Light Blue, Blue, blue green

Brazil, India, Madagascar, Russia, USA

Heat treatment may be used to enhance

Amethyst

7

Quartz

Purple

USA Brazil, Mexico, India, China

Heat, irradiation can be used to enhance colour

Citrine

7

Quartz

Light Yellow- Golden Brown

Brazil, USA, Spain, Russia, France, Scotland

Heat treatment is common

Opal

5.5-6.5

Silica Gel

White, black, grey, orange and rainbow

Australia, Brazil, Mexico, USA

Heat and oils

Tourmaline

7-7.5

Tourmaline

Green, pink, red, multi-coloured

Sri-Lanka, Russia, Burma, China, Kenya, USA, Brazil

Heat to lighten, irradiation to darken

Topaz

8

Topaz

Colourless, yellow, brown, light blue, green

Sri-Lanka, Russia, Burma, China, Kenya, Japan, Australia,, Brazil

Heat, irradiation can be used to enhance colour

Jade, Greenstone

8

Jade

Green, brown yellow

New Zealand, China, Canada, Russia

Dyeing in pale greenstone

Garnet

7-7.5

Garnet

Red, Green, yellow, orange

Thailand, Afriac

Heat

Tanzanite

6-7

Zoisite

Blue, purple, violet

Tanzania

Heat

Spinel

8

Spinel

Red, blue, orange black, green, pink

Burma, Sri-Lanka, Thailand, Afghanistan

Heat

Pearl

2.5-4

Organic substance

Cream, white, pink, blue, black

Japan, china, Tatihi, cook islands, Australia

Bleach, dye, irradiation

Peridot

6.5-7

Olivine

Yellow-green, olive green, brown

Burma, South Africa, Zaire, Isle of St John

None

Iolite

7-7.5

Iolite

Purple, purple-blue

Burma, Brazil, Sri-Lanka, India

none