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Translucent gemstone composed of beryllium aluminium oxide that can be brown, green or orange but is most commonly yellow, is characteristically hard and extremely valuable in the jewellery industry.
Gemstone composed of magnesium silicate that is the transparent, green variety of olivine.
Gemstone that is composed of a group of silicate minerals, can have varying degrees of transparency and exists in a range of colours, most commonly red.
Gemstone that is the translucent, purple-blue variety of zoisite and characteristically displays different colour saturation when viewed at different angles.
Gemstone composed of aluminium silicate of which the crystals are naturally large and occur in a variety of colours, the most common being pale yellow, brown, grey and light blue.
Gemstone that is the blue-green variety of beryl and forms perfect hexagonal, totally transparent crystals.
Opaque gemstone made up of aluminium and copper that is a distinctive blue colour, is porous and has a naturally waxy luster.