was the key to their success. Why?.
Rhodochrosite
Rhodochrosite is another relative newcomer to the trade, having been on the market only since 1940. It can be
Emerald
The chromium and vanadium present in emerald produce its vibrant colour, which is stable against light and heat and so
Malachite
Malachite was so popular in the 19th century that the Russian royal family panelled whole rooms with it, and the
Iolite (cordierite or dichroite)
What most people don't realize is that top-quality iolite rivals the best tanzanite in both colour and saturation. If
Andean opal
Andean opal has become very popular because of its bright turquoise colour.
Nevada Black Opal
The rarest and most valuable opals are bright on black. Black background opals show off the rainbows of fire, or play
Tugtupite
According to Inuit legend, tugtupite possesses a special power. In the presence of lovers it will glow