What has attracted people to opals over the centuries? Colour, colour and more colour! Opals change colour when you look at them from different sides and angles. Sometimes there is little colour at all and you move your head and suddenly a breathtaking burst of brilliant colour flashes from the stone. There are very few natural gemstones which do that.

Unless you are lucky the more you pay the better the quality is. But you can still get the high flashy colours for a lower price if you buy doublets or triplets. These are opal pieces reinforced with a solid backing of colorless opal. A triplet has a clear dome of quartz or other material on top.

Opal starts off as a silica gel which seeps through sedimentary strata and gradually hardens over millions of years and the process of nature. As an opal miner I have occasionally seen opal in this early stage where it is soft. Opals contain a lot of water as much as between 3 and 10 percent. On the Moh