OPAL RAINBOW SILVER RING 2
Lovely Opal Rainbow Silver Ring 2. Good colour and solidly crafted .925 Silver Ring for sale. Rainbow colours in several directions. Hand made in NSW from solid Coober Pedy Opal.
Size 8,US or Q, 3.63g.
Stone 1.1cm x 0.85cm.
SiO2 · nH2O
Hydrated Silicon Dioxide.
Opal has been a popular gem for many centuries and has a very interesting structure. The chemistry of Opal is primarily SiO2 and varying amounts of water. The amount of water varies from 5 -10% and greater. This water can help geologists determine the temperature of the host rock at the time the opal formed.