Fireworks. Jellyfish. Galaxies. Lightning. Opal’s shifting play of kaleidoscopic colors is unlike any other gem.

Because opal has the colors of other gems, the Romans thought it was the most precious and powerful of all. The Bedouins believed that opals contained lightning and fell from the sky during thunderstorms. When Australia’s mines began to produce opals commercially in the 1890s, it quickly became the world’s primary source for this October birthstone.

Fun Facts

Grids of silica spheres of 0.2 microns in size creates the red play-of-color flashes in Opal
Opal contains up to 20% water trapped in its silica structure.
The novel “Anne of Geierstein” gave opal a reputation of being unlucky.
Birthstone October
Mineral Hydrated Silica
Color All colours
Refractive index 1.37-1.47
Birefringence None
Specific Gravity 2.15 (+0.08, -0.90)
Mohs Hardness 5 to 6.5