10 Carat Australian Boulder Opal Freeform Cabochon

Mexico Opal is composed of hydrated silica. It is an amorphous silicate, meaning it does not form crystals. Opals are structurally composed of tiny spheres of silica which, when arranged in perfect geometry, create the famous play of color associated with the stones. The symmetrical arrangement of silica balls acts like a prism, which allows the rainbow spectrum of colors to be visible to the naked eye. Fire opal is a transparent to translucent opal with warm body colors of yellow to orange to red. Although it does not usually show any play of color, occasionally a stone will exhibit bright green flashes. The most famous source of fire opals in Mexico is in the state of Queretaro; these opals are commonly called Mexican fire opals. Fire opals that do not show a play of color are sometimes referred to as jelly opals. Cantera opal...

This impressive 62.9 carat natural Fluorite gemstone is a museum-caliber specimen showcasing the stunning luminosity for which Fluorite is prized. With remarkable clarity and a spark...

This lovely 4.15 Ct Australian boulder opal was mined by Sue Cooper at her Russells opal mine in western Queensland, Australia in 2022. Sue processed the ro...

Description: Gem Type: Opal Number of Stones: 1 Weight: 3.55 cts Measurements: 16.42 x 6.51 x 4.80 mm Shape: Freeform Cutting Style: Cabochon Cutting Style Crown: Cutting Style Pa...