Gemstone of Opal Ethiope rectangular cushion 5.94 ct.

TheOpal Ethiopian, like all opals, it is a inorganic gem amorphous, ie free of an ordered crystalline structure. It is silica (silicon dioxide) rich in water. The formation of theopal it takes place through a slow deposition of a colloidal silica gel In layers, lenses, or small cavities.

Theopal Ethiopian, like other opals, is characterized by the optical phenomenon called "color game"; It is a light diffraction effect on silica molecules. Depending on their dimensions, a different color (bright wave length) will be visible, for example red, green, blue, yellow, violet.