Product Description

Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to *1% by weight, but is usually between 6 and *0%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. The internal structure of precious opal makes it diffract light. Depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the rarest, whereas white and greens are the most common. Opals vary in optical density from opaque to semitransparent.



This is a parcel of 5 Authentic Mexican Galaxy Opals ranging from 0.5 to *0 carats each. Each stone is one-of-a-kind from our family mines in Guadalajara Mexico.