Yellow Opal 6mm Faceted Round - 15-16 Inch Global-Turquoise It is a natural glass

It is a natural glass made up of pure silica

which may form green stains or specks on Azurite crystals or aggregates

Crazy Lace Agate is often dyed to produce colors that do not naturally occur in the stone

Smoky Quartz is a translucent smoky brown or gray variety of Quartz

and igneous rocks

Yellow Opal 6mm Faceted Round - 15-16 Inch Global-Turquoise It is a natural glassYellow Opal is transparent to opaque, milky white to pale yellow in color. It sometimes features dark brown to black dendritic inclusions that branch like tiny tree limbs through the stone. Unlike other forms of opal, Yellow Opal does not display the changeable flash of internal luster that other opals are known for. Historically Opal was renowned as the Queen of Gems for its desirability and beauty.