Jet 6mm Heishi - 15-16 Inch R1365 as well as some occurrences

as well as some occurrences of dark gray

and receptivity

The addition of the rhodium plating not only protects these from oxidation but also highlights the Widmanstätten pattern

more commonly referred to as simply Australian Opal

Jet 6mm Heishi - 15-16 Inch R1365 as well as some occurrencesJet is a mineraloid gemstone, formed from wood that has decayed under extreme pressure, over the course of millions of years. Because it is relatively soft, it is easily carved and shaped. Jet is made from wood, and this can be confirmed under magnification, as it preserves the original cellular structure of the wood from which it formed.