Black Spinel 4x8mm Faceted Rondelle - 15-16 Inch R1339 Specialists soak the stones in

Specialists soak the stones in resin or liquid plastic to help harden them

Due to its color and clarity

Porcelain Agate is a natural agate that is dyed and heated to give it the unique blue/white color and pattern that resembles porcelain

white and black

There is another form of Peridot that is not even native to the planet

Black Spinel 4x8mm Faceted Rondelle - 15-16 Inch R1339 Specialists soak the stones inSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.