Fossil Coral 12mm Coin 8-Inch Blue Chalcedony Its bright green coloration is

Its bright green coloration is due to traces of chromium

The stone's composition remains somewhat ambiguous

and chromium lends a beautiful pink or purple

Tourmaline is classified as a semiprecious stone and occurs in a vast array of colors

It occurs with wave-like bands of charcoal gray

Fossil Coral 12mm Coin 8-Inch Blue Chalcedony Its bright green coloration isFossil Coral is the prehistoric fossilized remains of the invertebrate reef builders that live in tropical oceans. Silica rich waters create hardened deposits that preserve coral skeletons, resulting in fossils that are chalk white, tan, gray, and brown as well as pink, red and yellow orange.