Amethyst 7mm Cube Table Cut - 15-16 Inch Puff Oval A natural blue form of

A natural blue form of calcium sulfate

In lower grades it can be transparent to opaque and is commonly light blue

During the Renaissance

and it is the official birthstone of that month

Shattuckite is a pseudomorph

Amethyst 7mm Cube Table Cut - 15-16 Inch Puff Oval A natural blue form ofAmethyst is a beautiful purple stone, known as a Gem of Fire by ancient cultures. It has been greatly sought after throughout history and was at times valued as highly as Diamond. Today, this semi to precious variety of quartz is found in many locations around the world. The presence of Manganese within the stone produces the purple hue, and variation of the amount of iron in the stone creates a color range from reddish purple to deep violet to light