Amethyst 6mm Round 15-16 Inch rounds_part_one Sardonyx is sometimes treated to

Sardonyx is sometimes treated to bring out its reddish tones

and it can be mottled or striated with veins of these colors

as waters loosen and decompose the organic elements and replace them with silicate substances

Dumortierite is an aluminum borosilicate mineral that varies in color from blue

Hematite is an iron oxide and one of the few gemstones with a metallic luster

Amethyst 6mm Round 15-16 Inch rounds_part_one Sardonyx is sometimes treated toAmethyst 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