Citrine 4mm Cube Table Cut - 15-16 Inch Purple Sardonyx Dumortierite is an aluminum borosilicate

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

According to Norse legend

however it does exhibit a lustrous sheen referred to as “opalescence

Kunzite is prone to fading in direct sunlight

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

Citrine 4mm Cube Table Cut - 15-16 Inch Purple Sardonyx Dumortierite is an aluminum borosilicateCitrine is a transparent Quartz, ranging in color from pale yellow to golden yellow, honey or brown, giving it a similar appearance to Topaz. It may also contain rainbow to colored or sparkling inclusions. The name comes from the French word for lemon, citron. It was a prized gem in Greece as far back as 300 BCE.