Since the ancient world, the color purple has been tied to kings and queens, prized for its bold hues. The rarity of the color gave it its royal reputation; the only way to produce purple dye was from the mucus of a rare sea snail. Which was worth its weight in gold, and it took about 250.000 of these snails to produce one ounce of purple dye.
Amethyst was one of the most precious gemstones because supply was also limited throughout history. Amethyst's colors range from light to dark purple and owes its violet color to irradiation, and the transparent deep purple colors are the most highly regarded.
The most profound stones have been set in royal jewelry for centuries, from ancient Egypt to the British crown jewels. According to some scripts, the ancients believed Amethyst kept its wearer clear-headed and sharp in battle and business affairs.