It was one of the five traditional cardinal gemstones considered precious above all others, along with diamond, ruby, sapphire, and emerald. Amethyst has been valued as a gemstone for thousands of years.The historical romance around amethyst was derived from both its coveted deep purple color and its rareness.In 1904, a synthetic coal tar dye was developed, reducing the cost of purple dye.Each gastropod produces only a drop of dye, so thousands were required to color fabric, rendering purple fabric very expensive and rare. ![]()
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