In addition to the more generic and typically applied gemstones including from diamonds, rubies, sapphires, and emeralds, pearls and opal[24] have also been outlined as precious during the jewellery trade. Up on the discoveries of bulk amethyst in Brazil in the nineteenth century, amethyst was viewed as a "precious stone" https://planetary-gemstones57913.blog2freedom.com/26836350/the-smart-trick-of-diamond-gemstone-benefits-that-nobody-is-discussing