Other than the more generic and usually applied gemstones like from diamonds, rubies, sapphires, and emeralds, pearls and opal[24] have also been outlined as precious while in the jewellery trade. Up on the discoveries of bulk amethyst in Brazil within the nineteenth century, amethyst was deemed a "precious stone" also, https://benefitsofwearinghessonit39483.kylieblog.com/27278909/a-simple-key-for-gemstones-yellow-unveiled