Aside from the more generic and typically utilised gemstones for instance from diamonds, rubies, sapphires, and emeralds, pearls and opal[24] have also been described as precious during the jewellery trade. Up to the discoveries of bulk amethyst in Brazil in the nineteenth century, amethyst was viewed as a "precious stone" https://bestplacetobuygemstones68023.ja-blog.com/26827116/the-best-side-of-certified-gemstones