The terms “precious and “semi-precious” came into origin in the 19 that large deposits of Amethyst were found in Brazil. This discovery correlates to the introduction of these categories as Amethyst, formerly thought of as a valuable stone, was no longer describes as such due to its newly discovered abundance. Historically the term semi-precious stones were reserved for all gemstones that did not include diamonds, emeralds, sapphires, and rubies. These four precious gemstones were traditionally thought to command a higher market value due to their rarity, beauty, and popularity. Today, however, these terms are thought to be inappropriate and misleading because of what they suggest to customers.