Precious stones are those which, because of their beauty, hardness, and rarity, are prized for use in ornamentation, especially in jewelry. The diamond, ruby, sapphire, and emerald are the only stones which are, strictly speaking, entitled to be called "precious" in this sense; but the opal, on account of its beauty, is often classed with the precious stones, as is also the pearl, which is really not a stone, but a secretion of a shellfish.
Bloodstone or Heliotrope
Lapis-lazuli or Lazuli
Rock Crystal or Mountain Crystal
From The Standard Dictionary of Facts, The Frontier Press Company, Buffalo, N.Y., 1923.
“He is gracious; he shows mercy, not because we deserve mercy, but because he delights in mercy.”
–Thomas Watson, A Divine Cordial