different types of precious stones
Stones are normally classified into two categories, precious stones and semi-precious stones. The value of a stone is gauged on these types. Many collectors prefer the rare to the beautiful. The precious stones are the emeralds, diamonds, sapphires, and rubies.he most popular of these are zircon, opal, amethyst, turquoise, aquamarine, jade, coral, garnet, and malachite. The different colors and varieties of the semi-precious stones make them very valuable to the jewelry industry.