Types of Gemstones
Gemstones are basically minerals / mineral stones which are cut & polished in the most refined form so that they assume the grace of a precious stone. These gemstones are then used to adorn various jewelry.
Major types of gemstones that we have come accross include Diamonds, Sapphire, Emerald, Amethyst, Topaz & Ruby. 
A complete range of precious & semi precious stones can be checked out @ http://www.semi-precious-stone.com.
Semi-precious stones range in price based on size, quality and authenticity. Semi-precious stones are lab treated to enhance color and remove flaws, and these are correspondingly less expensive. For loose semi-precious stones, prices can range from a few US Dollars (USD) to several hundred depending on the size and quality.
Various Colors in which the precious stones are commonly seen include:
Diamonds: White Diamonds, Black Diamonds, Blue Diamonds
Emerald: Green Emerald
Sapphire: Blue Sapphire
Ruby: Red Ruby
Pearls: White Pearls, Peach Pearls, Black Pearls
