Diamonds are by-far the most popular precious stones. While they come in a variety of shapes and sizes, they are ultimately judges by the four C's: cut, color, clarity and carat.
Emeralds are a rare variety of the mineral beryl. They are green in color because of their high chromium content.
Sapphires are one of the hardest stones on the planet; only diamonds surpass them in hardness.
The cost of a ruby is primarily decided by its color. The brightest and best red ruby is known as the "Pigeon Blood Red".
5. Red Coral
Red coral is often referred to as the "garden of the sea". Initially, it was thought to be a plant but later scientist discovered that these stones actually contain living animals called polyps.