What properties make a gemstone a diamond?

Answer 1

Clear and Bright

Another Answer

Clarity may be the number one characteristic that separates that 20% of diamonds mined as gemstones from the 80% that are cloudy, and used as industrial diamonds.

Answer 2

A diamond is a naturally occurring mineral composed of carbon atoms arranged in a specific crystal structure called diamond cubic. It is the hardest known natural material, scoring a 10 on the Mohs scale of mineral hardness, and has exceptional brilliance and fire due to its high refractive index. Diamonds are typically colorless, but can also occur in various colors based on impurities present in the crystal lattice.

Answer 3

a diamond is an ultra high pressure allotrope of carbon, within the structure the carbon atoms bond with 4 other carbon atoms in a tetrahedral structure creating an incredibly hard substance

Answer 4

clear and brightness