The word diamond comes from the Greek word adámas, meaning adamant or unbreakable, and indeed
hardness is one of the qualities that has always made diamonds so valuable. Measured on the Moos hardness
scale, diamonds score a 10, the highest possible rating. Diamonds are also extremely high in luminescence,
the ability to catch the light and sparkle with different colors. Cut and polished to show off their brilliance,
diamonds have a visual appeal like no other stone.