Ruby Rough Stone
A ruby is a pink to blood-red colored , a variety of the (). Other varieties of gem-quality corundum are called . Ruby is one of the traditional , together with , , , and . They word ruby comes from ruber, for red. The color of a ruby is due to the element .The quality of a ruby is determined by its color, cut, and clarity, which, along with weight, affect its value. The brightest and most valuable shade of red called blood-red or pigeon blood, commands a large premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like may indicate that the stone has been treated. Ruby is the traditional for July and is usually more than , although some garnets have a similar pinkish hue to most rubies. The world"s most expensive ruby is the .