Ruby can be in any color of red. It is found in rosy, black and skyline colors also. It is the second hardest mineral known to exist, surpassed only by diamond.
It is considered to be of superior quality if; It spreads out red rays in the early morning sun, If immersed in milk 100 times its weight and red rays breakout in the milk, Throws out the glow of the sun in the darkness, If rubbed on a stone the stone shows signs of rubbing and the ruby does not lose its weight in this process.
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