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+ By Pang Shi-Zhen
Prices of rubies are primarily determined by color. The brightest and most valuable "red" called pigeon blood-red, commands a huge 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 rutile inclusions may indicate that the stone has been treated. Cut and carat (weight) also determine the price.
Tags: mineral de color rojo sangre, rubi sem inclusões, pres delos rubi de piedra rojo.