In the ancient world there was only one source of diamonds:India. Bombay remains today one of the world's great diamond cutting centers (along with New York, Tel Aviv, and Antwerp). Over 800,000 cutters are employed in the city of Bombay alone; cutting 90% of the world's diamonds. The ancient Greeks believed diamonds were tears of the gods; and it is from the Greek word adamas, "untameable" or "unconquerable", referring to its hardness, that the word "diamond" is derived. The ancient Romans believed that diamonds were splinters of fallen stars. In western culture, diamonds are the traditional emblem of fearlessness and virtue. Diamonds occur in a variety of colors - steel, white, blue, yellow, orange, red, green, pink, brown and black. The most common diamonds, and arguably the most sought after (though not the rarest) are pure and colorless.