True diamonds were known in Asia at least as far back as 900 B.C. India was the homeland of the gem for many years. The best stones in the sixteenth century were those cut in Hyderabad, India, in the famed city of Golconda. Rich findings were made about 1720 in Brazil; in Borneo in 1738; elsewhere, diamonds were discovered in less significant amounts. But by far the richest hoards were unearthed in 1867 in South Africa, which is still the world’s greatest source of diamonds. Although the lozenge is the characteristic shape of its crystal surface, the rough diamond stone is found in many shapes and cut into great variety. Because of the tears that the great tragic actress Sarah Bernhardt wrung from the audiences at his melodramas, Victor Hugo presented her with a tear-shaped diamond. Among the many literary references to the diamond, the Elizabethan playwrights were particularly fond of the expression “diamond cut diamond”, meaning in that aristocratic age, when great man matched with great. In the more democratic nineteenth century, particularly with regard to those most democratic of spirits, the pioneers—such as the Americans opening up the West—it became popular to speak of an uncouth, unpolished but fundamentally fine fellow as “a diamond in the rough.” Lovers at all times have linked this most brilliant of stones with their fair one’s sparkling eyes. One said that, wherever he went in the world, he found only his beloved: If to far India’s coast we sail, Thy eyes are seen as diamonds bright, Thy breath is Amric’s spicy gale, Thy skin is ivory’s soft white. There are several sayings which, though they refer to the diamond, by indirection speak of mankind. Thus there is a warning to the person who is heedless of dress or decor, or of the furnishing of office or home, in the remark: “A fine diamond may be ill set.” There is, on the other hand, a challenge to pretense, or perhaps a warning to a person about to select an employee—or a mate—in the Chinese proverb: “A diamond with a flaw is better than a perfect pebble.” _Ruby_ The ruby is a variety of corundum. The Sanskrit word _kuruvinda_ was limited to the ruby, but we today use the word corundum to mean any form of aluminum oxide, chemically Al₂O₃. Corundum is next in hardness (though far inferior) to the diamond, and a hard granular form of it is used in grinding and polishing. In its pure, transparent form it is, according to its color, the ruby, the sapphire, the Oriental amethyst, or the Oriental topaz. The Latin word _ruber_ means red, and the crystalline corundum that is a ruby takes shades from pale rose-pink to a deep crimson that borders on the purple. The color is determined by the nature of the oxide, and the gem sometimes has a light silken sheen. A flawless deep red ruby is one of the rarest and most costly of gems.