The earliest metallic money did not consist of coins, but of unminted metal in the form of rings and other ornaments or of weapons, which were used for thousands of years by the Egyptian, Chaldean and Assyrian empires. Metals were well suited to represent wealth, owing to their great commodity value per unit weight or volume, and their durability, divisibility and rarity. The best metals for coinage are gold, silver, platinum, copper, tin, nickel, aluminum, zinc, iron, and their alloys; certain alloys of gold, silver, copper and nickel have the best combination of the required qualities.