Ruby / Corundum:
Ruby / Corundum is a crystalline form of aluminum oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen. Because of corundum's hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral.
Gold(14K) A coating of gold is deposited on the item using the galvanic method or IP process. It is mixed with other metals, usually silver or copper, to make it less expensive, harder, and longer lasting while preserving the brilliance of pure gold. 14k gold is 14/24 of pure gold, which is approximately 58.3% pure gold.