Historically, red ruby jewelry was derived from deposits in Central and Southeast Asia.
The major ancient sources of rubies were Afghanistan, Thailand, Cambodia, and Sri Lanka. Burmese rubies are the most coveted and expensive because their high chromium content imparts a lush, deep crimson color to these precious stones.
India, Vietnam, Japan, and even Tanzania and Madagascar also have important ruby deposits. The dramatic, jungle-strewn landscape of Luc Yen in northern Vietnam has yielded many high-quality rubies. The Madagascan rubies vary widely in color, and the rubies of northern Macedonia in Europe feature a light, raspberry shade that is highly prized.