What Is the Biggest Sapphire in the World
The largest known sapphire is the Star of Adam, a 1404.49-carat blue star sapphire, which is recognized by the Guinness World Records as the biggest star sapphire ever found. It was mined in Ratnapura, Sri Lanka, and sold in 2015 for a reported $100 million to a private buyer. The gem is a Ceylon sapphire with a vivid blue color and a prominent six-rayed star caused by rutile silk inclusions. Its weight, clarity, and asterism make it the benchmark for size and quality in the sapphire market. The sale was documented by major auction houses and reported by industry outlets, including a detailed write-up from Forbes on record-breaking gems and high-value collector sales.
Sapphire is a corundum mineral, and only red corundum is classified as ruby. The Star of Adam's size and star effect place it at the top of the global sapphire ranking, surpassing other famous stones such as the Star of India and the Black Star of Queensland. Sri Lanka remains one of the primary sources for high-quality sapphires, especially large, heat-treated blue stones. The gem's current private ownership means it rarely appears at public auctions, but its existence is verified by gemological reports and Guinness certification. For background on corundum, sapphire, and ruby classifications, see the authoritative overview from the Gemological Institute of America.
Key Facts About the Star of Adam
The Star of Adam weighs 1404.49 carats, equivalent to roughly 280.9 grams, making it the heaviest sapphire ever recorded. It was discovered in the Ratnapura district of Sri Lanka, a region known as the "Gem Capital of Sri Lanka" and a historic source of fine sapphires. The stone exhibits a six-rayed asterism, or star, caused by aligned needle-like rutile inclusions reflecting light in a symmetrical pattern. Its color is described as vivid blue with a strong saturation, typical of premium Ceylon sapphires. The gem was certified by a leading laboratory, and its sale price of around $100 million was reported by auction houses and industry analysts, including coverage from Sotheby's on landmark gemstone transactions.
The name "Star of Adam" references a local belief that the stone originated from Adam's Peak, a sacred mountain in Sri Lanka. The sapphire is currently held in a private collection, and its exact location is not publicly disclosed. The Guinness World Records listing confirms it as the largest star sapphire, while the broader sapphire market uses carat weight, color, clarity, and origin to rank stones. Large Ceylon sapphires of this size are exceptionally rare, and the Star of Adam is considered a museum-quality specimen. For a deeper look at how sapphire prices are driven by size and origin, a trusted industry source is the International Colored Gemstone Association.
Other Large Sapphires and How the Star of Adam Compares
Other famous large sapphires include the Star of India, a 563-carat star sapphire at the American Museum of Natural History, and the Black Star of Queensland, a 733-carat black star sapphire. The Star of Adam is more than double the weight of the Star of India and over twice the size of the Black Star of Queensland, making it the clear leader in the category of largest sapphires. The Blue Giant of the Orient, a 466-carat blue sapphire, is another historically significant stone, but it is smaller than the Star of Adam. These comparisons highlight how exceptional the 1404-carat Sri Lankan sapphire is in terms of sheer mass and market value.
The global sapphire market is driven by demand for fine blue stones, especially those over 100 carats,