The exact origin of the Kohinoor diamond is shrouded in legend and mystery, but it is generally believed to have been mined from the Golconda region in southern India, which was famous for producing large, high-quality diamonds . 6. Steinmetz Pink Diamond Kohinoor Diamond : The Most Expensive Gem The Kohinoor Diamond , a name that resonates with opulence, history, and controversy, is a gem of unparalleled renown. Its journey through time and across empires has rendered it one of the world's most celebrated and disputed gemstones, captivating hearts and minds for centuries. Being well-versed in a diamond 's color, cut, clarity, carat weight, will take you a long way in ensuring you're selecting your perfect diamond . Diamonds are highly valued and expensive gemstones due to their rarity, beauty, durability, and marketing efforts of diamond companies. Learn about the Kohinoor Diamond , a colorless gem of 105 carats with a rich and complex history. Explore its market valuation, cultural implications, and its journey from India to the British Crown.