Cullinan IV, a 63.6 ct Asscher-cut diamond cut from the famous 3106.75ct Cullinan diamond - the largest uncut gem-quality diamond ever found - sits at the top of a royal brooch, which was worn by Queen Mary before being passed down to Queen Elizabeth, pic

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Cullinan IV, a 63.6 ct Asscher-cut diamond cut from the famous 3106.75ct Cullinan diamond - the largest uncut gem-quality diamond ever found - sits at the top of a royal brooch, which was worn by Queen Mary before being passed down to Queen Elizabeth, pic

Cullinan IV, a 63.6 ct Asscher-cut diamond cut from the famous 3106.75ct Cullinan diamond - the largest uncut gem-quality diamond ever found - sits at the top of a royal brooch, which was worn by Queen Mary before being passed down to Queen Elizabeth, pictured.

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