Even though the De Beers Centenary Diamond was discovered in the Premier Mine in South Africa in 1986, its existence was announced two years later at the 100th anniversary of De Beers in Kimberley. This is how it got its name — Centenary.

Weighing 599 carats, it was one of the world's largest top-colour diamonds. The Centenary was then cut down into a heart-shaped gem of 273.85 carats with 247 perfectly aligned facets. The GIA certified the diamond's colour as D — the highest rating for colourless diamonds — and internally and externally flawless in clarity.

At the time of its unveiling in 1991, it was the largest known colourless modern-cut diamond. The Centenary has never been valuated, but it was insured for USD 100 million before it was put on display in 1991. No one knows who owns the diamond and therefore, its current location remains a mystery.

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