The De Beers Centenary Diamond – 273.85 ct.

This is a rare and extremely beautiful one-of-a-kind Diamond. It’s the Largest D-Flawless Diamond ever discovered. It a phenomenal addition to the World’s Natural Wonders. The De Beers Centenary Diamond is truly one of the most Amazing Famous Diamonds ever!

Gemological Info:

  • Weight: 273.85 ct.
  • Shape/Cut: Modified Heart-Shaped Brilliant Cut
  • Color: D
  • Clarity: FL
  • Measurements: 50.50 x 39.90 x 24.55 mm
  • Uncut Rough Weight: 599.00 ct.

Mine Origin: De Beers Premier Diamond Mine (Now Cullinan Mine) in South Africa

Cutter: Gabi Tolkowsky w/ Jim Nash, Geoff Woolett and Dawie du Plessis

Current Owner: Unknown (Possibly De Beers)

Last Sold By: De Beers Group (If Sold)

Price Sold For: Unknown (Insured at over $100 million in 1991)


  • Mined at the De Beers Premier Diamond Mine in South Africa on July 17, 1986
    • Set Record for the 3rd Largest rough diamond ever discovered at the Premier Diamond Mine (599 ct.)
  • Rough unveiled at the De Beers Consolidated Mines’ Centennial Celebration on May 11, 1988
    • Named The Centenary Diamond
  • Master Cutter, Gabi Tolkowsky, hired to head a team of Master Cutters and Specialists (including Jim Nash, Geoff Woolett, and Dawie du Plessis)
    • Cutting Completed in February 1991
      • Set Record for the Third Largest “Top-Color” Diamond in the World (273.85 ct.)
      • Set Record for the Largest D-Flawless Diamond in the World (273.85 ct.)
  • Unveiled in May 1991
  • Lent to the Tower of London
  • Possibly sold by De Beers – whereabouts unknown

Gabi Tolkowsky is examining the Centenary Diamond with a jeweler’s loupe. (Photo from