An internally “flawless” 100-carat diamond was on show Monday in Dubai ahead of being sold at auction next month by Sotheby’s.

The stone, which was discovered a decade ago in the De Beers mines of South Africa, will go under the hammer at a “Magnificent Jewels” sale in New York in April, the auction house said.

One of five diamonds weighing more than 100 carats that have surfaced on the market over the past 25 years, the jewel’s estimated sale price is between $19-25 million, according to Sotheby’s.

The auction house describes it as the “ultimate emerald-cut diamond, weighing 100.20 carats, D colour, internally flawless” and “unlike any diamond offered at auction before”.

Frank Everett, Sotheby’s VP of sales for jewelry said the diamond could be worn as “a pendant on a necklace, or a cuff bracelet or a ring” although someone might buy it “to admire it just as an object in its own right”.