The largest round diamond in auction history will feature in Sotheby’s Magnificent Jewels sale in New York next month, carrying a price estimate of up to $6.2 million.

The 110.92-carat, L-color, faint brown, VS1-clarity loose diamond (pictured, right) holds a Gemological Institute of America (GIA) report showing it has excellent polish, cut and symmetry, Sotheby’s said Thursday. Its low estimate of $4.2 million would translate to $37,865 per carat, while the high estimate works out to $55,896 per carat.

However, the top lot of the auction is expected to be an emerald-cut, 5.69-carat, fancy vivid blue, VVS1-clarity diamond ring (left) with an estimated selling price of $12 million to $15 million, or up to $2.6 million per carat. The diamond may have the potential for a cutter to make it internally flawless, the auction house pointed out.

“We’re thrilled to present supreme examples of the world’s most sought-after jewels and gemstones this season,” said Gary Schuler, chairman of Sotheby’s jewelry division for the Americas. “Greatly admired for their rarity, these are gems that are enthusiastically pursued by collectors and connoisseurs.”

Other lots at the December 5 auction will include a 15.01-carat ruby and diamond ring, estimated at $2.5 million to $3.5 million; a cut-cornered rectangular mixed-cut, 5.24-carat, fancy intense orangy-pink, VS2-clarity diamond ring, with a price tag of $1.8 million to $2.2 million; and an oval-shaped, 14.01-carat, D-color, VVS1-clarity diamond ring carrying an estimate of $1.5 million to $2.5 million.