14.93-carat stone is most expensive piece the auction house’s Hong Kong branch has ever offered.

A fancy vivid pink diamond will formally be the most expensive piece of jewelry Christie’s Hong Kong has ever auctioned when it goes under the hammer at the Magnificent Jewels sale this month.

The 14.93-carat, VVS1-clarity, type IIa stone, known as the Pink Promise, has an estimate of $28 million to $42 million (￥186 million to ￥279 million), according to Christie’s announcement.

It will be one of more than 290 articles in the November 28 auction, though it won’t be the only pink diamond on offer: An 8.80carat, fancy intense pink, VVS1 stone set in a ring is expected to sell for $8.8 million to $12 million (￥55.4 million to ￥79.64 million).

Other lots will include an 8.17-carat pigeon’s blood Burmese ruby ring at an estimated $5.8 million to $8 million (￥38.5 million to 53.1 million), as well as a jadeite-bead and diamond necklace for a projected $7.3 million to $10 million (￥48.5million-￥66.4million).

The two pink diamonds leading the sale “are offered in response to the continued appetite of collectors around the world for pieces of mesmerizing beauty and unsurpassed quality,” stated Vickie Sek, Christie’s deputy chairman and director of jewelry for Asia.

The auction will also feature a collection of jewelry by Hong Kong-based designer Wallace Chan.