I don't know if the 2.8 card you mentioned is the main drill 2.8, or the main drill 1.8 card plus broken drill 1 card?

2.8 Card size is not easy to find, and generally the weight close to an integer will be directly made into an integer.

2.8 cards, VS2, G color, 3EX cut, the price is about 280,000 RMB.

I helped you search the spot price for your reference:

2.63 carats, VS2, F color, 3EX cut, table width 60, GIA certificate:1129648109, this model is currently in Hongkong, and the price is (RMB) 3376 19 yuan.

2.62 carats, SI2, color I, 3x cut, platform width 57, GIA certificate:1129103284, currently in Hong Kong, price 136000.

2.7 1 carat, SI2, I color, 3x cutting, platform width 59, IGI certificate: S3B66899, current port price 147000 yuan.

3.0 carats, IF (flawless), E color, 3EX, platform width 56, GIA certificate: 2 145070435, Hong Kong, price: 1.4 million.

These prices are always available.

Relatively speaking, the value of 1 carat diamond is relatively low, generally not exceeding 1 10,000 pieces.

If the answer is not enough, you can ask.

Qq33 1347747, Sina Weibo: I love diamond rings.