Hong Kong gem association director, gemstone identification expert ZhouGuJiang sir, to the diamond cut deviation and price effect of content detailed elaboration, only know how to cut deviation discount to buy a price and the 4 c match diamond. Mr. ZhouGuJiang according to his many years practical work experience, the diamond parts cut of the deviation, according to a certain proportion to discount to cut the corresponding diamond weight, and press cut diamond weight after the relative market price for diamond price calculation, and the specific cuts the method is as follows:

1, mesa proportion change on price influence (except antique style outside)

Acceptable mesa percentage: 52% 62%

Migration to 50%, prices fell 2%; Migration to 48%, prices fell 5%; When the offset below 48%, according to new cutting estimated weight calculation.

2, crown surface Angle change on the influence of the price

Normal Angle: 33 degrees - 34 degrees

Migration up to 35 degrees minus 1%, migration 36 degrees minus 2%...

3, waist line thickness ratio change on the influence of the price

Migration degree is 1%, down to 2%, migration degree is 4%, down to 2%, more than 7% according to the new cutting estimated weight calculation.

4, pavilion department proportion change on the influence of the price

Normal pavilion department ratio: 42% 44%

Migration degree is 41% down to 2%, 40% down to 4%, less than 38% or more than 50%, according to the new cutting estimated weight calculation.

5, bottom tip size scale change on the influence of the price

Normal bottom tip size: the zero code to small size and medium size.

For example: migration degree greater than medium size, larger, minus 1%, and the like. Or to cut according to estimate the weight computation.

Using the equation calculation: diamond market per carat price * market price weight = diamond value