See whether you pay attention to quality or quality. If you pay attention to quality, you should choose a higher grade, but the weight of diamonds will drop. If you want to observe the cost performance with the naked eye in practice, you need to buy a medium quality one. Some indicators that affect the naked eye will be higher and some will be lower.

1W can sell Dockwra with a top index of 0.40 (more than 40 points).

The comprehensive index is above 0.50CI, and the price is higher.

You can also bring a 0.60-carat, low-to-middle, cost-effective one.

Or wear this 0.70- 1.00 carat,

Hehe, 1.00 carat, if this price is really estimated ...-! There may be a feeling of broken glass ~

The highest color is D color (100 color), and so on. e、F、G、H、I、J、K、L、M、N ...

The highest definition is FL-IF (Chinese character LC), and so on VVS 1/2, VS 1/2, SI 1/2/3, I 1/2/3 (Chinese character P).

The highest cutting standard GIA is EX (perfect), followed by VG G F, HRD is VG (best), followed by G F, NGTC is excellent (best in national standard), followed by good and bad, AGS certificate is 0 (extreme cutting), followed by 123... 10.

(It is said that the new HRD certificate has added a higher standard than the original VG, but I don't know if it is still a general VG. I won't mention the national inspection. Very general. As for AGS, it is rare in China and belongs to the most severe logging. GIA, combined with 2C standards such as cutting, is not bad)

The weight in 4C is the most important factor affecting the base price, and it is also the exact standard in the world. For carat weight, the bigger the rarer, the better the quality, the rarer. There is a small standard for the weight of diamonds, that is, three decimal places, and every ninth place enters 1. That is, 0.9999 La may be directly labeled as 1.00.

The purity, color and cutting size of the finished product certificate are all reference values and cannot show the real quality. The highest score can only be F-G VVS cut without trace. If the certificate of finished product is higher than this standard, it may be a re-inspection of bare stone. If there is the original rough diamond inspection certificate, the finished product certificate will be customized based on the original certificate. I wonder if there are any extra columns. Think for yourself.

The certificate of rough diamonds is a standard value, but the detection standards in different regions are slightly different. However, the 4C standard of GIA Gemological Institute of the United States is generally adopted as the standard test value in the world, and other testing centers are customized according to 4C standard. GIA is the main standard of gem and diamond pricing in international diamond exchange center.