Is it risky to do diamond appraisal in Beijing National Inspection Center? I asked if I should leave the things with them for three days before I can issue a certificate. What is the most authoritative place in Beijing? Actually, I personally think you should have been cheated by the store. Did I show you the national inspection number on the diamond waist when I bought it? I dare not say anything else, but I can assure you that rough diamonds identified by Shanghai National Inspection will be laser numbered if they reach 30 points or more. This number is the same as the national inspection certificate in your hand You can go to that jewelry store and ask to see the laser number, or you can take your diamonds to the National Inspection Center of the Diamond Exchange on the left side of the intersection of Pudong Road in century avenue for re-inspection. The national inspection will not produce si, only si 1 or si2. Impurities or inclusions in si and Si diamonds can only be seen with naked eyes under a magnifying glass of 10 times. P-grade diamonds can't reach gem-grade diamonds at all, and are generally used in industry. Besides, P-class drills can easily see impurities with naked eyes.

I suggest you find a magnifying glass of 20 times to see if there is a corresponding number on the diamond waist.

If the numbers are the same, you can ask the national inspection center to identify and open the L/C (it is possible that the results of the two national inspections are different, and you can re-examine them for free), and then go to the store to return the goods.

If there is no number or the number is wrong, you can go directly to the store and ask for a statement.

I want to despise a guy upstairs. Who says there is no such thing as p 1? Don't pretend you don't understand, P level is divided into three levels: p 1p2p3!