Black spots are invisible to VS2 diamonds, and absolutely invisible to the naked eye. Diamonds with black spots visible to the naked eye should be SI2 or SI3. Your GIA certificate was issued in Hong Kong, that is, your diamond was issued by an ordinary diamond appraisal institution in Hong Kong, and then the data was sent to the GIA Gemological Institute in the United States. The GIA certificate is directly issued by the United States according to the data provided by Hong Kong, and then the certificate is mailed to Hong Kong, which means that the diamond is tested locally in Hong Kong and the certificate is issued by the United States. The purpose of this is to save the cost of sending diamonds back and forth. GIA is also doing this to save costs. At present, most diamonds in Hong Kong and India are identified in this way, which is why the GIA diamonds you bought will be degraded after the structural inspection by the national inspection, and 90% of the degraded diamonds are like this. Few people know this trade secret, even the diamond dealers in China seldom know it. The certificate issued by the real GIA college in the United States is absolutely very strict and there will be no demotion. GIA certificates issued by local GIA colleges in the United States will not flow into the China market at all. Believe it or not, it's a trade secret.