If you bought it in an authentic Chow Tai Fook, you don't have the card certificate like that in China, but they have a professional invoice with a detailed description of the products you bought. For example, diamonds are VVS. Relative to size, etc ... gold will show purity.

Because I personally bought my diamond ring at Chow Tai Fook. Go to Chow Tai Fook on Baili Avenue, don't trust the tour guide. There won't be fake Chow Tai Fook on the streets of Hong Kong. They dare not, hehe.