Generally speaking, natural South African diamonds are indeed natural diamonds, but consumers can't fully believe what he says when they consume such products. This kind of products have certificates issued by relevant state departments. One product corresponds to one certificate.

The following is a common certificate inquiry website in China, hoping to help you.

1 The Jewelry and Jade Jewelry Management Center of the Ministry of Land and Resources, referred to as "National Inspection" for short, is the most authoritative testing department in China and generally inquires about finished products and diamonds.

/ngtc/mainindex.do

American Gemological Institute generally detects loose diamonds.

http://www2.gia.edu/reportcheck/index.cfm