First of all, gia is the abbreviation of Gemological Society of America, and it is the first institution to put forward the globally recognized "diamond 4c grading standard system", which is quite authoritative.

Whether the word gra is pronounced with the naked eye or not, many people have a little knowledge. If you have seen diamonds in shopping malls and jewelry stores, and listened to the explanation of the shopping guide, you will know that there is an American jewelry institute, G what A, so it is very likely that you deliberately chose this name to confuse people.

GRA is just a piece of printing paper, because it is forged and has no reference significance. Most of them are found in the relatively low-end products of Mosan diamond in China.