Ordinary consumers can directly go to domestic authoritative appraisal institutions to re-examine diamonds, such as NGTC, NGTC and GIC. These quality inspection departments can generally be found in provincial capitals, and local jewelry stores can be found or inquired through maps.
GIA and American Gemological Institute are the most authoritative diamond appraisal institutions in the world. According to GIA official website diamond appraisal fee price list, the bigger the diamond, the higher the appraisal fee. GIA charges more for diamond appraisal than other institutions, but as an internationally recognized authoritative certificate, the results of GIA certificate appraisal are more recognized by people inside and outside the industry.