Hong Kong has a simple and free business system and it does not enforce a compulsory grading certification for jewellery. If it does not come with a certificate and if in doubt you may request the retailer to refer you to or to submit the diamond to a reliable and accredited laboratory for a grading report. You may request a same day service if needed, be sure to ask for a quotation for grading charges beforehand.
In Hong Kong, DFHK and its subsidiary, NGTC(HK), provides diamond and jewellery grading as small as 20 points. Many international brands present in Hong Kong, such as Gemological Institute of America (GIA), International Gemological Institute (IGI) or Diamond High Council (HRD).
All diamond grading will go thru an authenticity check if it is a natural untreated diamond before proceeding with the quality grading. A report number may be laser inscribed on the girdle of the diamond. Matching of the diamond with the report becomes easy; consumer may easily verify the information on-line. With this the consumer can have an added assurance on the quality of diamond.
Standard Methods for Testing Diamond for Hong Kong
The Hong Kong Accreditation Service (HKAS) under the Hong Kong SAR Government evaluate laboratories’ technical capabilities in accordance with the ISO / IEC 17025 standard, and issue accreditation to qualified laboratories. Accredited laboratories perform the follow seven test stipulated in the "Standard Methods for testing diamond for Hong Kong” established in 2008 by Gemological Association of Hong Kong (GAHK).
1. Authenticity Identification
2. Measurement of Weight
3. Colour Grading
4. Testing for Fluorescence
5. Clarity Grading
6. Shape & Cutting Style, Proportion and Finish Grading
7. Cut Grading of Round Brilliant Diamond