About Us

Established in 2009, NGTC (HK) is a lab which has passed the accreditation of CNAS and it’s been designated for the diamond, gemstone and precious metal testing laboratory.


National Gemstone Testing Center (referred to as the "NGTC") is a national level jewelry and gemstone laboratory and directly under the National Gems & Jewelry Technology Administrative Center.

Testing Service

Diamond Grading

Identification of Colored Gemstones

Feicui (Jadeite) Identification

Diamond Identification

Diamond Laser Inscription Service

Precious Metal Jewelry Testing

Price List

Contact Us

Unit 702, Guardforce Centre, 3 Hok Yuen Street East, Hung Hom, Kowloon, Hong Kong, China

(MTR Hung Hom Station → Minibus no.26 OR MTR Whampoa Station Exit A + 10mins walking)

+ 852 2121 8517
+ 852 3691 8599

For enquiries and sample delivery arrangements, please contact Ms. Fong at sharon.fong@ngtchk.com

Opening Hours:
Monday to Friday 9:30 am - 6:00 pm
Headquarters Address:
22/F., Block C, World Trade Centre, No. 36 North Third Ring Road, East Dongcheng District, Beijing, CHINA
Headquarters Telephone:
+ 86 10 58276000
NGTC Headquarters Website:

Recruitment Information: