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 Gems & Jewelry Testing Co. Ltd. (referred to as the "NGTC") is a national level jewelry and gemstone laboratory .

Testing Service

Diamond Grading

Identification of Colored Gemstones

Feicui (Jadeite) Identification

Diamond Identification

Diamond Laser Inscription Service

Precious Metal Jewelry Testing

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. Kabi Kan or Ms. Ada Yang kabi.kan@ngtchk.com ada.yang@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: