- Gemstone Korea Co.,Ltd
- #202,327,Teheran-ro,Gangnam-gu,Seoul,Republic of Korea (ZIP code) 06150
- Tel: +82-2-557-0010
- Gemstone (HK) Co,,Ltd
- Flat/Rm 1810 18F. Ceo tower 77 Wing Hong Street Cheung Sha Wan HK
- Tel: +852-2370-2658
- Gemstone (SH) Co,,Ltd
- 11F, Building 10, Lane 2777, Jinxiu East Road, Pudong New Area, Shanghai (ZIP Code) 201206
- Tel: +86-21-3188-5088
- Gemstone (SZ) Co., Ltd
- #2501, Building A, Dachong Business Center, Nanshan District, Shenzhen, Guangdong, China (ZIP Code) 518053
- Tel: (Direct) +86-755-8860-1162