Cutting and polishing of investment-grade fancy-color diamonds and gemstones for jewelry houses worldwide
House of Gems Ltd.
Hong Kong · Bangkok · Ramat Gan · Singapore · New YorkNew on Amplifa
About House of Gems
House of Gems was founded in 1986 by Rajesh Sheth and specializes in the sourcing and processing of rough and polished diamonds, in particular investment-grade fancy-color diamonds from Fancy Yellow to Fancy Vivid Yellow. The company sources rough diamonds through auctions and in cooperation with mining companies, and operates its own cutting and polishing capacity; in 1995 House of Gems acquired a polishing factory. Manufacturing uses inclusion-mapping systems, colorimeters and proprietary AI software. Its customers are primarily renowned fine jewelry houses; several of the company's diamonds (including The Amaranthine, The Celeste, The Green Lily) have been honored with a GIA Monograph. The company is a member of the Responsible Jewellery Council and Kimberley Process compliant, and maintains offices in Hong Kong, Bangkok, Ramat Gan (Israel), Singapore and New York.
- Site
- Central, Hong Kong
- Processes
- Diamond Polishing (Rough to Polish), Diamond Cutting, Coloured gemstone cutting/polishing, Diamond Procurement / Trading (Rough and Polished), Diamond sourcing (rough & polished), Diamond cutting and polishing (fancy color diamonds), Gemstone cutting/polishing, Wholesale and retail of gemstones
- Materials
- Fancy Color Diamond (Yellow, Blue, Red, Green, Pink), Diamond (Rough & Polished), Coloured Gemstone, Fancy Color Diamond
- Certificates
- RJC Code of Practices 2019 (Membership), Kimberley Process Compliant, RJC Code of Practices 2019, Kimberley Process
- Founded
- 1986
- Employees
- 14
- Industries
- Fine jewelry/Jewelry Houses, Diamond trading, Investment-grade gemstones
- 01
Rough diamond sourcing (auctions, mining partners)
- 02
Cut planning (inclusion mapping, AI software)
- 03
Cutting
- 04
Polishing
- 05
Quality inspection (colorimeter, GIA certification)
- 06
Wholesale and retail
Materials and processes
Fancy Color Diamond
Investment-grade diamonds in yellow, blue, red, green and pink, cut and polished.
Diamond (Rough & Polished)
Sourcing and trading in rough and polished diamonds.
Coloured Gemstone
Gemstones for cutting, polishing and wholesale/retail.
Locations
Hong Kong
HKBranch/Headquarters of House of Gems Ltd.
- Materials
- Diamond
Bangkok
THColor treatment and polishing and trading company (House of Gems International Co. Ltd.)
- Materials
- Gemstones, Diamond
- Inclusion Mapping System
- Colorimeter
- Proprietary AI Software
Ramat Gan
ILIsrael office (Diamond Exchange Building)
- Materials
- Diamond
Singapore
SGSingapore office
- Materials
- Diamond
New York
USNew York office (580 Fifth Avenue)
- Materials
- Diamond
Building blocks and product range
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Diamond Polishing (Rough to Polish)Surface | – | – | – | – | Diamond, Fancy Color Diamond |
| Diamond CuttingSurface | – | – | – | – | Rough diamond (Rough Diamond) |
| Coloured gemstone cutting/polishingSurface | – | – | – | – | Coloured Gemstone |
| Diamond Procurement / Trading (Rough and Polished)Engineering | – | – | – | – | Diamond |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Inclusion Mapping System | – | – | – | – | – |
| Colorimeter | – | – | – | – | – |
| Proprietary AI Software | House of Gems (in-house) | – | – | – | – |
Additional services
Reference customers
Quality and compliance
House of Gems is a member of the Responsible Jewellery Council (Code of Practices 2019) and Kimberley Process compliant; all diamonds are documented via GIA certificates. Value creation is monitored by means of inclusion mapping, colorimetry and proprietary AI software.
| Evidence | House of Gems Ltd. | House of Gems International Co. Ltd. |
|---|---|---|
| RJC Code of Practices 2019 | ||
| Kimberley Process |
History
- 1986
Founded by Rajesh Sheth
- 1995
House of Gems acquires a polishing factory
- 2007
Hong Kong office established
- 2011
House of Gems International Co. Ltd. registered in Thailand (Bangkok) (December 6, 2011)
- 2012
Israel office established
- 2016
GIA Monograph for Monarch Mirabella; sale of a 4.90ct Fancy Intense Green diamond at Sotheby's
- 2017
Sale of an 8.80ct Fancy Intense Pink diamond at Christie's
- 2018
GIA Monograph for The Amaranthine (1.5ct Fancy Red)
- 2019
GIA Monograph for The Celeste (50ct Fancy Blue)
- 2020
GIA Monograph for The Green Lily (4ct Fancy Intense Green)
- 2022
RJC certification of House of Gems Ltd. (16.02.2022–16.02.2025)
- 2026
House of Gems International Co. Ltd. (Bangkok) becomes an RJC member (August 2026)