| Site | Category |
| Heritage Auction Galleries | Auctions |
| Hull Systems | Credit Institutions |
| Hearts On Fire Co. | Diamond Cutters |
| Henry Daussi | Diamond Cutters |
| HARDCARBON | Diamond Dealers - Wholesalers |
| HBS Diamonds | Diamond Dealers - Wholesalers |
| HeartsandArrows.com | Diamond Dealers - Wholesalers |
| House of Onyx, Inc. | Diamond Dealers - Wholesalers |
| HRA DIAMONDS | Diamond Dealers - Wholesalers |
| Hull Systems | Diamond Dealers - Wholesalers |
| Hope USA Corp | Diamond Manufacturers |
| Hope USA Corporation | Diamond Manufacturers |
| HS Diamonds | Diamond Manufacturers |
| Harold Weinstein LTD | Gemological Labs |
| Hoffs Rock Shop | Gemstone Dealers |
| House of Onyx, Inc. | Gemstone Dealers |
| house of onyx, inc. | Gemstone Dealers |
| house of onyx, inc. | Gemstone Dealers |
| Hubert Gem Designs | Gemstone Dealers |
| HARIKRISHNA EXPORTS | Jewelry Manufacturers |
| Harold Freeman Jewelery Mfg. Co., Inc | Jewelry Manufacturers |
| Hathir Amani | Jewelry Manufacturers |
| Hawaiian Jewelry Shop | Jewelry Manufacturers |
| Heavy Stone Rings | Jewelry Manufacturers |
| Honora Designs | Jewelry Manufacturers |
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