| Site | Category |
| Alldiamonds.biz | Advertising Agencies |
| A.DeMello Gemological Laboratory | Appraisers |
| A.DeMello Gemological Laboratory | Appraisers |
| A.DeMello Gemological Laboratory | Appraisers |
| AIG Laboratories | Appraisers |
| A&A Auction Gallery | Auctions |
| ACN TV | Auctions |
| Antiquorum On Line | Auctions |
| Anacom Merchant Services | Credit Institutions |
| Adesh International | Diamond Cutters |
| Alpha Inc. | Diamond Cutters |
| American Institute Diamond Cutting, Inc. | Diamond Cutters |
| Aura International Inc. | Diamond Cutters |
| A Fishman & Son | Diamond Dealers - Wholesalers |
| A. Schwartz & Sons | Diamond Dealers - Wholesalers |
| AAA DIAMOND DOSSIER CUTTING | Diamond Dealers - Wholesalers |
| Abazias | Diamond Dealers - Wholesalers |
| Abazias | Diamond Dealers - Wholesalers |
| Absolute Diamond Exchange | Diamond Dealers - Wholesalers |
| AD AMANTES S.r.l | Diamond Dealers - Wholesalers |
| Adamas India | Diamond Dealers - Wholesalers |
| Adamaunt | Diamond Dealers - Wholesalers |
| Adesh International | Diamond Dealers - Wholesalers |
| Adtec (PTY) LTD | Diamond Dealers - Wholesalers |
| Ady Legziel Export | Diamond Dealers - Wholesalers |
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