A sightholder is a company on the Diamond Trading Company’s (DTC) list of authorized bulk purchasers of rough diamonds. DTC is controlled by the De Beers Group, the single largest producer and purveyor of rough diamonds in the world. In May 2006, DTC released a list of the 93 sightholders on its website. ([1])
Eurostar Diamonds International ([2]) is one of the world’s largest sightholder.

References

• Diamonds, Diamond Rings and Diamond Jewelry From Mall Diamonds.com Mall Diamonds is the leading online retailer of certified diamonds, fine jewelry, and diamond rings. We offer gorgeous diamond rings, diamond bracelets,
• Resource Investor - Sections - Diamonds Reporting and analysis of the lucrative precious gem business.
• A Diamond Is Forever | The Diamond Source A Diamond Is Forever is the world's leading diamond information and referral resource. Combining promotion with education, we help you choose or design
• Diamonds Engagement Rings Diamond Jewelry and News Abazias Diamonds offers diamonds, engagement rings, jewelry, education and news for diamonds and jewelry.
• Diamonds.net - Home Page Welcome to Diamonds.net - home of RapNet® Diamond Trading Network, INDEX® - Internet Diamond Exchange, Rapaport Diamond Price Sheets, and Rapaport News
• Engagement Rings, Wedding Rings, Diamond Rings and Diamond Jewelry Diamond engagement rings and wedding bands in your choice of platinum, white gold and yellow gold settings plus diamond pendants, earrings and bracelets.
• Loose Diamonds | AGS and GIA Certified Loose Diamonds at J.R.Dunn Loose Diamond Search; Huge Selection of Certified Loose Diamonds at great prices. Secure Site – Free Shipping.
• Diamonds: Diamond Source of Virginia Safe and easy way to purchase loose diamonds, diamond rings and diamond jewelry. Diamond Source of Virginia is the premier source of loose diamonds and
• DIAMONDS AND ENGAGEMENT RINGS .com - ENGAGEMENT RING Antique Diamonds and Diamond Engagement Rings Wholesale. All the latest styles in diamond, antique, platinum, three stone, and diamond rings all at 50%-70% below
• Diamonds FAQ Information to help shoppers select and buy diamonds, includes articles on diamond grades and diamond quality.
• The Diamonds The Diamonds were a clean-cut white vocal group that had sixteen hits between 1956 and 1961, ten which were covers of songs sung by black R&B artists