Instructions
Acquaint yourself with all of the diamond's supporting documentation. Not all rough diamonds are of gem quality; those with too many imperfections are destined for industrial use. If you have any initial reports stating that your diamond has passed a quality inspection, with details such as its weight in carats, then you will be in a stronger bargaining position.
Search the Yellow Pages under headings such as "Diamond Cutters" or "Diamond Buyers" for dealers in your region. Look for well-established businesses, then make contact to find out if they would be interested in viewing a small number of uncut diamonds.
Take to the meeting any supporting documentation such as invoices and quality reports. A clear provenance will increase its value. If you cannot strike a deal with a local dealer, move onto Step 4.
Go online and type the words "diamond bourse" plus the name of your state into your search engine. A diamond bourse is a trading center or market -- the largest in the U.S. being the New York Diamond Dealers Club (DDC). Once you have found your nearest bourse, phone or email them to ask about submitting rough diamonds for sale. Ideally, this will result in a situation where several dealers will compete for your goods.