Sell gold, Sell diamond, Sell watch, Sell sterling flatware, cash for gold,...Diamond Exchange USA in Rockville, MD We buy gold, diamonds and watches. We offer services in Jewelry Brokers & Buyers. We specialize in Jewelry Brokers & Buyers. Our Hours of Operation are: Mon 10:00 AM-06:30 PM, Tue 10:00 AM-06:30 PM, Wed 10:00 AM-06:30 PM, Thu 10:00 AM-06:30 PM, Fri 10:00 AM-06:30 PM, Sat 11:00 AM-05:00 PM We are proud to have the following certifications and affiliations - Chamber of Commerce, Better Business Bureau,. We are happy to serve multilingual customers We accept the following forms of payment: American Express, MasterCard, VISA. We have been proudly serving the Rockville, MD area since 1992.