About
Diamond Exchange USA is a premier coin and precious metals dealer in Columbia, MD with over 25 years of expertise in numismatics, diamonds, and fine jewelry serving the Maryland, Virginia, and Washington DC area. Specializing in GIA and IGI certified diamonds, coins & bullion, estate jewelry, and luxury Swiss watches, they offer personalized service and attention to detail for buyers and sellers seeking high-quality precious metals and gemstones. Let their experienced team guide you through purchasing or selling coins, diamonds, and fine jewelry with professional expertise and trusted service.