Scotsman Coin and Jewelry

Scotsman Coin and Jewelry buys and sells rare coins, precious metals, fine jewelry and diamonds. Its stock includes U.S. gold coins such as an 1902 $2.50 gold piece, Spanish colonial cob coins from the mid-1700s, and vintage-style jewelry like an 18K white gold emerald and diamond cocktail ring. The company also runs its own coin auctions.

Auctions are held in person at St. Louis-area venues, including a hotel near the airport and a convention center in St. Charles. Winning bids carry an 18 percent buyers' premium on top of the hammer price, and payment is in U.S. funds by PayPal, major credit cards up to $25,000, bank wire, or approved checks and money orders. The shop on Olive Boulevard in St. Louis is open weekdays and Saturday mornings, and it also buys gold, silver and jewelry from people who want to sell.