There still are relative bargains to be found. An unsigned, classic Art Deco diamond-strap bracelet is one of them. “In the 1920s they pumped them out,” Everett says. “You’re paying for the materials, and the quality was quite high.” According to Everett, such a bracelet at auction can usually be had for between $15,000 and $20,000, compared with a contemporary piece with similar materials and carat weight that may sell for as much as $100,000.