I have good success selling French designer Biche de Bere necklaces on eBay. Her jewelry is original and quite unique. Many of her pieces have a lovely modernist look. I have been actively looking for Biche de bere necklaces, since my first find at a garage sale: 2 years ago I found 2 necklaces for 5 euros each and both sold for close to 40$ buy now very quickly.
This one was a delightful find. I didn't find it at a yard sale but on the French equivalent of Craigslist. This Fab Modernist Atomic 50's Style Biche de Bere Necklace Silver Tone and Red cost me 25 euros (about $34) and I sold it for $70.