When I see interesting cufflinks for a good price I usually get them. A few I've sold on ebay in the past went over $500. particularly ones made by Georg Jensen. One pair I paid $35. for sold for around $1100. They were made with 18k white gold and black onyx with small square rubies mounted in the center. They had a French 18k gold hallmarks and were signed Ghiso, which was a somewhat high-end jeweler in the first part of the 20th century.