Devon Fine Jewelry 303 Franklin Ave, Wyckoff, NJ07481 Located in the center of Wyckoff, Devon Fine Jewelry has been in business for 30 years and in Wyckoff for the past 20…More years. Items sold here range from $25 to $25,000. Devon is known for carrying more than 85 precious colored gemstones, which can be used to make original and unique jewelry. The store also carries gold and sterling silver items. The helpful staff can answer any questions you may have about the merchandise.