Silicon Valley Diamond & Jewelry Buyers, conveniently located on Sand Hill road in Menlo Park, is an industry leader in the purchasing of diamonds, colored stones, fine jewelry, luxury watches and precious metals. Weather you want to sell an engagement ring in the Bay Area, sell estate jewelry, sell diamonds "loose or mounted", sell gold coins, or jewelry you no longer wear. We evaluate based on purity & weight to determine the value. Should you accept our offer, payment is made immediately.