RK & Co. is an industry leader in the purchasing of diamonds, jewelry, Rolex watches (as well as other luxury brands like Patek Philippe, Omega, Breitling, Cartier) and precious metals. Whether you are considering selling your jewelry, selling diamonds (loose or mounted), selling an engagement ring, gold coins, bullion, sterling silver flatware, branded and signed jewelry such as Tiffany & Co., Bulgari, Roberto Coin, John Hardy) that you no longer wear - or worse yet you've kept in a safety deposit box, we will make you a competitive offer based on current market value.