From the Diamonds by the Inch Collection. Roberto Coin's 18K-yellow-gold necklace features a bezel-set, emerald-cut natural diamond suspended from a fine cable chain. The acclaimed jewelry designer signs each piece with a single ruby placed in a concealed location. Natural diamond, 0.38 tcw Diamond color grade: G-H Diamond clarity grade: SI 18K yellow gold Lobster clasp Made in Italy SIZE Adjustable chain length, 18" Pendant, about 5mm L x 8mm W ABOUT THE BRAND Jewelry designer Roberto Coin founded his eponymous line in 1996, with a strong emphasis on elegance and creative experimentation. Each piece is the result of a long creative process, taking inspiration from cultural influences and nature. Fine Jewelry - Roberto Coin Asset > Roberto Coin > Saks Fifth Avenue > Barneys. Roberto Coin. Color: Yellow Gold.