Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. Mode… Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. Modernize your look with this of-the-moment designer style from the "Diamonds by the Inch" collection. The 15" choker shimmers with .13 ct. t.w. round brilliant-cut diamond flower stations on a classic rolo chain with a 3" extender that's perfect for layering. Finely crafted in polished 18kt white gold. Made in Italy. Lobster clasp, Roberto Coin diamond choker necklace.