Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. From… Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. From the "Navarra" collection, these link-style hoop earrings shine bright with .29 ct. t.w. round brilliant-cut diamonds in high-polished 18kt yellow gold. Length is 1/2". Hinged post, Roberto Coin diamond-link hoop earrings.