Silver Turquoise Marcasite Square Ring. R751. This stunning ring boasts a delicate square shaped cabochon of Turquoise semi precious gemstone. The stone is placed within an exquisite sterling silver setting embellished by dazzling marcasite stones, bringing a sophisticated sparkle to the piece. The ring is completed by a classic sterling silver band. All our Turquoise jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Turquoise stone into these stunning pieces of jewellery. You can find other matching Turquoise jewellery and other Turquoise rings on our website. Sterling Silver and Whitby Jet.