Silver Turquoise Marquise Oval Centre Twisted Ring. R752. This feminine Sterling Silver, Turquoise and Marcasite ring features an oval cabochon of Turquoise stone, the December birthstone. The striking stone is surrounded by glittering Marcasite and framed by a beaded silver design. 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. Silver Whitby Jet Marquise Oval Centre Twisted Ring