Celtic Circle Turquoise Gemstone Stud Earrings by St Justin of Penzance Pewter Earrings £18.50 This size has sold out, more arriving soon. Celtic Circle Turquoise Gemstone Stud Earrings Pewter disc earrings with Celtic knotwork design and a central gemstone. Come on Sterling silver posts with stainless steel scrolls. The Celts used knot work to decorate many of their artifacts. To them, the intricate patterns woven into spirals and knots symbolised the continuity of life. Diameter: 12mm Supplied in a satin and velvet-lined gift box. The venerable alloy of pewter is made of 92% tin, with copper and antimony to harden it and enhance casting. All of our St Justin Pewter products are LEAD FREE.