The intricate play of colours on the opals is sure to capture peoples attention with their blues and greens. These earrings embody elegance and sophistication, making them the perfect complement to any outfit. The sterling silver bezel setting offers a classic look that never goes out of style. A triplet opal consist of three layers, a black backing, a paper-thin slice of opal in the middle and a clear glass, quartz, or plastic capping in the shape of a dome on the top. The slice of opal in a triplet is usually extremely thin (paper-thin) so the clear capping serves to give the stone a cabochon top.