Stacked or worn solo, the Signature Revival Gemstone Bar Ring encourages a closer look at the beautiful barrel-cut of its elongated, raised gemstone. Gemstone: Denim Blue (Man-Made). With a lower environmental impact than naturally mined gemstones, our Man-Made stones are a highly durable alternative offering impeccable color consistency and a wider variety of hues. Width : 4mm / 0.16" Height : 5mm / 0.20" Please see here for our size guide.