This ring by Gem Bazaar can be found in their Etsy shop.

They say, “We first did these Tish rings in blue topaz, vasonite, and amethyst. They were incredibly popular so we ordered them again in those three stones and in two new gemstones, London blue topaz and peridot. This one is London blue topaz, and for those who know their stones, it is a bolder stronger blue than regular blue topaz. It is also more valuable, and it’s easy to see why up close – it is a really blue blue and looks perfect in this ring. The setting is uber simple and classy and the London blue topaz is a cabochon of 10mm by 8mm. The metal is .925 sterling silver with one micron of 18k gold vermeil, so the gold should last. And the ring is 11g so it is lovely and solid, and wonderfully comfortable to wear. You could also wear two of these rings together, which looks spectacular. We also have this ring available in peridot (green) that you can pair it with.”

This is priced at USD$206.11 (they are based in the UK and this is a conversion…)