The assortment includes a white gold and diamond Cartier ring set with the Sunrise Ruby, the world’s most dear non-diamond gemstone, which Horten bought for $30.4m (£24.5m) at auction eight years in the past. The 25.59-carat uncommon “pigeon’s blood” Myanmar ruby is described by the Swiss Gemmological Institute as a “unique treasure of nature” and is predicted to promote for $15m-$20m. At Forbes Vetted, we’ve researched and written a wide catalog of jewelry stories that make it straightforward to pick out the proper piece for any event; we’ve penned buying guides on everything from wedding bands to bracelets for men.…