Of the 18 examples in the British Museum collection of the interesting class of rings cut out of a single stone, The collection comprises 169 specimens, 45 of them zircons, fully illustrating the wide range of color to be found in this gem-stone; two of them are of a beautiful sky-blue. The following list gives the number of rings for each mineral species: Corundum 12 Spinel 17 Chrysoberyl 8 Quartz (amethyst, tiger-eye, chrysoprase) 3 Peridot 1 Spodumene 1 Labradorite 1 Beryl 4 Andalusite 1 Tourmaline 20 Opal (precious, fire, black and milk) 10 Zircon 45 Phenacite 5 Enstalite 1 Moonstone 2 Garnet 19 Topaz 8 Cordierite 2 Sphene 1 Turquoise 1 Only three of the rings are set with more than a single stone. Several belonged to the collection of Sir Hans Sloane in 1753, five of them being archers’ thumb-rings, of agate, carnelian, mocha-stone, or jasper. A green jasper ring of this type is thus entered in the Sloane Manuscript catalogue: “A thumb piece for defending it from being hurt by the bowstring, from Turkey.” A remarkable, though decidedly eccentric ring of the _art nouveau_ style of René Lalique shows in the long, irregularly oval bezel, a full-length, nude female figure cut in very high relief out of a bluish rock-crystal; set at one side about the middle of the figure is a round pearl, apparently of immense proportions as compared with those of the human body.[142] Not only are there the watch-bracelets which have been so extensively worn of late years, but minute ornamental watches have been set in finger-rings, where they can be consulted with even greater ease than when worn on the wrist. The watch-face is surrounded by a bordering of small jewels. Apart from their practical value, the “watch-rings” are pretty and dainty objects in themselves, and lend a new element of variety to the long list of ring forms.[143]