Corundum var. Ruby in Zoisite Locality: Longido, Arusha, Tanzania Description: Superb hexagonal ruby crystal, the red-pink gem variety of the mineral species corundum, in green zoisite matrix. The ruby crystal has exceptionally rich color and runs completely through the matrix. From the Online Mineral Museum
1930's Art Deco ruby and diamond double cluster ring, set with a central ruby of approximately 1 carat. The central ruby is encircled by an old-cut diamond cluster surround, all within a border of calibre-cut rubies set in platinum.