1794 R. Kirwan (ed. 2) I. 254 The stone imported from Ceylon, called ruby spar,..is an iridescent sort of spinell ruby.
1877 ‘A. Ashmore’ xxiii. 291 He..swept off the most costly of the ornaments into his rapacious valise; packing in paperweights of solid amethyst, vases of cut cornelian, ruby-spar, and frosted silver.