Ruby with Hornblende Slabs
This striking material has a sparkling black background with great
contrasting ruby. It makes for unusual and beautiful stones. Because
of the fragile nature of the hornblende, be careful when sawing and
grinding Ruby with Hornblende. To get the best results use the same
techniques normally used to grind and polish ruby (corundum). This
entails using loose diamond for all grinding and polishing finer than
This material must be polished with diamond, but the hornblende may
take a better polish if quickly hit with Zam (green rouge).
Ruby (red corundum) has a MOHs hardness of 9.
Example of Ruby with Hornblende Cabochon