Photo #71A
GHI/Fire and Red Corundum (Ruby) in Quartz matrix.
Corundum is supposedly outside the realm of tumbling due to the hardness (Mohs 9) being too close to the hardness of the grit, but, not in the case.
I do admit I have had many failed several attempts to tumble Red Corundum (Ruby) and Blue Corundum (Sapphire) in different crystallization formations. These remain pending.
Someone suggested that I put the stones under Black Light to actually confirm if they are rubies as they would fluoresce pink. Yep.
Photo #71B
Here is what the original material looked like:
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