I found a reproduction Sears catalog and in with the Columbia and Harvard machines they were advertising both Sapphire reproducer balls (of the highest quality for $0.75), and Brazilian Pebble reproducer balls (noted as being sold by many dealers as Sapphire for $0.20).
Has anybody come across both types? any thoughts on the longevity of the Brazilian pebble, aka quartz, vs the Sapphire? Mohs hardness for quartz is 7, and 9 for sapphire.
Also, did they actually use sapphire? or did they use corundum? for those not familiar with rocks/minerals/gems, sapphire is one of the gem varieties of corundum, ruby being the other gem variety. They all share the same physical properties, including crystal structure, hardness, chemical formula.
Sapphire vs Brazilian Pebble
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- Victor I
- Posts: 106
- Joined: Sun Oct 19, 2014 1:21 am
- Location: Minneapolis, MN