View single post by KenC
 Posted: Tue Sep 19th, 2006 01:00 pm
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KenC



Joined: Sun Sep 4th, 2005
Location: Florida &, Arizona USA
Posts: 11288
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 e.avery wrote: Most ETA movements use Mineral Glass.
Sorry......my bad (as they say).....since I did not consider mineral crystal a jewel/gem, I guess I should re-word my comment.  Most gem stones used as "jewel" bearing points are sapphire........mostly grown in laboratories.  Rubies are, in fact, red sapphires.