J
JEWEL
JUMP RING
Generally, synthetic sapphires or rubies that act as bearings for gears in the watch, reducing friction. Sometimes, precious or semi-precious stones are used in high-end watches.
A jump ring is an oval or round ring of metal wire used as an attachment loop on charms, as a pendant bail, or as an end ring on a chain.
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Last updates NOV/09/2010 3:32 PM EST
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