This 16" choker-style necklace is made of rings of brass with small, faux-cut, teardrop shaped charms in three colors: pale green, light aqua and a Robin's Egg blue (see photos).  The charms are likely a plastic resin and the brass rings are not precious.  They are showing signs of age, but a good polish may restore them. 
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 _gsrx_vers_850 (GS 7.0.17b1 (850))