This is a beautiful necklace that was appraised at $400 to $500 at a Haddonfield, New Jersey gem shop in 2004.     I am not a "jewelry guy" at all, so can't answer too many questions about this item (which I'm hoping to sell for my friend, who is the grandniece of the previous owner).    It weighs .42 oz if my scale is accurate.  I don't see any markings on the reverse of the settings; the chain is gold colored and presumably gold; the settings are more silver in color.    The colors are beautiful and I have every reason to believe that the appraisal 18 years ago was accurate.   Thanks for looking.