Your necklace is actually marked 585, not 685… 585 is the European Hallmark for 14 karat gold. The value of it really depends on several things… Condition, gram weight and the current price of gold. I don't know a whole lot about Balestra but it's a highly sought after designer and that could increase its value also. Hope this helps!
Beth
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Balestra by: Anonymous
Hi there! It is most likely Giovanni Balestra (look up Balestra 1882) but I'm afraid I'm not sure of the value. I hope this helps!