Thrift store find: gold colored metal stamped 950

[Lusanders]

Today I found a gold colored lapis (?) necklace. I haven't ever seen this stamp before. I thought perhaps it was a gold plated sterling silver find, but I don't know.... It's about 18" and hinged. Does anybody know?
Thanks!

 

[ARC]

Pictures will help me / us.

 

[Hawks88]

Welcome to tnet.

 

[cudamark]

I've found 950 silver and 950 platinum, so, keep your fingers crossed!