For your consideration is this nicely made necklace by Great Falls Metal Work. It has a great modernistic look with onyx and what I believe is turquoise. Signed on the back Sterling GFMW. It has an extension chain that I have no idea if original. Nice light patina and some age.
The pendant measures 3/4 inches by 7/8 inches including the top loops. The chain measures 15 and 3/8 inches not counting the extension. The extension allows you to wear it up to 4 inches longer.. 19 and 3/8 inches or in between intervals.
Condition is excellent with no damage.