Vintage chunky hammered gold necklace with detachable mother of Pearl pendant

This is a signed necklace but for the life of me I can’t figure out the maker. The necklace is very heavy and well made , the pendant is detachable, it’s a large 2” high mother of pearl with a surround of small crystals. The necklace has a large lobster clasp and additionally another removable clasp a bit like a scarf clasp, I’m not sure what it’s use is. Excellent condition, measures 18”, pendant another 2” Please see all photos for full description.