Vintage Sterling Multi Strand Amethyst Glass Clasp & AB Crystal Pendant Necklace

This unique necklace features three different styled chains all linked together with small faceted AB crystals at the end into an oval shaped box clasp with beading & a faceted amethyst colored glass stone. The chain is strung through a small square shaped pendant with matching faceted crystal drop that can be removed if chosen. I was not able to determine what the hallmark is on the pendant. There is a slight long “shadow” line in the stone- it does not appear to be a chip or crack, may just be a flaw in the glass. Hallmarks: 925 on clasp & the pendant 3 point crown & S(?) Measurements: 18” chain with the pendant/charm at 1/2” Condition: Beautiful vintage condition with noted shadow in glass stone.