Black Onyx necklace with Druzy Quartz pendant

A necklace from the 70's. It is labeled Mariana but it doesn't look like the Mariana I am used to but could find no other. Black Onyx beads connect to tribal looking beads which then connect the unusual piece holding the quartz. The finding is labeled 925 but the main piece is not labeled. Unless I find out differently, I am pricing this as silver overlay. Beading is 18" long, pendant is 2". A bohemian style necklace for the gypsy in your soul.