Gold filled silver 925 citrine/lemon quartz pendant necklace

The pendant itself is a semiprecious faceted stone, yellow clear, either a citrine or quartz. Perfectly encased in a brushed gold rim. The chain and pendant metal is silver 925 - stamped inside lobster clasped, but probably gold filled. It is a vintage piece, I have owned it for more than 20 years and acquired it as a family heirloom. . The maker’s mark is IDGC which could stand for a Canadian company dealing in precious and semiprecious stones. The chain is built up with small semiprecious stone beads with color on yellow, light purple and green tones. Dainty but stunning.