Vintage 10K or 14 Karat GF necklace with pink glowing moonstone-like pendant

Vintage gold filled necklace with delicate filigree pink pendant. In excellent condition. Stamped GF. Back then, the filling was usually made using solid 10K, 12K or 14 karat gold. 18" long chain, which can likely be used with other pendants. 0.5" pendant (with bail). The pink insert is art glass with a glowing moonstone effect. Gold filled vintage jewelry is considered quite valuable and collectible as it tends to be of better quality and also contains quite a bit of real gold.