Vintage 14K gold filled delicate necklace with natural white pearl

Vintage / antique 14 karat gold filled necklace with natural white pearl. Stamped 1 / 14K GF and also has a makers mark. The central part of the pendant has brushed surface, as part of the design. The pearl looks round and uniform, possibly a saltwater / South Sea (?) pearl, but can't say for sure. 15" chain. 1.5 cm pendant. Gold filled vintage jewelry is considered valuable and collectible as it tends to be of better quality and also contains quite a bit of gold.