Vintage Gold pearl necklace

Vintage necklace with 9 pearls. I am unsure of the gold or pearl quality since I do not see any markings or stamps. The gold seems sturdy without tarnish, and the pearls show minimal signs of age. This was my great Grandmother's, so I think it's about 1920s or 30s. However, I am not a jeweler, so I would hate to claim something untrue about this beautiful piece of jewelry. I know it is gold in tone, and the gems have a pearl like quality. Comes in travel jewelry case.