Vintage Gold and Pearl Necklace Set

This beautiful pearl and gold necklace and ring set features a pendant with pearl, gold and three small diamonds. The chain is 18”. The ring is approx size 6 with a pearl. As these were gifts, I have approximated value by looking at similar items online. I would like to sell them at a level that has Poshmark authentication so we can be sure the metal marking is right and accurate (see 14K marking on pic). Welcome all questions.