14k Tahitian Pearl and Quartz Necklace

I bought this necklace preowned 7 years ago off of eBay. The clasp reads .585 which means it is 14k yellow gold. It features amethyst gems, Tahitian pearls and has a center piece that is quartz crystal. I am unable to confirm the purity of the metal nor the type of gems the necklace has as I am not a jeweler. Please look throughly over the pictures and ask questions before purchasing! Thank you for looking!