The Sting

If you are lucky enough to have a watch from Uncle Mephisto that says Cartier, Patek-Phillipe, or Vacheron-Constantine, already you may have a down payment for a house. If not, Elgin, Bulova, Waltham, or Hamilton will do if they say 14ct inside the case, but not any house down payment, or even a house payment. Take your goodies to a bonafide gold buyer armed with some limited information from a source that was not offered the items for sale. The 10 K pcs=15x weight in dwts, 14K =20X dwts, and 18K= 25X dwts should give you a fair price for just gold. Some jewelry is just that, value of the gold only because it is not desirable to sell, or has no value in stones or workmanship. So you walk in to the establishment and say"Bubba, I've got some things I'll sell for the right price, and this ain't my first rodeo."
Now know that you can't sell sentiment, and nobody's going to be interested in why Aunt Lulu got rid of her stuff to you, or why you really don't want to sell this pc or that pc. Determine what the parting price is for this stuff according to what your needs are. Diamonds add to value, as does other precious and semi precious stones and some pcs are made by makers such as Tiffany & Co, Van Cleef and Arpels, Cartier, and others. This makes the items more desireable.
So in summation, good luck, keep your wits about you, don't be stonewalled, and if you're not satisfied that you are getting treated right, walk away. Showing the stuff and getting offers do not make you liable. You don't owe them a thing. You will learn something and maybe you'll be richer.