If you run a search for completed listings on eBay for La Tausca, as of now you will see one necklace that sold for $22 (probably for the value of the 14K "diamond" clasp), another erroneously listed under Fine Jewelry that sold for $20 (seller failed to mention they are imitation; buyer may have hoped they were real), and a bunch of unsold necklaces.
But there are a number of ornamental brass trinket boxes of the same brand that sold very nicely.
It's true that most pre-owned imitation pearls don't sell for much, if at all. Majorica brand are the only imitation pearls I know of that tend to sell well.