Tiffany and Company, natural salt, water, cultured pearls

Tiffany’s natural salt, water, cultured pearls mid length with white gold clasp was bought for $6,000 15 years ago. I was told by many jewelers that you can not make these pearls anymore it’s illegal to do so. Therefore I am looking for at least $10k-$20k for these pearls as you can see they have a very pink natural luster, which is very rare and are in exceptional condition!