My lovely mother-in-law (in her 80's now) has given my husband some of her jewelry for long-term storage in our safe deposit box. Included among the pieces are a strand of akoya pearls from the 1940's, a double strand akoya bracelet, and a double strand of silver/blue baroque akoya from the 1950's/60's. (This particular strand is what got me so excited about PP's baroque akoyas that were recently available. Compared side-by-side to the double strand that PP made for me, they are difficult, but not impossible, to distinguish.) There are also several pairs of pearl earrings.
I've read that storage in a safe deposit box is not a good idea. It's too dry an environment for the pearls. But, we really don't have a choice. She's having us store them because she recently had several other lovely old family pieces stolen and she doesn't want to risk these.
Any advice? Could they go into the safe deposit box for a few months at a time, then be taken out for a time, then put back in? Help pearl people, help!