possibly useless: whale’s pearl

"Ambergris has been a valued commodity for centuries, used in perfume because of its strangely alluring aroma as well as its ability to retain other fine-fragrance ingredients and “fix” a scent so it does not evaporate quickly. Its name is derived from the French “ambre gris,” or gray amber. During the Renaissance, ambergris was molded, dried, decorated and worn as jewelry. It has been an aphrodisiac, a restorative balm, and a spice for food and wine. Arabs used it as heart and brain medicine. The Chinese called it lung sien hiang, or “dragon’s spittle fragrance.” It has been the object of high-seas treachery and caused countries to enact maritime possession laws and laws banning whale hunting. Madame du Barry supposedly washed herself with it to make herself irresistible to Louis XV.

In "Paradise Regained," Milton describes Satan tempting Christ with meat pastries steamed in ambergris. In “Moby-Dick,” Melville called it the “essence found in the inglorious bowels of a sick whale.” Old newspapers show clippings every few years describing some whaling crew coming upon a hunk, or some vacationing family finding it on the beach and either cashing in — or discovering it was just ocean detritus."