Jewelry Care
What I actually use, and what I actually tell customers to use.
Read this first: never spray, soak or ultrasonic a porous stone. Turquoise, white buffalo, spiny oyster, opal, coral and pearl absorb liquid and it does not come back out. It dulls the stone, discolors the matrix, and can loosen it in the bezel. For any piece with one of those stones in it, use a dry polishing cloth on the silver and leave the stone alone. Liquid cleaners are for plain chain, watches and eyeglasses.
Most turquoise jewelry is not ruined by wear. It is ruined by cleaning. Get the method right and a good piece outlives you.