Signed turquoise inlay pendant on fine chain, both sterling

Measuring a half inch across and just under an inch long (with the bail) the turquoise pendant is understated but elegant, with a Frank Lloyd Wright feel. It is marked SS Sterling, which is the mark for Navajo artist Stan Slim - although I haven't seen the symbol underneath in connection with his work. The chain is 16 inches long and is marked RR (with one R backwards) STER. All in very nice condition.