After seeing the lighting on the piece in your last post I can tell you for certain that only one stone is Turquoise, the far right, the center stones are all Gem Silica Chrysocolla and the far left stone is Amazonite....It would be wonderful to get a history of it, it is fascinating and really cool looking......another note, Lapidary was not a precision craft out west in the old days, with the exception of some Native tribes (Zuni needle point), the Gem Silica would have required something a bit more advanced for cutting than what the Turquoise would require, I don't believe that the Gem Silica was being actively cut until the the 1940's and later. The stippled letters are also cool, what could they mean, the maker's initials, an event, the person it was made from or presented from???? The component that has the initials could have been from and earlier time and have nothing to do with the current piece, just left there because it looked cool???? Too bad you may never know, if you are ever in the Phoenix area, I would love to see it in person......also, backlight the stones, the center stones should all light up and transmit the light, the far right not at all and the left stone partially, good luck, Thomas
PS let me know if you ever plan on trading it away or selling it