Vintage Navajo .925 SILVER Engraved TTC  Turquoise & Coral Ring Sz 8 with a weight of approximately6.67 grams.  Unknown who TTC represents but this ring appears to be quite old.  The turquoise stone has a lot of stories to tell.  The top of the ring with the two stones together has a length of 1 9/16" and a width of around 3/8".  I have left this in the original patina but your choice if you want to clean it.  Thanks for looking!