"G Keeves" likely refers to Gary Reeves, a well-known Navajo silversmith recognized for his intricate, hand stamped designs and use of high quality stones in his jewelry; "G" being the initial of his first name, Gary. He is a Native American artist from the Navajo tribe.
Gary's brother, "Sunshine" Reeves, is also a renowned Navajo silversmith and they both learned their craft from their brother David Reeves. His work is often described as "Navajo Revival" style, featuring complex geometric patterns and traditional designs.