Navajo Vintage Sterling Silver 925 Jade Thunderbird Ring. Sz 9 Native American. Gemstone: Nephrite jade Width: a bit over 5/8 Hallmark: sterling Weight: 4.1 gr Condition: Pre-Owned condition, recently polished, no problems. The stone has no damage. Comments: Beautiful piece, you don’t see jade used very often as it was. Please see all photos for details.