This is an extremely rare-vintage Tiffany & Co. size 6.5 women's ring made by Tiffany for NASA Rockwell International. The ring is sterling silver and the gem stone is untreated natural chalcedony. On each side of the shank there is the Rockwell logo. The stone is 8 X 12 mm and in excellent condition. Stamped "Tiffany & Co. STERLING 925". Includes Tiffany bag, box, and pouch as well. Gender: Womens. Condition: Pre-Owned, Excellent. Comes with TrueFacet Certificate of Authenticity, Original Box and Pouch.