It was  recently service by Tiffany and has that proof too as Tiffany doesn't service merchandise that is not theirs.

This stunning Tiffany & Co. ring is a true masterpiece. Crafted from Pt950 diamond and featuring a brilliant cut main stone, this ring is perfect for any occasion, whether it be an engagement or anniversary. The solitaire setting style allows the diamond to truly shine and sparkle, while the ring size of 6.5 and ability to be sized make it a perfect fit for any woman.