In excellent condition with no signs of use.
A very lovely diamond solitaire ring from Tiffany. Dating around 2000. 
This design currently is not around in white gold.
The bezel set diamond measures 5.36mm in diameter 
A bezel setting is when the precious metal is shaped into the exact size of the diamond. The diamond is then set into the metal and sealed all the way around.
Wonderfully clear, sparkly and flawless as you would expect from Tiffany. 
I make it  0.58 ct. Clearly marked for Tiffany and 18ct. 
It comes in a Tiffany pouch. 
Size J (UK). 4 3/4 (US) sizeable.