This ring features a large piece of Green Kunzite, gem quality, also known as Hiddenite. Would be a great ring for a rock collector. It would fit a man's finger better than mine - i modeled it, but it is a size 11. I could make it into a size 10 if someone that size wanted it. I took a picture with it on my thumb to show how it would fit someone with larger fingers. Pretty impressive Crystal, bound to be a conversation starter. GREAT for a rockhound. It's a bit deeper shade of green than my camera conveys/ Made of a nickel / Silver alloy.