The Qalo silicon wedding band: http://qalo.com
My wife bought this for me and I fell in love with it. This ring is safe to work or roll in without risk of ring damage or more importantly finger injury. No need to worry about losing your wedding ring while you train because it's no need to remove it. I wear mine on days when I train or teach so I have no worries. This ring is also great for anyone working with their hands, it is nonconductive so safe it's safe around electricity. You can pick your favorite color or rep your rank. This ring is a must for married bjj practitioners.