This is a Beautiful, Morro Redondo Pink Tourmaline Half Eternity Ring. 

This ring is Platinum over Fine Sterling Silver. TCW is 1.15ct and is made up of the following: 

0.95ct Tourmaline 5x3mm

0.20ct Zircon 1.4mm 

VERY Nice !!!! Exquisite Tourmalines AAAAA

Both are natural, earth mined gemstones.

New, never worn from a smoke & pet free home. Size 7