Natural certified Tanzanite set on Sterling Silver & stamped. This ring is slightly adjustable however it is sized. All sizes are available made to order which is no more than 2 weeks. Construction is Solid Sterling Silver A delicate yet tough natural Tanzanite Ring. The stones are naturally mined Tanzanite. No treatments have been used, all natural oval faceted 3.0mm x3. Other than that this is a really cool piece of fine jewelry. Custom handcrafted, one-of-a-kind open ring design. Brand new & all my items come boxed with wrapping. Message me with questions & thank you :) Tanzanite Multi-stone Open Ring Certified Natural Size 7 Ready To Ship