Gemstone: 5.0 ct Ethiopian Welo Opal, 16.2 x 10 x 6.65 mm, Untreated Metal: 3.01 g of Sterling Silver Ring Size: 7 Total Weight: 4.01 g Our Commitments Quality Assurance: The authenticity and quality of our jewelry are guaranteed and every purchase is accompanied by a corresponding warranty card. Should any concern arise, it will be addressed promptly and transparently. Gemstones: Our gemstones are sourced from trusted suppliers, and, when appropriate, examined in our in-house laboratory. Packaging: Our jewelry is presented in high quality packaging — ideal to elevate every gifting or self-indulging experience. Shipping: Parcels are promptly sent via registered air mail with tracking. Higher-value items include insurance coverage.