Two reliable ways to do it at home: wrap a thin strip of paper around the base of the finger, mark where it meets and measure that length in millimeters; or lay a ring that already fits on a ruler and read the inside diameter. Both, with a full US conversion table, are on our Size & Fit Guide. Measure in the evening rather than first thing — fingers swell through the day — and if you land between two sizes, take the larger.

We do not offer resizing, so please check your size on our Size & Fit Guide before ordering. If a ring does not fit, you are welcome to return it within 14 days of delivery — email returns@sanajewels.com and, for US orders, we will send you a prepaid, insured return label — and order the right size instead. Return shipping is free on US orders. Eternity rings carry a 30% restocking fee on return.

Yes. Every piece is made in genuine metal — 10K, 14K, or 18K gold, or 925 sterling silver. All pieces are stamped with the corresponding metal marking.

In time, yes. Silver reacts with sulfur present in ordinary air, and the darkening that follows is chemistry rather than a fault or a defect. A soft dry cloth lifts it. Storing the piece in a closed pouch away from humidity slows it down, and rhodium plating, where a piece carries it, slows it further still.

Yes — natural or lab-grown, every diamond is genuine, and the listing says which. Our natural diamonds are certified compliant with the Kimberley Process — the agreement between governments that keeps conflict diamonds out of the legitimate trade. It is worth knowing what that covers and what it does not; we set that out plainly on our Ethical Sourcing page.

Where a weight is stated as a fraction, it describes a range rather than an exact figure, as the FTC requires. The applicable ranges are shown on this page beside the carat weight, and in full in our FAQ. Your piece will fall within the range shown.

Natural diamonds form over billions of years beneath the earth; lab-grown diamonds are created in a controlled environment. They are chemically, physically and optically identical — the two cannot be told apart by eye, only by instrument. What differs is rarity and price, and we state which is which on every listing.

Yes. Every Sana Jewels piece is covered by a 3-month warranty against manufacturing defects from the date of delivery, and a missing stone is replaced free for the same 3 months (excluding any single stone of 0.12 carat or larger). The warranty is valid in the USA only, and any repair performed by another jeweler will void it. Full terms are in our Return & Refund Policy.