Sixteen inches sits at the base of the neck, eighteen just below the collarbone — the most versatile length — and twenty inches and above sit on the chest. If you intend to layer, choose lengths at least four inches apart so the pieces do not land on top of one another. The full table is on our Size & Fit Guide, and if the length turns out wrong you have 14 days from delivery to return it.

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.

Yes — natural or lab-grown, every diamond is genuine, and the product page 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 product page.

Yes. Every Sana Jewels piece is covered against manufacturing defects from the date of delivery, and a missing stone is replaced free under the same warranty. It is valid in the USA only, and any repair performed by another jeweler will void it. The full terms, including the coverage period and the limits on stone size, are in our Return & Refund Policy.