We offer a free lifetime warranty against manufacturer defects and have a one-year warranty on the craftsmanship of all our jewelry. We cover repair or replacement costs for jewelry that has been deemed defective. However, we do not cover normal wear and tear and/or abuse, loss of gemstones, chain breaks, loss or theft. We recommend you purchase insurance for all of your precious jewelry. Repairs performed by someone other than our team will void this warranty because these kinds of modifications, when done incorrectly, can damage the gems or the strength of the setting.

We offer one free resizing in the first year of purchase: all you pay is the shipping. Just be aware that resizing can take three to six weeks. In some cases, we may not be able to resize a piece. If that's the case we'll let you know before we make the ring. We can't accept returns of items that have been sized.

Currently we offer free standard shipping on orders over $100 to United States customers. Some expedited delivery requests will require an additional charge. Contact us to request special express delivery and we'll do it if possible. It may require overnight delivery or Saturday delivery, which are both an additional charge.

It isn’t always possible to pinpoint a mined gemstone’s origin after it has been cut and polished. We choose our suppliers carefully and do our best to ensure every gemstone we sell is responsibly mined.

We only sell gems we would want to purchase ourselves. When shopping for a colored gemstone, you can assume the gems are enhanced by trade-accepted practices, like heating. Some varieties are almost always enhanced, like Ruby, Emerald, Sapphire, Blue Topaz, Black Onyx, Tanzanite, Black Diamond, and Citrine. (If you prefer an unenhanced gemstone, in particular, a fine ruby, emerald, or sapphire, you should expect to pay a premium and receive a report from a well-respected laboratory like the Gemological Institute of America confirming the gem's natural origin.) Katharina does not sell gemstones that have been treated in non-standard ways, like bulk diffusion, glass filling, lasering, or coatings.

Unlike diamonds, there is no accepted grading system for colored gemstones. We hand select AAA quality gemstones are very well cut, with lively brilliance and a very good polish. In pieces with multiple gemstones, we take extra care to make sure all the stones in the piece are well-matched.

Katharina only offers color enhanced gemstones that have been treated in trade-accepted ways to maximize their beauty. Amethyst, Aquamarine, Blue Sapphire, Citrine, Ruby, Tanzanite, and Yellow Sapphire have been enhanced by heat. Black Diamond and Blue Topaz have been enhanced by irradiation. Emerald's fissures are filled with oil or resin to reduce their visibility.

We don’t recommend it. Any modifications made to your original piece by unaffiliated jewelers will void your warranty.