Frequently Asked Questions
Everything you need to know about our luxury collections and services.
What materials are used in Kosiner Jewelry pieces?
We use premium materials including 14k and 18k solid gold, sterling silver, and ethically sourced gemstones. Each product page provides specific details regarding the composition of the piece.
How should I care for my jewelry to ensure it lasts?
To maintain brilliance, avoid contact with perfumes, lotions, and chlorine. Clean your jewelry gently with a soft lint-free cloth and store it in the provided Kosiner pouch when not in use.
Do you offer international shipping?
Yes, we ship worldwide. Shipping costs and delivery times vary by destination and are calculated at checkout. Please note that international orders may be subject to local customs duties.
What is your return and exchange policy?
We offer a 30-day return policy for most items in their original, unworn condition. Please note that custom-made pieces and earrings are final sale due to hygiene and production standards.
How can I determine my correct ring size?
We provide a comprehensive size guide on our website. If you are between sizes, we generally recommend sizing up for a more comfortable fit, or you can order our physical ring sizer for total precision.
Is my payment secure on your website?
Absolutely. We use industry-standard SSL encryption and partner with trusted payment processors like Shopify Payments, PayPal, and Klarna to ensure your financial information is always protected.