Stone durability varies by stone type. Turquoise is a relatively soft stone, with a Mohs rating of 5-6. Agates, including petrified wood, are harder, around a 7. For reference, Diamonds are rated a 10 and are the hardest.
I create my pieces using natural stones, checking them over with 3-4x magnification in the process for hairline cracks and potential issues. I do everything I can to prevent a piece being made with an issue and inspect the rings prior to shipping.
If you feel your stone has a crack or issue, please reach out within 24 hours of receiving the item. Beyond this point I will not be able to honor returns due to stone issues that might have been sustained outside of my possession.
However, if you break/crack your stone and would like it repaired email me. Stone replacement, repair costs, and shipping will be estimated and communicated with you for approval and repair. Thank you for your understanding.