Tiffany offers a "Diamond Promise" specifically for those looking to level up their engagement ring rather than sell it for cash.
: To use this credit, your new ring must cost at least twice as much as the original. will tiffany buy back their jewelry
: The item must be in perfect, "saleable" condition, and you must have the original receipt and all packaging (the blue box and pouch). Tiffany offers a "Diamond Promise" specifically for those