I remember a scene where Tony is together with a girl in college. She has not given him any jewellery because she said she wants to save for something better. She has only given him a bracelet. Later Tony found out that she had another Omega wich she gave a lot of jewellery.
Tony falls in heat(?) when all the avengers live together. The Team gives him jewellery before they sleep with him. They find out later that Tony does not carry any jewellery because he does not has any and not because he does not want to carry them.
I really hope you can help me! LG