What can be done if wife sold wedding ring 4 months before any separation agreements were discussed?

You can't do much about the wedding ring unless she already agreed to pay you something or return it in a separation agreement. Engagement and wedding rings are separate property of the individual spouse. The bigger issue is taking $40k from a retirement account. If it was from an account that was built up during the marriage, then 50% of the money was yours and she's responsible for reimbursing you those funds. Any bills she paid after separation, unless they were marital debts, are her separate debts and not your responsibility. That's the basic answer, but there are plenty of complications that could affect the outcome on those retirement funds. You need an attorney.