Lightbrite
Your first question asks about inheriting a engagement or wedding ring from a family memebr who git divorced or had an unhappy marriage.
The inheritor has little say in inheriting. Ownership passes under the terms of the will or the laws of the state it there is no will.
Your question is really whether one should reuse an engagement or wedding ring in these circumstances?
Our family passes down diamonds for use in engagement rings, but never reuses the settings. Each kallah deserves a new setting made for her. We’ve never recycled wedding rings. There is a box in the vault with an accumulation of ancestral wedding rings, their value is strictly sentimental.
I don’t personally believe that any ‘bad luck’ or karma attaches itself to a stone that is reused. If you go to a jeweler to buy a engagement ring, unless the stone is cut to order or has a tracable serial number engraved you have no idea if it was previously owned by a consumer and reset for sale.