‘I was dumbfounded’: My mother-in-law gave me a ‘diamond’ ring. A gemologist said it’s fake. What should I do?

Dear Quentin,

My mother taught me never to hold a grudge. It’s proven harder in practice than in theory: My mother-in-law gave me a “diamond” ring and said she wanted me to have it for everything I’ve done for her. I thanked her and let her know that it makes me happy when she is happy. 

When I took the ring to a jeweler to have it…