It looks like you're new here. If you want to get involved, click one of these buttons!
Did you talk to Liz?
Lady Amelia is just reminding you that you should sell the gems and give the money to Lady Emelia when you go back to talk to her.
She gave you a Book of Proverbs to give to Liz and when you give that book to Liz, she solves the quest. The book can't be sold. Do you have it or did you stash it somewhere possibly?
I'm glad you got through!