"Thanks!" to Liza (in this post), who shared the following news: The latest J.Crew Jewels Catalog sent to customers may have a unique promotional code for 20% off on any order.
The code is found on the back. Liza shares in her post: "...I received a J Crew Jewels catalogue yesterday that has a 20% off promo code on the back. I almost threw it out before I saw the note on the back."
So double-check your Jewels catalog to see if you got a unique promo code too! :)