My wife loves earrings, so once while she was away on an extended business trip, I sent her some diamond earrings.  I felt nervous sending them in a box or regular envelope, so someone told me I ought to consider using bubble mailers.  Bubble mailers are great because they do a terrific job of sealing their contents and protecting them in the mail.  I never had a doubt they would make it safely, and I was exactly right.  It may cost a few extra pennies to buy these envelopes, but for me, the peace of mind was certainly worth it.  They are great for sending jewelry and many other valuable items.