not if you write no machine on front and back of envelope i do this all the time when i send jewelery out specifically if its this small then i wont get crushed
FYI, when I mail gemstones, I wrap them in between 2 layers of bubble wrap and then wrap shipping tape completely around the whole thing. Then I put them in a small bubble lined envelope. Finally, I mark boldly on the outside of the envelope: Hand Stamp Only. Does not cost much at all to mail out.