I need a design for a girls trip shirt

Hi! I am helping my mom with a custom t-shirt design for their girls cruise. The girlfriend group calls themselves "diamonds in the rough" so we would love to incorporate that. Also, the key part of this trip is that one friend is paying for the whole thing. She was on a cruise about a year ago and received word from her doctor that she needed to fly home immediately to undergo treatment or she may not survive. Come to find out, there was an error on the test, so in honor of her not dying, she wanted to pay for them all to take a trip together. They are calling it the "Libby Didn't Die" cruise. We definitely want that on the shirt! These are a group of 60+ year old women down to have a good time!
Thanks!