Gem in a haystack

This is a mash up of “needle in a haystack” (something extremely hard to find) and “hidden gem” (an undiscovered talent or place).  The phrase actually is a great one in context, where a trip advisor reviewer was relating how he had discovered a great restaurant:

http://www.tripadvisor.com/ShowUserReviews-g60805-d396943-r188849786-Matthew_s-Jacksonville_Florida.html

Thanks to Lou Pugliese for sending this one in!