Are these diamonds real or fake?

I have a hobby of Metal Detecting ,and me and some freinds went on a trip to the florida ”beaches”well i found a ring i think are diamonds{22 small} but not sure if they are real or fake. how would i tell if they are real? here is what it sais on the inside {{{{18kgersc}}}

just go to a lab pay a little money and they will tell you wether it is real or not or go to a jewlery store

Metal detecting So. Florida Beaches W/ James # 7 Wabasso Bch Florida