Does the kid get to keep it or has her family learned a valuable lesson about keeping their mouths shut?
Yes, she gets to keep it....................
You get to keep any gems you find. A State Park Ranger and other geologist/gemologists are sometimes there to help you identify what you’ve found.
You find it, you keep it.
Diamonds aren’t rare. If they allowed mining there millions would be found.
If all the diamonds were mined between here and South Africa, 2 carat cut ones would be sold in gumball machines for 25 cents.
Industrial use diamonds are now manufactured.