Not a clue to what these are...Diamonds in the rough?

[dycab]

Hello there fellow detectors! I don't post much, but very much enjoy browsing through posts and learn a lot from you all!
I found these around a smaller tree in a park that's been there since the 1950's with my son... Wow Dad, what's that? No idea son, Wow Dad, another one - 5 times..... and we have no idea what they are... I told him I didn't know what they are, but if one is worth a million dollars, we were up to 5 million on one tree!

They weigh 0.6 oz, and are sort of "diamond shaped"...about an inch on the longer edge point to point, about 3/4" on the smaller points, and a magnet sticks to them... any thoughts? Thanks very much in advance!

 

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[JOHUNT]

spinning tops? dice?
Could you get a few more pics of different angles?