Gimmick coins in this month's World Coin News.

Here's one I mentioned in another thread. A real emerald.

 

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ultra high relef:

 

Most vending or self-checkout machines these days seem to take the small dollar coins. Few take half-dollars, but the Walmart machines do. I don't think any machines take Ikes (or other large dollars, if you're clueless enough to try spending one at face value).