How do casinos stop individuals from counterfeiting gaming chips?

Here is a great answer for your question:

To begin with, the manufacture of genuine casino chips (known in the trade as "checks") is more complicated than one might think – as you suspect, they're not just discs of colored plastic. They are created, machined, and finished using very specialized equipment, and generally feature several antifraud measures ranging from serial numbers to embedded microchips, as well as each individual casino’s own logo and related branding. Casino chip production is handled by the security printing industry, which also makes things like checkbooks and credit cards. Every stage of manufacture, from the sourcing of raw materials to the delivery of the finished goods, is governed by strict security checks and protocols. Trying to create counterfeit chips that are a perfect match for the real thing, in terms of appearance, weight, and feel, is more or less impossible, even before you start worrying about microchips and suchlike.

But let’s say you somehow manage to produce counterfeit chips indistinguishable from those used at Cecil’s Lucky Horseshoe Casino and smuggle them into the house. This still isn’t going to do you much good. If you just walk up to the cashier’s window and try to convert your chips into currency, the casino will immediately wonder where you got them, given that you haven't been seen playing at any of the tables. If you sit down and play a few games first, whether cards or roulette or anything else, there comes a point when you'll have to add your fake chips to whatever stash has come your way legitimately. Think about this. You are literally surrounded by live surveillance cameras, and you've got trained security officers and professional croupiers watching your every move. How are you going to get the fake chips on the table? And even if your sleight-of-hand skills are such that you're able to do it, you're still not going to have an easy time at the cashier’s window. If you're cashing a lot of high-value chips, the casino is going to find you interesting, and that’s not good for you. They may even invite you to step into a back room for a quiet chat about your luck and the chips you've just attempted to cash. Good luck with that.

Other measures also include RFID chips embedded inside of the casino chips, especially the high-value ones.

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