If jewelry’s on the Christmas gift list, make sure it won’t cause more than the recipient’s face to glow. Earlier this year, federal officials began investigating a lapse in regulations that allowed irradiated gemstones, particularly blue topazes, to be sold without being tested for radioactivity by a licensed distributor.

Some retailers have stopped selling the stones until the issue is resolved, but officials and many in the industry say it’s not a big deal. The process is “decades old,” according to a U.S. Nuclear Regulatory Commission representative, and no one has ever reported being harmed by the stones.

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