Like. A little thin for stone. This is not real jade which would be a little less brittle. However, it hasn't broken yet. It's great to carry in my bag. The edges are quite thick and rounded. This is a small pocket tool, mind you. As long as he's okay. I have a thickness of 6.8 mm. I've included a picture of the instrument and one next to the 40mm chronograph for size comparison.
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