There was just a discussion about this actually. That is what some of thought was an open culet, but Less talked to one of his experts and it is because the moissy is a bit of an off cut, and too shallow, so it causes a strange reflection that looks like an open culet. I *think* that was right...either way, it is normal in moissy, and why many of us are waiting for the H&A cut...myself included.
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Joseph Schubach Jewelers