What does "likely to ever be found" mean?
"Likely to ever be found" in this context means these gems seem to be the largest of its kind ever discovered; no other tanzanite that has been found was as large as these pieces. It's oddly worded in this sentence because it is usually phrased to mean something is hard or difficult to find. You also may know this, but the word "likely" means a high chance of something occurring.
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