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Curved Striae
Flux fusion grown corundum are the most common synthetics. They come in a variety of colors, are very durable, and exceptionally inexpensive to manufacture.
If, when examining a gem your RI indicates corundum, your next step is to distinguish if it is natural or synthetic. Your first clue that the gem you are examining is a synthetic is poor workmanship. Cheap synthetic rubies and sapphires do not get the …
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