Evaluating the quality of spinel mainly depends on the following aspects:
(1) Color: The 색깔 of spinel with high value are deep red, purple red and 주황색, 오렌지 red. The values of the spinel of other 색깔 are relative low. But the spinel with color changing effect is an exception.
(2) Defect: The spinel is usually clear with few defects. If our eyes can see the defect, crack 또는 cleft, then its value will be greatly decreased. If there is inclusion in the spinel, so long as it does not damage the integral color of spinel, then it has little effect...
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