Corundum Polishing Survey Results

polishing corundum - Barion cut sapphire
“Sapphire,” 0.81 cts, fancy Barion Superman cut, Montana. © Dan Stair Custom Gemstones. Used with permission.

Editor’s Note: Some years ago, the International Gem Society (IGS) conducted a survey of members’ polishing techniques. Here, you’ll find the results for corundum polishing. The corundum gem family includes both ruby and sapphire. Whether you’re just starting to learn the art of gem cutting or just looking for a new way to tackle a problematic gem material, we hope these results provide some useful suggestions.

For more information about the survey or to find results for more gemstones, click here.

Check out these articles for additional recommendations for polishing sapphires and polishing synthetic corundum.

Corundum Polishing Techniques

Ceramic50-100k diamondextender/oil44
Tin14-100k diamondwater, vinegar/oil13
BATT50-100k diamondoil or water8
Ceramic50-100k diamondnone/alcohol/other8
Fast or Last lap

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