Aluminum oxide powder. Mohs hardness=9, for polishing harder gemstones over 7.5 Mohs. Make your own slurry.
Fundamental Rockhound Products: 1 oz .3 Micron Aluminum Oxide
Aluminum Oxide Polish: 2lbs : Health & Household
Ceramics Al2O3 Powder Aluminum Oxide Polishing Powder Alumina
Premium Grade Cerium Oxide. Designed for stone and glass. Mix with water to make a slurry., Average particle size of 1.5-2.5 microns.
Cerium Oxide Polish
Aluminum Oxide Polish: 2lbs : Health & Household
Lightning Lap D'Lite Diamond Laps – LightningLap
Aluminum Oxide Polish: 2lbs : Health & Household
Aluminum Oxide Polish: 5lbs : Health & Household
Aluminum Oxide Polish: 5lbs : Health & Household
Aluminum Oxide Polish/Great polish for stones of all hardness's High Quality Grit Tip sheet and instructions also included
Aluminum Oxide Polish: 5lbs
The Beast Diamond Polish by Lightning Lap – LightningLap
Aluminum Oxide Polish – LightningLap
Aluminum Oxide Polish: 5lbs : Health & Household
Our Aluminum Oxide polish (works good at a reasonable price) best on Quartz, Agate and harder stones. At 2 micron and finer, this polish is likely
Aluminum Oxide Polish
Chrome-Oxide