Normal curve 0-2 works well for sapphire, tourmaline, amethyst, and garnet. Short curve, with a higher percentage of small particles may be more suitable for emeralds. 0-1 would be too slow for hard stones so most of the polishers prefer 0-2 because it can remove small scratches and polish quickly. Manufacturers should experiment to see which sizes work best for their particular application.

Recommended applications:
Polishing - carbide/diamond wire drawing dies, precious/semi precious gemstones, metallographic specimens, and, optical lenses.
Lapping - ceramic/carbide valve seats, wear parts, and glass components.
Superfinishing - watch jewels, semiconducting crystals, ferrite type recorder heads, and numerous electronic components, gemstones.