White fused alumina is produced from high-quality aluminum oxide powder, refined and crystallized through electric arc smelting.
Brown fused alumina is produced by melting high-quality bauxite, iron filings, and anthracite in an electric arc furnace at high temperatures.
Zirconia fused alumina is produced by melting aluminum oxide and zirconium oxide in an electric arc furnace at temperatures above 2000°C.
Pink aluminum oxide or ruby aluminum oxide is made by aluminum oxide powder, which is electrically fused at high-temperature by adding appropriate amount of chromium oxide, etc.