The Rare Spectrum. It sells for $500,000, but the combined value of the nine gems needed to forge is $9,000,000

RecipeEdit

1. Forge together three +400 fire attack gems.
2. Forge together three +400 ice attack gems.
3. Forge together three +400 water attack gems.
4. You should now have three rare elemental attack gems. Forge them together in this order: Fire - Ice - Water