Essence of Ruby

The Essence of Ruby is a crafting material in Diablo III, added in Patch 2.3.0.

It is only used with Kanai's Cube to convert 9 gems into Rubies of same quality.

Squirt the Peddler sells it, among all other Gem Essences, for 500,000 gold each. The item can be stacked up to 5000.