Making a Ruby The Making of a Ramaura™ Cultured Ruby Removing the crucibles from the furnace. Judith pouring molten flux off the rubies attached to the platinum crucible. The red-hot flux is the same temperature as molten lava. The crucibles cooling to room temperature. Opening a crucible and removing excess hardened flux. Rubies in their natural hexagonal form; knocked out of the crucible with a mallet. The finished ruby Beautiful, faceted and polished. The Ramaura Cultured Ruby! This jQuery slider was created with the free EasyRotator for WordPress plugin from DWUser.com. OK Rotator powered by EasyRotator for WordPress, a free and easy jQuery slider builder from DWUser.com. Please enable JavaScript to view.