Use the Add Gem tool to add a gem to an assembly.
To add a gem to the root Assembly item or an assembly :
If you are creating a Box Radiant, Heart, Marquise, Oval, Pear, Princess or Round gem:
If you select Custom, enter the dimensions of the gem in the Length, Width and Depth boxes. The Size list is unavailable.
If you select Carat, click the Size list followed by the new size option you want to use. The Length, Width and Depth boxes are updated with the dimensions associated with your chosen size option.
If you are creating a Brilliant, Emerald, Hexagon, Triangle or Trillion gem: