In the Synthesis window, you can level up Gems by consuming Gems that you do not need.
First, select the Gem you wish to improve. Then you can select which Gems you wish to consume. As you select Gems to consume, you will be able to see how much experience it will give to the Gem. Gems with higher star ratings will give more Gem experience. There are also special experience Gems that will give a massive amount of Gem experience.
After selecting Gem Synthesis, you can click on _select all_ to automatically allocate 10 of the lowest level gems to be used as synthesis materials.Experience Gems and Super Experience Gems will be chosen first.
*Note*: Tap on a gem to remove it from being a material for synthesis.
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Game Guide for Age Of Warring Empire