Gem Forge

The Gem Forge is an add-on for Infinity Blade II, introduced in version 1.1. The Gem Forge allows the player to forge new gems by putting 3 gems in a 'Gem Forge' side menu, and waiting for said amount of time, which can range from 30 minutes to days*. However, one has the option to skip the process by paying an amount of gold, 2,500 per 30 minutes, scaling against how much time remains for the gem to be created. Certain gems here can be created, that can only be found in the Forge, some of which can be extremely useful, including reducing a Titan's speed. Interestingly enough, one can hit the gold cap for a gem in the Forge, which is 500,000, while using only about 100,000 - 200,000 Gold. This allows for efficient and easy gold grinding.

30 minutes real time = 1 month in game.

Another way to cut the time needed to forge gems is being reborn as it fast forwards time by at least 6 months in game time. Leaving gems to be forged and not speeding them up with gold generates no difference in the outcome of the gem, the outcomes are simply random.

The Gem Set found in Negative Rebirths allows a gem to be forged instantly after successfully completing the xp challenge regardless of how long it usually takes.

Infinity Blade III

Gem forging reappears in Infinity Blade III; however, the Gemcutter is a prerequisite. In Infinity Blade III, gem forging is now known as gemcutting.

Leveling Square and Circle Gems

Forging three capped (+400) square gems together yields a rare square gem (+500) and, similarly forging three capped (+400) circle gems together yields a rare circle gem (+500). Forging a rare square gem together with two non-capped square gems yields a higher-level rare square gem (similarly, for circle gems). The two non-rare gems cannot be capped, and must be at least +200 for square gems or +100 for circle gems. This process can be repeated indefinitely.

When this process is used, different kinds of gems level differently.