I found out pretty useful tool which shows the chances of upgrading the gem on diablofuns website.
Here is the picture for levels 1-25. The chances remain the same for all levels.
Diablo 3 - Gem Upgrade Chance
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I found out pretty useful tool which shows the chances of upgrading the gem on diablofuns website.
Here is the picture for levels 1-25. The chances remain the same for all levels.