In Lords Mobile Gem Harvesting research increases the speed your troops can harvest gems from gem tiles. It is found in the economics tree.
There are 10 levels in total and once maxed you will have increased your gem harvesting speed by 10%. Each level requires you to have researched weight training and resource harvesting to the same level first.
The table below has the resource cost and time to upgrade each level. It also shows the might and rewards granted. You can find out your own research time by using our research calculator.
Gem Harvesting Research Requirements
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