The Jeweler's House was initially available at L20, that changed with an update in September of 2016. It is now available for purchase at L25. Building Tips:
Check Neighbors for a Large Library. These will drop Knowledge each time
You will need a Lumber Mill upgraded to L3 for Poles to make Magic Wand, Poles can sometimes drop from any level Lumber Mill at neighbors but they are very rare. It is faster & easier to run your own Lumber Mill
You will need a Mine L3+ or a Large Mine for Precious Stones that are required to begin Production on the Jeweler's House
The Jeweler's House had it's timer reduced from 15h to 5h with a May 2017 update!