Once you finally get enough diamonds to finish round 1 of renovation Alchemy Workshop will be open
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Prices:
1k
2k
10k
20 Gold
20 Gold
40 Gold
??? unknown after that

At this point it is my understanding that the stuff you can buy for this is broken, IE nothing to actually use this stuff on. Worth stocking piling until they fix it? No idea.

Round 2 of renovation up next (at level 95)