I farm jewels all the time at 86 maps, but it feels like you don't get much from using them.
Best you can get is Standart jewel, and that is pretty rare.

Can we make jewel elixirs drop jewels from Weak Jewels up to Excellent Jewel (rare)?
Cus we mainly get Cracked one and we will need 177,147 Cracked Jewels in order to craft a single Corrupted Jewel once it is release to the crafting station.