After beeing abscent from the game for quite some time ,I recently read the latest patch notes which inform of a greatly increased chance of success in compounding lesser jewels. Though there has indeed been an increase in that success rate ,Failure is still often and very annoying after having spent quite some time and effort in the gathering of the requested materials. The price of the latter has also been increased possibly as a consequent of their success increase in compound. My suggestion is this , Up the price of the jewels to whatever amount you see fit and make the compound rate of All level Jewels 100%.