I always wonder about the gem cutter and its noise level. The noise never seems to bother the sim that is using the gem cutter, but everyone else on the lot complains (as I noted in a previous post); even the zombies complain. It’s a good thing there isn’t an OSHA rep in the game or he’d make everyone wear ear protection.
So if you want your sim to use the gem cutter late at night but you don’t want to wake everyone on your home lot, load the uncut gems into your sim’s inventory and send your sim to Aleister's Elixirs and Sundries to use the gem cutter there. Don’t worry, the shop is always open and Aleister won’t charge any usage fees.