When I was drilling a hole, I found a 531,000g Gigantic Space Rock that was put in my inventory. I wondered how in the world my Sim could carry something I knew was at least half a ton. Afterwards, I found some Soulpeace and Pink Diamond gems and placed that mammoth rock at the front of my house. I don't have much space to drill in, but that's what I get for using up 98.5% of my alloted space for the house itself.