@rostsit & @mrtun3r , Since I hadn't had an Alien die in my game yet, I was more focusing on the alien shape of the tombstone and not the gold color. Sorry about that! 😳
I was thinking that maybe your Sim had perhaps fulfilled their Aspiration, but then I remembered that I had a Sim die by fire, and the urn was gold! 🤨 I have kept it inside, so I never saw it as a tombstone. (I will try moving it an see what happens!) The Sim was a regular young adult Sim who hadn't lived very long. I was testing out the Day of the Dead items so I was trying to get a Sim to die.
Update: I went back to that same family that had the gold urn and the Sim that died by fire. When I moved her urn to the outside, it just became a regular tombstone, not a golden one. 🤨 I'm not sure why! 🤔
First is a picture of the urn
Second is a picture of the tombstone: