from Custom Optimus Prime Ring Has Ruby Eyes - Geekologie there's also a pic of a silver pendant. enjoy
well according to the article it is. i'm assuming the artist drew it and molded it out. then the client it took it to a jewelry shop and melted the gold together. client probably took it to the artist and showed him what it looked like. so i'm not sure jewelry is made so i'm probably 100 percent wrong.
You know, if they were going to use real rubies, you think they'd go through the effort to make sure he's not wonk-eyed like that.
Neat. If he has ruby eyes, wouldn't that make him Movie Nemisis Prime? I'm kidding. But, yeah sapphire would be a better choice.