This is an oversized replica of the "one" ring put out as an impulse item at tower records. it's huge. it lights up. it's for Sauron! It measures about three inches across.
While not particularly detailed, I think it's a great gag because it lights up to reveal the elvish script. There's a big honkin' button on the inside of the ring to light the bad boy up.
Accurate? Heck no.
Cooler than a hill of beans? Heck yeah!