This one is too new for the Promo Tokens of Nevada book as it's a centennial piece. I've seen them before, but not in the flocked box. The stone maarking the location of Las Vegas looks like a diamond, but who knows. It is also serialized, which is unusual for give-away tokens. It's a little smaller in diameter than the Silver strike tokens, and has no silver marking. The edge is reeded.

It seems to me there's at least one other token that has a stone set in it, but I don't think it was from Nevada.