Amazingly similar to the "Kryptonite Necklace" worn by Lana Lang in the upcoming Television series' "Smallville". In the pilot episode the Kryptonite on the necklace that is worn by Lana is a piece of the Green Meteor that killed her parents at the exact same time that Clark/Kal-el landed on earth(Smallville). The Kryptonite renders Clark Kent/Superboy "weak in the knees" and all of his schoolmates think that it's because Clark is madly in love with Lana and every time he gets close to Lana, he kind of falls apart. What ever the reason why Clark shows these signs around Lana, it IS a really cool necklace.