gold, jade and shiny

Since Michael Phelps won his first gold at these Olympics, I’ve been curious about the material and weight of the medals. Are they solid? Plated? How much are they each worth?
I found many of the answers to my questions here (via Pret a Voyager). I had no idea that the reverse side of the Beijing Olympic medals are inlaid with jade. Did you?
The medals are 70mm in diameter and 6mm in thickness. On their obverse side, the medals adopt the standard design prescribed by the International Olympic Committee (IOC) — a drawing that represents the winged goddess of victory Nike and Panathinaikos Arena, while on their reverse side, the medals are inlaid with jade with the Beijing Games emblem engraved in the metal centerpiece.
Noble and elegant, the medals are a blending of traditional Chinese culture and the Olympism. It gives the winners of the Games great honor and acclamation as recognition of their achievement.
The IOC has strict stipulation on the Olympic medals’ material, identification, weight, size and drawing. The medals for the champion and the runner-up are made of pure silver, and the champion’s medal must be plated with gold weighing not less than six grams each. For the first time jade is used for the Olympic medals. The design not only meets the IOC requirements, but also expresses praise and honor that the Chinese people cherish for the Olympic Spirit and the Olympic athletes.
(image source)