China presents some of the best Olympic medals in history to the Beijing Olympic winners, organizing officials and medal producers said on Tuesday.
Incorporating jade from northwestern Qinghai Province and involving advanced technologies and enhanced management during the production, tests on the medals revealed that the purity of gold and silver reached 99.9 percent.
The Shanghai Mint under the China Banknote Printing and Minting Corp. made these medals awarded at 302 Olympic events to meet the standard of the International Olympic Committee (IOC), which has stipulated the material, identification, weight, size and etchings on the medals.
The IOC has strict stipulations on the material, identification, weight, size and etchings on the medals.
For instance, each medal must be at least 70 mm across and six mm thick, the coat of each gold medal must consist at least 6 grams of 24-carat gold, silver medals must contain at least 92.5 percent silver while bronze medals must be mostly made of copper.
To guarantee the quality of the medals, China made 45 experiments on each medal throughout the production process and weighed them before, during and after they were gilded.
In addition, all raw materials for the Beijing Olympic medals provided by the Australia-based BHP Billiton have passed the IOC examinations.
... continue to next news