What is the material in the middle of Five Blessingg Silver Bowl?

The Five Blessingg Silver Bowl handed down from China is about 7 cm high, with a diameter of 12 cm and a foot height of 1.2 cm. The bowl is made of1000g sterling silver, with 25 natural diamonds and 75 precious jewels. The bowl body is engraved with the word "Fu" written by emperors in Tang, Song, Yuan, Ming and Qing dynasties, as well as auspicious patterns such as sea, precious flower, wishful flower and gourd, which mean "Fu, Lu, longevity, jubilation and wealth". The bottom of the bowl is engraved with the words "China Shengshi" and "Five Blessingg Silver Bowl". The width of the bowl means that all rivers run into the sea and the mind is broad; The continuous palindromes at the mouth and feet of the bowl symbolize wealth and prosperity; The abdomen is round and slightly bulging, indicating tolerance and blessing. The whole bowl is noble in shape, wonderful in conception and dazzling, and it is a treasure handed down from ancient times that combines royal momentum and good fortune.