Question

why jewellery is made from silver gold and Platinum

Answer 1

because of there various properties like shine, luster, malleability, ductility and is found in minimum quantity in earth 
They are not very reactive in open atmosphere i.e almost inert metals 
All these metals are rare, which makes them more expensive.

Answer 2

Hi
This is your answer.

Jewellery is made from silver gold and Platinum because these are noble metals they do not corrode or lose their lustre in course of time. Moreover these metals are malleable and ductile and due to this these metals can be used to make various of designs easily.