Brisbane hacker space is currently running course with RABKA Gold & Silversmiths to create rings and pendents out of silver. They train 10 people in a 4 hour course at a cost of $115 per person bookable through Eventbrite. You can also probably organise at private class for you group by contacting RABKA Gold & Silversmiths.
The class was quite interesting with looks of different technicians to learn. You start with a long peace of silver that you then heat with a blow torch then cool of and bend and cut into a shape resembling a ring. When you have ring like shape you then solider metal into the join and then hit the ring with a special hammer till it is the size you want it to be to fit your finger.