[Indonesia] Jewelry attractions

I am an amateur jeweller. Creative lost wax work mostly. I am making
a one time trip to Indonesia from the US for work. Going to Pekanbaru
through Singapore. I have heard there are good deals on pearls, gems
and gold that I might be able to supply my hobbies with. But I dont
have a clue about finding this stuff down there. Anyone have
recommendations?

Thanks - Kelly