Tibet and Bali are very different parts of the world. Beads from Bali, Indonesia are usually at least 92.5% silver. "Bali Style" is the name most of us use for beads that look like Bali beads but are made in other parts of the world.
So called "Tibetan Silver" is probably NOT made in Tibet and most likely contains NO silver at all.
Some "Tibetan Silver" sold out of China is cast from lead based pewter. Some "Tibetan Silver" may be cast from Zinc alloy. Some "Tibetan Silver" is an alloy of copper and zinc.
If you google the phrase "What is tibetan silver" you can see more articles supporting this. Watch out for sellers sites with descriptions like "some parts silver, and mostly copper and other metals." Those don't say the actual % of silver so you have to assume there is ZERO% silver.
"Tibetan Silver," German SIlver, and Nickel Silver are just names for silver/white colored metal that contain NO silver.