gallium is an element
Maybe in an alloy, but definitely not on its own. The melting point of gallium is only 29 oC, which is below body temperature, so a gallium ring could melt off your finger on a warm day. Gallium is an attractive looking metal, but it's too reactive to have much ornamental use. It could be sealed inside something transparent to stem the reactivity and keep it from running away in liquid form. Glass could work if care was taken to allow space in the chamber for the metal to expand when it solidifies in cooler temperatures.
you can make jewelry
gallium and arsenic
no
For example, gallium arsenide (GaAs) is used from many years in laser diodes.
they wear wood beads.they carve them out of various barks in the forest
Being radioactive and dangerous it is impossible to use americium for jewelry.
gold and feathers
they use wampum
yes, you can, it won't make a difference.
Gallium arsenide is used to make LEDs and LASER diodes. Best not to "bump" into it.