It is not a rose cut stone,they have a flat back and a pointed top.
Chip inlay,needs a real test for sterling.A magnet only tells you if the metal is ferrous or not.
A photo of the front of the piece could help.
This is what the original rhodolite looks like,discovered in the Cowee valley North Carolina.[ATTACH]
Does the mokume bracelet have a maker's mark?
Do not do anything to the rust on the handle area!!!!
Synthetic sapphires have been available since 1902.
Poorly soldered jump rings and finish,probably made by a hobbyist.
At one time the manufactures changed the font on the Sterling tools,I don't know when it happened.
A number of garnet types will glow under a UV light. Any comments welcome.
Looks like the black part is niello...... https://en.wikipedia.org/wiki/Niello
It could be nickle silver.... nickle,copper and zinc.
It looks like the stone is glued onto the back plate.Most of the maker's I know never have an open back on pendants.
If the cap is plastic it will feel warm,if it is glass/quartz it will feel colder.
Looks like a triplet,appears to have air bubbles between 11 and 12 o'clock.
Separate names with a comma.