Good questions. It looks like it alloyed with silver to me, but if it is still 14k, then it will tarnish some.........in 100 years or so.
Same with swassa, if 9k it will tarnish faster than 14k.
I am thinking yours is gold alloyed with silver instead of copper in 14k (I have a similar barong sleeve with the same mix of gold and silver and no tarnishing).
A jeweler can test to be sure (I've done that before without damage).