I have a gold bangle that I bought that tested as 8k gold. What exactly does that mean? I know it's the lowest grading for gold. Will it end up tarnishing like plated gold? I didn't pay much for it ($25) and it's a very cute simple bangle style that I have been wanting forever but couldn't see paying $500+ for 14k to bang around at work. Also is it safe to clean in the same cleaner as I use for my 10k jewelery?