Identifying 14kt Gold & Diamond Rings: Understanding Hallmark & Markings

Question
I have a what i believe to be a 14kt white gold 5 stone diamond anniversary band with two burnished diamonds set in between each prong set diamond.  However, there isn't any 14kt marking inside the ring.  There is A/C and the letter C with a circle around it. Do you know what these mean?

Answer
HI LISA,

WHAT IS THE REASON YOU BELIEVE THE RING IS 14K AND DIAMOND? DID YOU BUY IT FROM A JEWELER WHO SAID IT WAS 14K AND DIAMOND? THERE SHOULD ALWAYS BE A QUALITY STAMP IN ANY RING BOUGHT IN THE U.S.A. IN THE LAST 50 YEARS. THE C WITH THE CIRCLE IS USUALLY A COPYRIGHT TRADE MARK STAMP IN MOST RINGS. THE A/C HAS NO SIGNIFICANCE OTHER THAN THE MFG.'S STAMP. I WOULD TAKE THE RING TO SOMEONE WHO CAN IDENTIFY THE STONES AND TEST THE GOLD. IF THEY PROVE NOT TO BE WHAT YOU THINK THEN THE PERSON YOU BOUGHT THEM FROM SHOUD BE CONFRONTED UNLESS IT WAS A GIFT AND IS A SENTIMENTAL PIECE. WHATEVER I HOPE YOU ENJOY ITS USE. GOOD LUCK.

PETER