It can be stamped as 14k, 14kt, or 585 depending on the place. Some countries do this differently.
"Plumb" or true 14K gold
It probably means plated with 14 karat gold.
That would be plumb gold, also expressed as 14kp. It is a mark indicating exactly 14 karats of gold, no less, no more. A mark of quality.
Metal that is plated in gold can not have the stamp.
CZ stands for the company that made the ring. A "CZ" can also be cubic zircon that is a man made gem/diamond.
Is the 959 stamp gold or silver
It is a stamp from Ghana - the former Gold Coast
it would stamp gold with 2,000,234,567,890,122,3,,4,,5,5,6,6,7,7,8,,0,0 which means $52
Gold electroplate. Not gold.
14 carat gold
62.5 % gold
Gold stamps are worth the least amount of money. If you get a green stamp it is worth a couple hundred dollars. The black stamp is priceless.