It stands for 14 cart Gold Plate.
It means that the item is not gold, but is some other metal which has been coated with a thin coating of gold.
Pure gold is 24 carat, and is soft, the lower the number of carats the less pure the gold but the harder it is.
14K GP means fourteen karat -- gold plated.
it means 14 karat gold plated
The gp means gold plated.
Grandmas Platinum and sapphire bracelet looks priceless, but the OB 14k means that it is 14k gold "overband" or later known as electroplate or 14k GP for Gold Plated. Crushed i set out to prove that at least we had sapphires. Alas, a pin scratched the gem which should be second only to diamond in hardness. Sorry to disappoint you, but your jewelry is old, but also not worth a lot, aside from sentimental significance.
STS is a jewelry company, so that's the maker's mark. 14K means it's 14/24 karat (58.5%) gold, unless it's followed by GP, HGE, GEP, or something similar.
GP- General Purpose
it stands for 14, 000 gallons per minute!
General Purpose
Gold Plated
Normally GP in any scorebook stands for Games Played.
Football Gaming Podcast footballgp.blogspot.com
Might be Gross Profit.