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A 525 stamp indicates that the metal in the stamped piece is 52.5 percent gold. This is the same thing as the marking 14K for 14 karat gold.
White gold
It means that the piece of gold jewelry has a content of 58.5% gold, which is 14kt gold.
The pgda means that the piece came from Piercing Pagoda. 10K means that the piece is ten karat gold, it is real gold.
Gold clad (gold plated)
14kt soild gold
750 is the marking for 18 KT Gold, and most likely FB is the hallmark of Franz Breuning. Is it a modern looking piece?
The stamp 800 on gold jewelry likely means that the piece is old and not from the United States. The 800 denotes the amount of gold in the piece.
white with yeller gold
The symbols S51 on a 14k white gold ring illustrate the purity of the gold.
The "KGS" stands for "Karat Gold Shell". The piece isn't solid karat gold , it rather has a type of gold plating on it instead.
The initials K.P. when found on a piece of gold jewelry indicate that the piece of jewelry is not one hundred percent gold, but only plated with gold. K.P. stands for "karat plate."