It means 'back and front', an indication the item is plated (either gold or silver).
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.
The stamp mark "750" on a gold earring indicates that the piece is made of 18-karat gold, meaning it contains 75% pure gold and 25% alloy metals. The "AJ" likely represents the manufacturer's or designer's initials or logo. This marking helps identify the quality and authenticity of the gold jewelry.
The gold stamp "188CN" typically indicates the purity and origin of a gold piece. The "188" suggests that the item is made of 18.8 karat gold, which contains approximately 78.3% pure gold. The "CN" may denote the manufacturer or the country of origin, often associated with China. This marking helps consumers identify the quality and authenticity of the gold item.
I have a 9ct gold ring (with pink sapphires) which has this marking on it, it is made by Angus & Coote jewellers. **375 stamp means 9ct gold - 37.5% pure gold, or 375 parts per 1000. This can be stamped on white gold or yellow gold. 585 is 14ct gold, 750 is 18ct, and 1000 is 24ct or PURE GOLD. Guessing AC16 is Angus & Cootes stamp.
14 carat gold
62.5 % gold
Gold electroplate. Not gold.
gold
925 is a standard marking for Sterling Silver, thus making it a silver ring, not gold.
The BX stamp on a ring is probably just a jeweler's signature marking. It does not indicate value or purity of the ring.
375 is the marking for 9 carat gold. Usually vintage European will have this marking.
The Stamp YAG Means Gold Coated Silver