The 925 hallmark is indicative of 92.5% Sterling Silver.
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Hallmark 925 on a ring usually indicates that it is made of sterling silver, which is .925 pure silver mixed with other metals for strength and durability. White gold rings typically have a stamp indicating the gold purity (e.g., 14k or 18k) rather than 925.
You can determine if your ring is silver or white gold by looking for a hallmark on the inside of the band. Silver is usually stamped with "925" or "Sterling," while white gold is typically marked with "10K," "14K," or "18K." Additionally, white gold has a slightly yellowish tint compared to the brighter, whiter shine of silver.
The hallmark "375" on a white ring indicates the ring is made of 9 karat gold, meaning it is 37.5% pure gold. The "c2" could be a manufacturer's mark or additional information specific to the maker.
Your ring was probably made in England or another country that doesn't use our standards. In USA we mark items with KT such as 18KT. Your ring is probably 22KT gold. it is gold plated sterling silver In the UK we do not use 925 on gold or silver. We use a 'Hallmark' that is for every area of the UK from which it was made. This is helpful when 'pricing' antiques as the hallmark identifies the area, manufacturer and era from which it originated.
The hallmark 375 on a white ring typically indicates that the ring is made of 9 karat gold. The CZ likely stands for cubic zirconia, which is a synthetic gemstone used as a diamond alternative in jewelry.
A 925 stamp on a ring signifies that it is sterling silver, not white gold. The stamp "925" refers to the metal's purity level, which is 92.5% silver mixed with other metals. White gold typically carries a different stamp such as "14K" or "18K" to indicate its gold content.