It's low grade silver
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Yes, 333 is a gold hallmarked of 8 karat gold. It means that the gold piece is 33.3% pure gold and the rest is made up of other metals. This is a lower gold purity than 14k or 18k white gold.
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.
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.
The hallmark for 18ct gold is typically "750," indicating that the gold is 75% pure gold. This hallmark is often accompanied by a specific symbol or maker's mark to further identify the origin of the piece.
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.