You see numbers stamped on your jewelry — 750, 585, 417, 925, 916. You know they mean something about the metal, but you're not sure what. You want to understand what these marks can tell you and what they cannot.
Look up the mark. It tells you the gold content. That tells you what the piece is worth.
"Is knowing the metal purity enough for your current decision — or do you need to know more?"
Use the mark as one piece of information. Combine it with what else you can observe — other marks, construction quality, style, condition — to build a fuller picture. Don't let one number tell the whole story.
750 is a fineness mark indicating 18-karat gold — 75% pure gold, with the remaining 25% being other metals for strength and color. This is a standard international mark recognized by assay offices worldwide. It tells you the gold content. It does not tell you the maker, age, or authenticity.
585 indicates 14-karat gold — 58.5% pure gold. This is the most common gold purity in the United States for fine jewelry. It offers a good balance of gold content, durability, and cost. Like the 750 mark, it confirms purity but not maker, age, or value.
Yes. 417 indicates 10-karat gold — 41.7% pure gold. It is the lowest purity that can legally be sold as gold in the United States. It contains less gold than 14k or 18k but is more affordable and durable. It is real gold — just less pure.
The difference is gold content: 10k = 41.7%, 14k = 58.5%, 18k = 75% pure gold. Higher karat means richer color, softer metal (more prone to scratching), and higher melt value. Lower karat means more durability, lighter color, and lower cost. The best choice depends on how the piece will be worn.
