Jewellery calculator
Choose jewellery type, adjust the weight and karat, and see the metal value at today's gold price — plus what different payout percentages give.
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Metal value
1 × necklace of 12,0 g in 585
The weights are indicative averages for Danish jewellery. Stones, pearls and clasps made of other metal don't count towards the gold weight — always weigh the item yourself before selling.
The value of 1 necklace in 585 over time
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Net gold weight: gemstones are not included
When assessing the value of a gold item of jewellery based on metal content, it is the net weight of the gold itself that is relevant, not the total weight of the piece. Diamonds, other gemstones, pearls, and any non-gold components such as steel clasps must be subtracted before calculating the gold value.
In practice, this means that an assessment based solely on the total weight of a piece set with stones will significantly overestimate the gold content. A correct assessment requires either removing the stones, using a recognized method to estimate stone weight, or having an experienced goldsmith or appraiser make the estimate.
Gold alloys: 585 and 14 carat explained precisely
The '585' stamp indicates a gold purity of exactly 58.5% pure gold, with the remainder being other metals such as copper, silver, or zinc, depending on the desired colour and hardness. This figure is a direct and exact statement of gold content.
The carat designation '14 carat' is based on a scale where 24 carat is pure gold. 14/24 corresponds mathematically to 58.333% gold, slightly less than the exact 585 figure. In practice, 585 and 14 carat are used as terms for the same alloy, but one should be aware of the small numerical difference between the nominal fraction (58.333%) and the stamped value (58.5%), which arises from rounding conventions in the standards.
Other common alloys and stamps
In addition to 585/14 carat, stamps such as 333 (8 carat, 33.3% gold), 750 (18 carat, 75% gold), and 916/917 (22 carat) are also seen in Denmark. Each stamp indicates a nominal fineness, which may deviate slightly from the actual composition within legal tolerances.
When assessing jewellery, it is essential to correctly recognize and distinguish these stamps, since confusing, for example, 333 and 585 produces markedly different gold values for the same gross weight.
Design and collectible value are assessed separately from metal value
The total value of a piece of jewellery can be significantly higher than its pure metal value if it was designed by a recognized goldsmith, is a rare vintage piece, or has artistic and craftsmanship significance. This added value cannot be calculated from weight and alloy alone.
Assessment of design or collectible value should be carried out by a specialist familiar with the relevant market, such as an auction house expert or a certified appraiser, separate from the pure metal valuation based on weight and fineness.
When buying or selling used gold jewellery, it is also recommended to obtain an independent assessment if the item's value is assumed to significantly exceed its pure metal value, since such an assessment requires specialized expertise that a simple weight and stamp check cannot replace.
When comparing several pieces of jewellery with the same stamp, it is also important to weigh each piece separately, since even items with identical carat markings can have different net gold weights due to varying amounts of non-gold material, such as filler in hollow chains or different quantities of set stones.
Questions and answers
Do my diamonds count toward the gold weight?
No, gemstones and other non-gold materials must be subtracted before calculating the net gold weight.
Are 585 and 14 carat exactly the same figure?
They are used as the same term, but 14/24 gives exactly 58.333%, while the 585 stamp indicates 58.5%.
What does the 333 stamp mean?
It indicates 8 carat gold, equivalent to 33.3% pure gold.
Can I determine myself whether my jewellery has high collectible value?
It is recommended to have a specialist assess design and collectible value separately from the metal value.
Why does the alloy colour vary at the same carat?
The colour depends on which other metals are alloyed with the gold, such as copper or silver.
Is every 585-stamped item legally verified?
Stamps indicate nominal fineness; an actual verification requires testing by an expert or an assay office.