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Gold fineness indicates the proportion of pure gold in a jewelry alloy. For example, a fineness of 585 means that out of 1,000 parts by weight of the alloy, 585 parts or 58.5% are pure gold. In Lithuania, the standard gold finenesses are 375, 585, 750, 916, and 999.
The higher the fineness number, the greater the proportion of pure gold in the alloy. Therefore:
However, a higher fineness does not necessarily mean that the jewelry will be better suited for everyday wear. Other important factors to consider when choosing jewelry include the alloy’s properties, the jewelry’s design, thickness, intended use, and how often it will be worn.
Pure gold is a soft and highly malleable metal. For this reason, most gold jewelry worn daily is made not from nearly pure gold, but from gold alloys. Other metals are added to the alloy along with gold. These metals allow the mechanical properties and color of the alloy to be modified, making it suitable for various types of jewelry.
The fineness indicates the amount of pure precious metal per thousand parts by weight of the alloy. For example:
585 / 1000 = 58.5% pure gold. The remaining 41.5% of the alloy consists of other metals.
| Gold purity | Amount of pure gold | Approximate equivalent in carats | Where is it more common? |
|---|---|---|---|
| 375 | 37,5 % | 9K | In jewelry |
| 585 | 58,5 % | 14K | Very commonly in everyday jewelry |
| 750 | 75 % | 18K | In high-karat jewelry |
| 916 | 91,6 % | 22K | In high-purity gold items |
| 999 | 99,9 % | ~24K | Almost pure gold |
Important: The fineness indicates the amount of gold in the alloy, not the overall quality of the jewelry. Two rings of the same fineness can vary greatly in their construction, weight, craftsmanship, gemstones, and final value.
375 fineness means that the alloy contains 37.5% pure gold. In the karat system, this corresponds to 9K gold. The remaining 62.5% of the alloy consists of other metals. Since the proportion of pure gold is lower than in 585- or 750-fines alloys, a 375-fine piece will contain less pure gold than a piece of the same mass made from a higher-fine alloy.
However, fineness alone is not a reliable indicator of a piece of jewelry’s overall quality. The quality of craftsmanship, design, weight, and materials used are also important.
585 fineness means that 58.5% of the alloy’s mass consists of pure gold, while the remainder consists of other metals used in the alloy. In the karat system, 585 fineness corresponds approximately to 14-karat gold.
585-fine gold is extremely common in jewelry because it combines a significant amount of pure gold with the practical properties of the alloy.
It is used to make:
The Auksinės Svajonės wedding ring collection features many 585-fineness models.
If the mass of the ring’s gold alloy is 5 g, the theoretical amount of pure gold is calculated as follows:
5 × 0.585 = 2.925 g of pure gold.
This is a calculation of the alloy’s composition, not a formula for determining the value of the jewelry. If the piece contains gemstones or other materials, the total weight of the jewelry cannot automatically be considered the weight of the gold alloy.
750 fineness gold contains 75% pure gold. It corresponds to the 18-karat system. A 750 fineness alloy contains more gold, so it is chosen when a higher proportion of pure gold is important.
However, for an everyday ring, the highest fineness is not the only criterion. Durability is influenced by the specific composition of the alloy, the ring’s profile, thickness, construction, and wearing habits.
A 916 fineness means that the alloy contains 91.6% pure gold. This corresponds approximately to the 22K system. The purity of this gold is significantly higher than that of 585 or 750 fineness, but due to the higher proportion of gold, its properties differ from those of typical everyday jewelry alloys.
999 fineness contains 99.9% gold. It is often referred to as nearly pure gold and roughly corresponds to 24K. Due to the softness of gold, this fineness is not a typical choice for many rings worn intensively on a daily basis.
When making your choice, it’s worth answering three questions.
For a ring worn daily, it’s not just the percentage of pure gold that matters, but also practicality, construction, and durability for everyday use.
If you want a higher percentage of pure gold, you can choose 750 fineness. If you’re looking for a fineness commonly used in jewelry for everyday wear, consider 585 fineness.
Fineness and color are two separate choices. Gold of the same fineness can come in different colors, so you can first choose the desired fineness and then select the alloy’s shade.
If you can’t find the combination you want, when having jewelry custom-made, you can work with a jeweler to determine the appropriate metal, fineness, color, and design.
There is no single “best” gold fineness - the most suitable one depends on the jewelry’s intended use:
If you’re choosing an engagement ring or wedding bands, it’s worth considering not only the fineness but also the ring’s design and how it will be worn.
Gold purity can be measured using two systems:
It is important not to confuse gold karats (K) with the carat (ct), a unit of weight used for gemstones. The names are similar, but they are completely different measurements.
No. It is not possible to reliably determine the fineness of gold based solely on the color of the jewelry. White, yellow, and rose gold can all have the same fineness, such as 585 or 750. The color depends on the remaining composition of the alloy and the final finishing of the jewelry.
Therefore, when evaluating an unknown piece of jewelry, one should not judge its purity based solely on color.
If we were to compare gold alloys of the same weight, the alloy with the higher fineness would contain more pure gold. However, the final price of a piece of jewelry depends on more than just the fineness. It can be influenced by:
Therefore, for example, a lightweight 750-karat ring will not necessarily cost more than a heavier 585-karat ring set with gemstones. If you’re interested in having a piece of jewelry you already own appraised, you can find more information on the gold buying page.
Gold fineness helps you understand how much pure gold is in the alloy, but the right piece of jewelry is chosen by evaluating its construction, color, design, and the gemstones used.
Browse Auksinė Svajonė's wedding rings or contact us about custom jewelry if you’d like to choose the gold fineness, color, and design that are specifically suited to your piece.
