Twenty-four-karat gold is a beautiful metal and a poor jewelry metal. It scratches under a fingernail, bends in a pocket, and prongs closed in 24k will not stay closed. Every ring a customer actually wears is an alloy—gold mixed with copper, silver, zinc, palladium, or nickel—and the ratio of those additives is what changes the color, the hardness, the melt point, and the price. Specifying "14k yellow" is not a complete order; specifying the alloy behind it is.
What karat actually means
Karat is parts gold out of 24. 18k is 75.0% gold; 14k is 58.3%; 10k is 41.7%. The remainder is the alloying package. Within a single karat there is a wide range of possible colors and mechanical properties, because the alloying metals are chosen for the job.
Yellow gold: copper and silver do most of the work
Classic yellow gold is gold diluted with copper and silver. Copper deepens the color toward orange and adds hardness; silver lightens it toward a paler, greener yellow. A 14k yellow alloy with more copper reads warmer and is more prone to tarnish and skin reactions in sensitive wearers. A 14k yellow alloy with more silver reads paler, solders more cleanly, and is the common choice for fine jewelry that will sit next to skin for years.
Zinc is added in small amounts to lower the melt point and improve castability; it is not a colorant.
Rose gold is copper-forward
Rose or pink gold is gold with a high copper share and almost no silver. 18k rose carries more gold and less copper, so the pink is soft and the metal is still relatively soft. 14k rose is more copper-dense, reads deeper pink, and is harder—but it also tarnishes more, and the copper can leach onto skin in humid climates. That is not a defect; it is the alloy, and buyers should know it before promising a customer a piece will never darken.
White gold is not "gold painted white"
White gold is gold alloyed with white metals—traditionally nickel, today more commonly palladium, with zinc and silver tuning the color. Nickel white gold is hard, cheap, and has a known allergy share. Palladium white gold is softer, more expensive, hypoallergenic, and has a warmer gray tone that many manufacturers then rhodium-plate to bring to a bright white. The rhodium plate on a white gold ring is a thin cosmetic layer, not the metal itself; it wears off over one to three years on a daily-wear ring and has to be reapplied.
Hardness and wear
As a rule, lower karat is harder because the alloying metals are harder than pure gold. 14k rings wear better than 18k rings on a daily basis, and 18k wears better than 22k. The tradeoff is color richness and value density. Engagement rings that will be worn every day are commonly built in 14k or platinum; statement pieces that live in a box are often 18k because the color is deeper.
How this differs from platinum
Platinum is not a gold alloy—it is nearly pure platinum, alloyed with small amounts of copper, cobalt, or iridium to tune hardness. It does not yellow, so it never needs rhodium plate. It is denser, so the same ring in platinum weighs more and costs more per piece. Buyers comparing 18k white gold to platinum often pick platinum for bridal because of the no-plate promise, and pick 18k white gold for price. Both are valid; the spec sheet should name which one is on the bench, because the two metals are worked with different tools, different solders, and different finishing compounds.
Allergies and skin reactions
Copper and nickel are the two metals that drive the most skin reactions. Copper in rose and yellow gold can leach onto skin in humid conditions, leaving a greenish mark; this is cosmetic, not dangerous, but it bothers customers. Nickel in traditional white gold is a more genuine allergy trigger, affecting a measurable share of wearers. Palladium white gold solved most of the nickel problem, and sterling silver with a copper share behaves similarly to rose gold on sensitive skin. For retailers selling to a market with a high share of sensitive wearers, specifying palladium white or 18k yellow on the spec sheet is a product decision that reduces returns, not just a material preference.
Specifying an alloy on a PO
A clear order line reads more than "14k yellow." It names the alloy family—nickel white, palladium white, classic yellow, rose—and the intended use. That tells the foundry which grain to melt and which solder to use, because solders are alloy-specific: a 14k yellow solder will not flow cleanly on an 18k rose shank. Mismatched solder is a real, and expensive, production error.
For buyers building a program, the alloy conversation is the first one. It sets the price, the color, the care instructions, and the re-plating schedule. Our gold material guide lays out the standard alloys we stock, and the ones we melt to order for runs that need a specific color match.
EU-wide limits on nickel, lead and cadmium in jewellery are set by the REACH Regulation (EC) No 1907/2006 on EUR-Lex.
Frequently Asked Questions
What gold purities and platings do you offer?
Solid 10K, 14K and 18K, plus gold-filled and vermeil. Plated fashion lines use 1–2 micron PVD over brass or 316L.
How do I avoid mislabeling gold products?
Label by construction: solid, gold-filled, vermeil or plated. Mislabeling plated as vermeil is the most common compliance complaint in this category.
Can you stamp karat marks?
Yes. Every solid-gold and vermeil piece is stamped with karat and maker marks, which supports customs and resale claims.
What is the MOQ for gold lines?
50 pieces per design for stock settings; custom CAD work starts at 100 pieces.
