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Precious metals are not valued for rarity alone. They are also the most durable, lasting, and workable materials a ring can be made from, which is why the same few metals have carried diamonds for centuries. Here is the honest guide to all of them: yellow, white, and rose gold, platinum, and palladium, and how to choose among them.
Gold purity is measured in karats, written k or kt, and the first thing to settle is that karats have nothing to do with carats. Carats, with a c, weigh diamonds. Karats grade gold: pure gold is 24 karats, and jewelry gold is an alloy, gold blended with other metals for strength and color. The two alloys that matter are 18k, which is 75 percent gold, and 14k, which is 58.3 percent gold and the most common alloy in the United States.
The blending is not a compromise; it is the engineering. Pure gold is too soft for a ring worn daily, so the alloy trades a measure of purity for the hardness a lifetime demands. United States law sets the floor at 10k: anything below it cannot be marked or sold as karat gold at all. Every honest piece states its purity in a stamp inside the band, and reading that stamp is covered at the end of this page.
Yellow, white, and rose gold are the same precious metal wearing three different alloys. The gold content is identical at a given karatage; the companion metals set the color.
Gold in its own color, warmed by its traditional alloy. 18k carries the richest, most saturated tone along with the strength to last a lifetime; 14k trades a little of that saturation for a slightly harder wearing alloy. This is the metal of heirlooms, and it flatters warmer skin tones especially well.
Gold whitened with paler metals in the alloy. At RockHer the whitener is palladium, a platinum group metal, rather than nickel, because nickel is what most metal sensitive skin reacts to. White gold is typically finished with a thin rhodium plating for its brightest white; that layer wears with daily life and is replated periodically to look new.
Copper in the alloy gives rose gold its delicate peach blush, available in 18k and 14k like its siblings. The color is quietly distinctive on its own and remarkable in two tone designs, where its warmth plays against platinum or white gold. It also needs no plating; the color runs all the way through.
24k is pure gold, too soft for daily jewelry. 18k, stamped 750, is 75% gold: the luxury standard, richest in color. 14k, stamped 585, is 58.3% gold: the American standard, hardest wearing of the fine alloys. Below 10k, an alloy cannot legally be called karat gold in the United States.
Platinum is the most precious of the jewelry metals, and its virtues are structural before they are visual. It is remarkably workable yet extraordinarily durable, which is why platinum prongs hold diamonds more securely than any other metal: struck against a counter, platinum moves rather than wearing away, so the prong that holds your diamond keeps its grip for decades. Its strength also permits designs that are delicate and strong at once, details no gold alloy could carry as thin.
It is genuinely rare; all the platinum ever refined in history would fill barely a single pool to ankle depth. It is naturally white all the way through, so it never needs plating and never changes color. It is hypoallergenic, the definitive choice for anyone with metal sensitive skin. And it is dense: a platinum ring weighs about 60 percent more than the identical ring in 14k gold, a heft many wearers read, correctly, as permanence you can feel.
Purity standards run higher for platinum than for gold. Every RockHer platinum piece is made with 950 parts platinum per thousand, 95 percent pure, and stamped 950 to say so. Look for that stamp on any platinum piece you ever buy; it is what guarantees both the purity and the hypoallergenic property you are paying the premium for.
Palladium is a platinum group metal with platinum's essential character: rare, lustrous, naturally white throughout, hypoallergenic, and worked at the same 95 percent purity. What it lacks is platinum's density, and that is precisely its use. Being lighter makes palladium the intelligent choice for earrings, where platinum's heft works against all day comfort, and it brings the platinum family's virtues in at a more approachable price.
Because it is white to the core, palladium never needs the rhodium replating that white gold does; it is the same color on the day it is made and twenty years later. It is also quietly present across this entire guide, since palladium is the whitening metal inside RockHer white gold. Compared with white gold at the same price class, palladium simply contains more precious metal.
| Metal | Purity | Color | Character |
|---|---|---|---|
| 18k Yellow Gold | 75% (750) | Rich warm yellow | The heirloom standard; richest color with lifetime strength |
| 14k Yellow Gold | 58.3% (585) | Soft yellow | Hardest wearing gold alloy; the American standard |
| White Gold | 75% or 58.3% | Bright white, rhodium finished | The platinum look at a gold price; replated periodically |
| Rose Gold | 75% or 58.3% | Peach blush | Distinctive and romantic; color runs throughout, no plating |
| Platinum | 95% (950) | Natural white throughout | Most secure grip, heaviest, hypoallergenic, never replated |
| Palladium | 95% (950) | Natural white throughout | Platinum's virtues, lighter and more approachable; ideal for earrings |
Set the color preference aside for a moment. These three practical questions usually settle the decision before taste even has to vote.
Most reactions are to nickel. If there is any history of sensitive skin, choose platinum or palladium at 95 percent purity for anything worn daily, and know that RockHer white gold is alloyed with palladium instead of nickel, the safer middle path.
White gold delivers its brightest white through rhodium plating that wears and gets renewed every few years. Platinum, palladium, yellow, and rose gold are their own color forever. Neither answer is wrong; one asks for occasional maintenance and one never will.
For a significant center diamond worn every day, platinum prongs are the most secure setting metal there is, because platinum displaces rather than wears when struck. Many of our rings pair a platinum head with a gold band for exactly this reason.
The metal deserves the diamond it holds. Every stone we recommend is scored by ROSI™, our gemological intelligence, built by our gemologists. Request a ROSI™ Score Report on any diamond, ours or anyone else's.
The metal is the part of the ring she touches every day. Choose it for her hand, not for the display case.
Every metal in this guide is a fine choice, which is exactly why the decision should be made on her terms: her skin, her tolerance for maintenance, her color against her other jewelry, her days. Pay the platinum premium where it buys something real, security for an important diamond and immunity for sensitive skin, and spend confidently on gold where color and warmth are the point. The stamp inside the band will tell the truth about whichever you choose; make sure it is there, and make sure it reads the way this page taught you.
Found a diamond you are considering, here or anywhere else? Send the GIA or IGI certificate number and our gemological team returns its ROSI™ Score and a read of where it sits in the current market. Complimentary, within minutes.
Score a DiamondWhere stones of the same exact specifications are trading on the open market right now. You get a straight answer, even when the diamond is not ours.
John Anderson, our Lead Gemologist, walks couples through this exact decision every day: sensitivity, upkeep, color against her jewelry, and where the platinum premium is worth paying. Tell him about her and the ring you have in mind, and he will give you a straight recommendation. The consultation is complimentary and there is no obligation.
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