Gold plating thickness is the question nobody tells you to ask

Two gold chains can look identical in a photo and cost the same — and one will still look flawless in three years while the other fades to a dull grey by month four. The difference almost always comes down to one specification most brands quietly leave off the product page: how thick the gold layer actually is, and how it was applied.

Thickness is measured in microns (one micron = one-thousandth of a millimetre). It sounds like a detail for jewellers, but it is the single best predictor of how long a gold-plated piece will hold its colour. This guide explains what the numbers mean, why the application method matters as much as the thickness, and how to buy a gold chain that still looks like gold years from now.

What a micron actually is (and why it decides everything)

A micron is a unit of thickness. When a piece is described as "0.5 micron gold plating," it means the gold layer sitting on top of the base metal is half of one-thousandth of a millimetre deep. That is thinner than a human hair by a wide margin, which is exactly why plating thickness matters so much: there is very little gold there to begin with, so small differences in depth translate into large differences in how long the finish survives daily wear.

Every gold-plated piece is built the same way in principle: a base metal core, then a thin layer of gold bonded to the surface. The colour, the shine and the luxury all live in that top layer. Once it wears through, the base metal shows and the piece is finished. So the real question when you buy is never just "is it gold?" — it is "how much gold, how hard, and how well attached?"

The gold plating thickness scale, decoded

Here is what the common thickness tiers mean in the real world. Treat these as the honest translation of terms you will see on product pages:

• Flash plating (under 0.25 micron): The thinnest possible layer, used to add a fleeting gold tint to fashion jewellery. It looks great in the box and often wears off within weeks. This is what sits behind most "gold" pieces sold for a few dollars.
• Standard plating (0.5 micron): The industry baseline for affordable gold jewellery. Fine for occasional, careful wear, but it will not survive constant contact with skin, sweat and clothing for long.
• Heavy gold plating (2.5 microns and up): The threshold at which a piece can genuinely be worn often. Thicker gold means more material to wear through before the base shows, which is why serious everyday pieces aim for this range or above.
• Thick / premium plating (5 microns+): Reserved for pieces built to last years of daily wear. More gold, more cost, more longevity.

As a rule of thumb: below 0.5 micron is decorative, 2.5 microns and above is where "buy it once" begins. But thickness alone is only half the story — and this is where most buyers get misled.

Why the application method matters more than the number

A 1-micron layer applied one way can outlast a 2.5-micron layer applied another. The reason is that not all gold coatings are created — or bonded — equally.

Standard electroplating

Traditional gold plating uses an electric current to deposit gold onto the base metal in a chemical bath. It is fast and inexpensive, which is why most gold-plated jewellery uses it. The weakness is adhesion and hardness: an electroplated layer is relatively soft and sits on the surface rather than fusing deeply into it, so friction, sweat and time gradually lift and wear it away.

PVD (Physical Vapour Deposition)

PVD is the method used on luxury watch cases, surgical tools and high-end jewellery. The gold is vaporised in a vacuum chamber and bonded to the metal at a molecular level, creating a coating that is dramatically harder, more scratch-resistant and more corrosion-resistant than electroplating of the same thickness. That hardness is the point: a PVD finish resists the everyday abrasion that eats through softer electroplated layers, so it holds its colour far longer even without being thicker.

This is exactly the process behind every gold piece at The Flaire — 18K gold PVD bonded over a 316L stainless steel core. It is why our pieces are built to be worn in the shower, at the gym and in the ocean without fading, and it is the reason a Flaire chain outlasts the standard electroplated pieces sold at a similar price. If you want the full breakdown of the process, see our guide to what PVD gold plating is and why it outlasts standard plating.

Thickness vs. the base metal underneath

The gold layer gets all the attention, but the metal it sits on decides whether your piece survives water and sweat. A thick gold layer over a cheap, reactive base metal is still a problem: once any moisture reaches the base, corrosion begins from underneath and pushes the plating off.

This is why the core matters as much as the coating. The Flaire builds on 316L stainless steel — the same corrosion-resistant, hypoallergenic grade used in medical implants and marine hardware. It does not rust, it does not react with skin, and it gives the PVD gold a stable, non-reactive foundation to bond to. Thick gold over the wrong base is a countdown; PVD gold over 316L steel is built to last. For more on the material itself, read our honest take on whether 316L stainless steel jewellery is any good.

How to buy gold plating that actually lasts

You will rarely find the exact micron count printed on a product page, so use these signals instead:

• Look for the method, not just the metal. "PVD" and "ion plating" signal a harder, longer-lasting finish. Silence about the method usually means standard electroplating.
• Check the base metal. 316L stainless steel is the gold standard for a waterproof, non-reactive core. Vague "alloy" or "brass" bases are a red flag for anything you plan to wear daily.
• Read the warranty. A brand's confidence in its plating shows in what it guarantees. A real warranty against fading is a stronger signal than any number.
• Trust the wear reports. Verified reviews from people who have worn a piece for months tell you more than a spec sheet ever will.

On that last point: The Flaire is backed by a 4.57★ rating from over 4,500 verified customers — you can read the real, unedited feedback on our customer reviews page. Every gold piece is covered by a 1-year warranty and a 30-day return policy, because we build them to be worn, not babied.

The bottom line on gold plating thickness

Thickness matters — aim for heavy plating (2.5 microns+) territory rather than flash or standard when a piece will see daily wear. But the smarter question is how the gold was applied and what sits underneath it. A hard, molecularly-bonded PVD finish over a corrosion-proof 316L steel core will outlast a thicker electroplated layer over a reactive base every time. Buy for the method and the base, not just the number, and you buy a piece that still looks like gold years from now. (For a realistic timeline, see our honest guide to how long gold-plated jewellery actually lasts.)

Ready to see it in person? Explore the full gold jewellery collection — every piece is 18K gold PVD over 316L stainless steel, and every piece is built to last.

Frequently asked questions

How many microns of gold plating is good?

For everyday wear, look for heavy gold plating of 2.5 microns or more. Anything under 0.5 micron is decorative and will wear quickly. That said, a harder PVD coating can outlast a thicker electroplated one, so weigh the application method alongside the thickness.

Is PVD gold plating thicker than normal plating?

Not necessarily — PVD layers are often a similar thickness to electroplating. The advantage is hardness and adhesion: PVD gold is bonded at a molecular level and is far more scratch- and corrosion-resistant, so it holds its colour much longer at the same thickness.

Does thicker gold plating mean it won't tarnish?

Thicker gold delays wear-through, but tarnish and corrosion usually start from the base metal, not the gold. A non-reactive core like 316L stainless steel is what actually prevents corrosion, which is why the base metal matters as much as the plating depth.

How thick is the gold plating on The Flaire jewellery?

The Flaire uses 18K gold applied by PVD (Physical Vapour Deposition) over a 316L stainless steel core. The PVD process creates a hardened, molecularly-bonded finish that is waterproof and tarnish-resistant, backed by a 1-year warranty against fading.

Can I shower and swim in PVD gold-plated jewellery?

Yes. Because The Flaire's pieces use PVD gold over waterproof 316L steel, they are made to be worn in the shower, at the gym and in the ocean without fading. Rinse with fresh water and dry after heavy exposure to keep them looking their best.