18K Gold Vermeil: what it is, and why 3 microns change everything

A gold ring costs 40 euro on one site and 162 euro on another. From the outside they look the same. Six months later, one of them no longer does.

The difference is not the brand. It is the thickness of the gold, measured in microns — a unit almost no shop mentions, because most would rather not.

What “gold plated” actually means

Most gold jewellery is not made of gold. It is made of another metal, covered with a layer of gold so thin it is measured in thousandths of a millimetre.

That layer is the plating. How thick it is decides whether the piece looks the same in two years, or starts to fade in two months.

Standard plating on the market sits at around 0.5 microns. Some is thinner still — thin enough that a single knock can reveal the metal underneath.

Vermeil is not a marketing word

Unlike “luxury” or “premium”, vermeil is defined in law. The US Federal Trade Commission requires three conditions at once:

• A base of 925 sterling silver — not brass, not filled alloy
• Gold of at least 10 karat
• A minimum thickness of 2.5 microns

A piece plated at 0.5 microns cannot legally be called vermeil. It can only be called gold plated. That is why the word matters: it separates the product from the thing that resembles it.

Why 3 microns, and not 2.5

Alison Mariot uses 3 microns of 18K gold — above the legal minimum, and six times standard plating.

That figure was not chosen because it sounds good. It is the point at which the layer becomes thick enough to survive daily contact — the wrist, the pocket, the sleeve — without wearing through to the metal beneath.

In practice: standard plating is measured in months. Vermeil at 3 microns is measured in years.

Why 18 karat, and not 24

24 karat gold is pure, but soft. It scratches easily and wears away faster.

18 karat gold is 75% pure gold, alloyed with metals that give it hardness. The result is a warmer tone and a far more durable finish — the reason jewellery houses work in 18 karat rather than 24.

How to tell when you are buying

When a shop sells gold jewellery, ask three questions:

• How many microns is the plating? If it is nowhere on the page, there is a reason.
• What karat is the gold? “Gold plated” without a number means nothing.
• What is underneath? Brass tarnishes and can provoke allergies. Sterling silver does not.

A shop that avoids all three usually does not have answers it enjoys giving.

How to care for it

Even 3 microns are not indestructible. A few habits extend the life of a piece considerably:

• Put jewellery on last, after perfume and cream
• Take it off before swimming, sauna and training — chlorine and perspiration change any finish
• Keep it in its own box, not mixed with other pieces
• Wipe it with a soft dry cloth after wearing

Why it matters

The difference between 40 euro and 162 euro is not the name on the box. It is how long you keep the piece.

A ring that fades after six months costs 40 euro twice a year. A ring that stays as it was costs 40 euro once.

The entire MERAKI collection is made in 18K gold vermeil at 3 microns, set with 100% natural gemstones. Every piece arrives in a gift box with a two-year warranty.