Is 9ct gold or anodised zirconium harder wearing?

Anodised zirconium, at Mohs 8.5 against 3.5. Airborne dust contains quartz at Mohs 7, so anything below that scratches from ordinary wear alone.

9ct gold, at 11.2 g/cm³ against 6.5. That is 1.7 times the weight, which is very obvious on the hand rather than a technicality.

No. 9ct gold can be resized by any jeweller. Anodised zirconium cannot, so we replace it free for life instead.

9ct gold, starting at £395 against £195. That is about 103% more before any stone or inlay.

Only 9ct gold. Anodised zirconium is not a precious metal, so no hallmark exists for it.

Comparison

9ct gold or Anodised zirconium?

Anodised zirconium is meaningfully harder, so if your hands take a beating the choice is largely made for you.

	9ct gold	Anodised zirconium
Surface hardness	Mohs 3.5	Mohs 8.5
Density	11.2 g/cm³	6.5 g/cm³
Resizable	Yes	Replaced free
Hallmarked	Yes	Not applicable
Hypoallergenic	Alloy dependent	Yes
Price from	£395	£195

What the difference actually feels like

9ct gold is 1.7 times the weight of anodised zirconium for the same ring. On paper that is a number; on the hand it is the difference between a ring you forget about and one you are aware of every time you move. Neither is better. It is worth knowing which you want before you spend anything.

Anodised zirconium sits at Mohs 8.5 against 3.5. Ordinary household dust carries quartz at Mohs 7, which is the line that matters: below it a ring collects fine scratches from nothing more than daily life. That is not a marginal difference between these two, it is the main one.

9ct gold can be resized and anodised zirconium cannot. Fingers change over decades, so this matters more than it seems at the point of buying. Our answer either way is that we cover it: a resize on one, a free replacement on the other, for as long as you own the ring.

The straight answer

Choose 9ct gold if a traditional ring on a real budget, or if anyone who wants it resizable for life.

Choose anodised zirconium if anyone who wants colour that will not wear off, or if hands that react to nickel.

Still torn? The metal chooser asks six questions and picks one, and it will tell you if neither of these is right.

In both materials

Rings to look at

Plain

Court, 9ct

Rounded inside and out. The most comfortable profile there is.

From £395 2 / 3 / 4 / 5 / 6 mm

Plain

Promise band

Slim, hallmarked, with one small stone. Not everything has to be a statement.

From £265 2 / 3 mm

Multi toned

Anodised channel

A band of real colour, set between natural metal edges.

From £315 4 / 5 / 6 / 7 / 8 mm

Common questions

Is 9ct gold or anodised zirconium harder wearing?: Anodised zirconium, at Mohs 8.5 against 3.5. Airborne dust contains quartz at Mohs 7, so anything below that scratches from ordinary wear alone.
Which is heavier?: 9ct gold, at 11.2 g/cm³ against 6.5. That is 1.7 times the weight, which is very obvious on the hand rather than a technicality.
Can both be resized?: No. 9ct gold can be resized by any jeweller. Anodised zirconium cannot, so we replace it free for life instead.
Which costs more?: 9ct gold, starting at £395 against £195. That is about 103% more before any stone or inlay.
Are both hallmarked?: Only 9ct gold. Anodised zirconium is not a precious metal, so no hallmark exists for it.