CZ Rings

CZ Rings by Setting Style & Gold Colour

Rings set with cubic zirconia in 14K gold, across solitaire, halo, three-stone, engagement-style and band designs in yellow and white gold. Cubic zirconia is a man-made stone rather than a gemstone, and this page says so plainly - it is chosen for its brightness, its consistency and what it makes possible at a given price. Each listing gives the design, the stone sizes and the gold colour.

What Cubic Zirconia Is, and How It Behaves

Cubic zirconia is chosen for brightness, consistency and scale. This guide covers what it is made of, how it differs from diamond and moissanite, how it ages, and how to look after it.

What the material actually is

Cubic zirconia is zirconium dioxide stabilised into a cubic crystal structure, produced by melting the oxide with a stabiliser at extremely high temperature and letting crystals form as it cools. The natural mineral equivalent is vanishingly rare, so essentially all cubic zirconia is manufactured. Commercial production began in the 1970s and it rapidly became the most widely used diamond alternative in the world, which it remains.

Cubic zirconia, diamond and lab-grown diamond are three different things

This is the distinction most often muddled, and it matters. A natural diamond is carbon formed in the earth. A laboratory-grown diamond is the same carbon crystal grown in a chamber - genuinely diamond, graded on the same scales. Cubic zirconia is neither: it is a different material chosen because it resembles diamond. A simulant, in the trade term. Anyone comparing prices between the three is comparing three genuinely different things, not three grades of one.

How it looks different, and where

Cubic zirconia has higher dispersion than diamond - it splits light into spectral colours more strongly - so it throws more coloured fire, which reads as a slightly more 'rainbow' sparkle in bright light. It is also less refractive overall and returns light a little differently. In ordinary indoor lighting the two are hard to tell apart at a glance; in strong sunlight the difference becomes more apparent. CZ is also noticeably denser, so a stone of the same dimensions weighs more.

How cubic zirconia ages

This is the honest limitation and the reason to explain the material rather than gloss it. At 8 to 8.5 on the Mohs scale CZ is hard, but it is softer than diamond and softer than sapphire, so over years of wear its facet edges abrade and the surface can pick up fine scratches. The result is a gradual loss of brightness and, in some stones, a slightly cloudy look. It is not a fault; it is what the material does. A CZ can be replaced inexpensively when that happens, which is part of the appeal.

What keeps a CZ bright

Most cloudiness in cubic zirconia is not wear at all - it is a film of soap, lotion and skin oil on the surface, and it comes straight off. Warm water, a little mild soap and a soft brush behind and underneath the stone restores it completely. Doing that regularly makes far more difference to how a CZ ring looks than anything else, and it is the single most useful piece of advice about the material.

Where CZ makes sense

It suits someone who wants a large bright stone in real gold and would rather put the budget into the metal and the scale than into the stone. It suits a ring for occasions, a piece worn in circumstances where losing a diamond would be painful, and a design the wearer expects to enjoy for some years rather than to keep for a lifetime. It does not suit someone who wants a stone that will look the same in twenty years, and the difference should be understood before buying rather than after.

About Cubic Zirconia

What is cubic zirconia?

Zirconium dioxide in a stabilised cubic crystal form - a manufactured material rather than a gemstone, produced by melting the oxide with a stabiliser at very high temperature.

The natural mineral is vanishingly rare, so essentially all cubic zirconia is made rather than mined.

Commercial production began in the 1970s, and it has been the most widely used diamond alternative in the world ever since.

Is cubic zirconia the same as a lab-grown diamond?

No, and this is the most important distinction on this page. A laboratory-grown diamond is genuinely diamond - the same carbon crystal as a mined stone, graded on the same scales.

Cubic zirconia is a completely different material, chosen because it resembles diamond. The trade term for that is a simulant.

They are confused constantly. Anyone comparing prices between CZ, lab-grown diamond and mined diamond is comparing three different things rather than three grades of one.

Can people tell CZ from a diamond?

At a glance in ordinary indoor lighting, usually not. In strong sunlight the difference becomes more apparent, because cubic zirconia throws more coloured fire.

A jeweller can tell immediately - CZ is noticeably denser, so a stone of the same dimensions weighs more, and its optical behaviour is different.

For most everyday purposes it reads as a bright colourless stone, which is what it is.

How hard is cubic zirconia?

Roughly 8 to 8.5 on the Mohs scale. That is hard - harder than quartz, amethyst or peridot - but well below diamond at 10 and below sapphire and ruby at 9.

It is hard enough for a ring worn regularly, though like any stone it can be scratched by harder materials.

What it does do over years is abrade at the facet edges, which is what eventually reduces its brightness.

Does cubic zirconia get cloudy over time?

Most apparent cloudiness is a film of soap, lotion and skin oil on the surface, and it comes off completely with warm soapy water and a soft brush.

There is a genuine long-term effect as well: because CZ is softer than diamond, facet edges abrade with years of wear and the surface picks up fine scratches, which gradually reduces brightness.

That is what the material does rather than a fault. A CZ can be replaced inexpensively when it happens, which is part of the appeal.

Why choose a CZ ring?

Because it puts a large, bright stone into solid gold at a price that a comparable diamond could not reach - the money goes into the metal and the scale.

It suits occasion wear, and situations where losing a diamond would be genuinely painful.

It is a sensible choice for a piece you expect to enjoy for some years rather than to keep for a lifetime, and it should be bought with that in mind.

Is a CZ ring suitable as an engagement ring?

Some people choose one deliberately - as a placeholder, as a travel ring, or simply because they would rather spend elsewhere - and there is nothing wrong with that.

The honest caveat is that an engagement ring is worn constantly for decades, and cubic zirconia will lose brightness over that timescale in a way diamond will not.

If it is the right choice for your circumstances, it is worth knowing the stone can be replaced later without replacing the ring.

How is CZ different from moissanite?

They are different materials. Moissanite is silicon carbide, harder than cubic zirconia at around 9.25 on the Mohs scale, and it holds its brightness far longer.

Moissanite has even higher dispersion than CZ, so it throws still more coloured fire, which some people love and others find obvious.

Both are diamond alternatives rather than diamonds, and moissanite typically costs considerably more than cubic zirconia.

Can a cubic zirconia be replaced if it dulls?

Yes, and that is one of the practical advantages of the material. A jeweller can replace a CZ in an existing setting relatively inexpensively.

It means a gold ring you like can be refreshed rather than retired, since the gold is the lasting part of the piece.

It is worth asking a jeweller before assuming, since it depends on how the stone is set.

How should I clean a CZ ring?

Warm water, a little mild soap and a soft brush, working behind and underneath the stone where the film that dulls it actually collects.

This matters more with CZ than with most stones, because the great majority of apparent cloudiness is surface residue rather than wear.

Avoid ultrasonic and steam cleaning as a general precaution, and take the ring off before swimming and household cleaning.