Cubic zirconia, usually called CZ, is in a huge share of the earrings you'll see for under a couple hundred dollars. It gets called "fake diamond," "AAA quality" and "diamond alternative," sometimes all in one listing.
Here's what it actually is, how it holds up on your ears, and how to read the labels.
The quick answer
CZ is a lab-made stone that looks a lot like a diamond at a small fraction of the price. It's softer than a diamond, so it can scratch and dull over time. For earrings, that's a fair trade for a lot of people, as long as you know what you're buying.
What cubic zirconia actually is
CZ is zirconium dioxide, a crystal made in a lab. It isn't a diamond, which is pure carbon, and it isn't a lab-grown diamond either. It's a diamond simulant, meaning it's made to look like one.
That's not a bad thing. It just means a seller shouldn't imply it's a diamond. A good listing says "cubic zirconia" or "CZ" plainly.
How it looks
CZ is colorless and clear, and in small sizes it's very hard to tell from a diamond at a glance. Up close there are differences. It throws more colored flashes than a diamond, but it doesn't copy a diamond's sparkle pattern exactly.
On the ear, that usually reads as a bright, clean sparkle. If you compare a CZ stud and a diamond stud side by side in person, you'll see it. In a photo or across a table, you mostly won't.
How durable it is
CZ rates about 8 to 8.5 on the Mohs scale. A diamond is a 10. That gap shows up over time: CZ is more prone to scratches and can look cloudy after a lot of wear (Blue Nile).
For earrings this matters less than it would for a ring. Your hands bump into things all day. Your ears mostly don't. It's still worth keeping CZ clean, which is easy:
- Wipe it with a soft cloth after wearing
- Use warm water and a drop of mild soap, with a soft brush for the back of the stone
- Skip rough scrubbing and harsh cleaners
- Store pieces separately so harder stones don't scratch it
What "AAA CZ" actually means
You'll see CZ sold as A, AA, AAA, AAAA or even 5A. It sounds like an official scale. It isn't.
CZ grades aren't standardized. The Gem Society calls the retailer grading system a marketing tactic with no scientific basis. Another jewelry guide says AAA grading varies from jeweler to jeweler, with no strict standards behind it (Fenton). Diamonds have the GIA. CZ has no equivalent.
What to look at instead of a grade
- The cut. A well-cut stone catches light evenly. A badly cut one looks flat or glassy.
- Clarity. Good CZ should look clean, with no visible bubbles or cloudiness.
- The setting. Prongs and bezels should hold the stone snugly, with no gaps or sharp edges.
- The metal. This matters most, and we get to it next.
Why the metal matters more than the stone
The stone sits on top of your ear. The post sits inside your piercing. A great CZ on a cheap plated post can still irritate you, and a simple CZ on implant grade titanium can be comfortable for years.
That's why we start with the metal. Read more in What Is Titanium Jewelry? and Nickel-Free Earrings: What Actually Qualifies.
When CZ makes sense, and when a diamond does
CZ is a good fit if you want a clean sparkle without the price, or you're trying a style before committing to it.
A diamond makes more sense if you want the hardest stone, a piece to keep for decades, or something with resale value.
Neither is wrong. They do different jobs.
CZ at Aurelai
Many of our titanium pieces are set with cubic zirconia in implant grade titanium (ASTM F136), with a flat back design.
Our 14K solid gold pieces are set with natural diamonds or CZ, depending on the style, so check each product page.