Cubic Zirconia vs. Diamond Jewelry: What's the Difference?

When shopping for jewelry, you've likely come across both cubic zirconia (CZ) and diamond pieces. While they can look similar at first glance, these two gemstones have very different properties, prices, and care requirements. Understanding the differences will help you choose the right piece for your needs, whether you're looking for an engagement ring, everyday earrings, or a meaningful gift.

In this guide, we'll break down the key differences between cubic zirconia and diamonds, covering everything from hardness and brilliance to cost and maintenance. We'll also share tips on how to style CZ jewelry for an affordable diamond look.

What Is Cubic Zirconia?

Cubic zirconia is a synthetic gemstone made from zirconium dioxide. It was first created in the 1970s as a diamond simulant and has since become one of the most popular diamond alternatives. CZ is optically flawless, meaning it has no inclusions or blemishes, which gives it a very clean, brilliant appearance. It's also much more affordable than diamonds, making it accessible for those who want the look of a diamond without the high price tag.

One of the biggest advantages of CZ is its versatility. It can be cut into various shapes and sizes, and because it's man-made, it's available in a wide range of colors, including classic clear, pink, blue, and more. At Bryan Anthonys, you'll find CZ used in pieces like the Always In My Heart Icon Stud Earrings, which feature sparkling cubic zirconia hearts that add a touch of brilliance to any outfit.

• Cubic zirconia is a synthetic stone, so it's more affordable and readily available than diamonds.

What Is a Diamond?

Diamonds are natural gemstones formed deep within the Earth's crust over billions of years. They are composed of carbon atoms arranged in a crystal lattice, which gives them exceptional hardness—a 10 on the Mohs scale. This makes diamonds incredibly durable and resistant to scratching, making them ideal for everyday wear, especially in rings and bracelets.

Diamonds are valued based on the 4 Cs: cut, color, clarity, and carat weight. Natural diamonds can have inclusions (internal flaws) and variations in color, which can affect their brilliance and price. While diamonds are more expensive than cubic zirconia, they also hold their value better over time. For those who prefer natural stones, pieces like the Birthstone Pendant Necklace — Ruby offer a different kind of natural beauty, but for a classic diamond look, CZ is a popular alternative.

• Diamonds are the hardest natural material, making them very durable for daily wear.

Key Differences at a Glance

Hardness: Diamonds rank 10 on the Mohs scale, while cubic zirconia ranks about 8.5. This means diamonds are more scratch-resistant and will maintain their polish longer. CZ can become dull over time if not cared for properly.

Brilliance and Fire: Both stones have high refractive indices, but CZ actually has slightly more dispersion (fire) than diamonds, meaning it can show more rainbow colors. However, diamonds have a unique sparkle that many people prefer. CZ may appear too perfect or glassy to a trained eye.

Cost: Cubic zirconia is a fraction of the cost of diamonds. A high-quality CZ stone might cost $20–$50, while a comparable diamond could cost thousands. This makes CZ an excellent choice for fashion jewelry or for those on a budget.

Weight: CZ is denser than diamond, so a CZ stone will weigh about 1.7 times more than a diamond of the same size. This can affect the feel of the jewelry, especially in earrings or rings.

• If you want durability and long-term value, go with diamonds. If you want a brilliant look at a low price, choose CZ.

How to Spot the Difference Between CZ and Diamond

If you're trying to tell whether a stone is cubic zirconia or diamond, there are a few simple tests you can do at home. First, check the edges: diamonds have sharp facets, while CZ facets tend to be slightly rounded. You can also try the fog test: breathe on the stone—diamonds disperse heat quickly and won't stay foggy for long, while CZ will stay fogged up longer.

Another method is to look through the stone at a piece of newspaper. If you can read the text through the stone, it's likely CZ (because of its higher dispersion), while a diamond will scatter the light and make the text blurry. However, the most reliable way is to use a jeweler's loupe to look for inclusions—diamonds often have natural inclusions, while CZ is typically flawless.

• Use a loupe to check for inclusions: diamonds have them, CZ usually doesn't.

Which Should You Choose?

The choice between cubic zirconia and diamond ultimately depends on your priorities. If you're looking for an heirloom piece or an engagement ring that will last a lifetime, a diamond is a classic investment. But if you want a beautiful, affordable piece for everyday wear or a trendy style, CZ jewelry is a fantastic option. You can get the same sparkle without worrying about loss or damage.

Many people mix both in their jewelry collection. For example, you might wear a diamond solitaire for special occasions and CZ studs like the Bloom Stud Earrings for daily shine. CZ is also great for travel or for pieces you want to wear without constant care. At Bryan Anthonys, our CZ pieces are designed to give you that diamond look without the diamond price, so you can enjoy stylish jewelry for any occasion.

• Consider your lifestyle: if you're hard on your jewelry, diamonds are more durable; if you like variety, CZ lets you experiment without a big investment.

Caring for Your Cubic Zirconia and Diamond Jewelry

Both types of jewelry require regular cleaning to maintain their sparkle. For diamonds, a gentle scrub with a soft toothbrush and mild soapy water works well. You can also use a commercial jewelry cleaner. For CZ, avoid harsh chemicals and ultrasonic cleaners, as they can damage the stone's surface. Instead, wipe with a damp cloth and mild soap.

Store your jewelry separately to prevent scratches. Diamonds can scratch other stones and metals, so keep them in a soft pouch or a compartmentalized box. CZ is softer than diamond, so it's especially important to avoid contact with harder stones. With proper care, both can last for years and continue to look beautiful.

• Clean CZ with a soft cloth and mild soap—never use abrasive cleaners or ultrasonic machines.

Whether you choose cubic zirconia or diamond, both have their place in a well-rounded jewelry collection. CZ offers an affordable diamond look that's perfect for fashion-forward pieces, while diamonds provide timeless durability and value. At Bryan Anthonys, we carry a range of CZ and gemstone jewelry so you can find the perfect piece for your style and budget.