What is ECZ stone? How is ECZ stone different from diamonds?
Key Takeaways
- ECZ stone is a type of gemstone crafted with brilliant sparkle and high clarity, often used in jewelry design thanks to its attractive appearance and reasonable price. So what exactly is ECZ...
ECZ stone is a type of gemstone crafted with brilliant sparkle and high clarity, often used in jewelry design thanks to its attractive appearance and reasonable price. So what exactly is ECZ stone? What colors and outstanding characteristics does it have? Let's explore the details with Jemmia in the article below!
What is ECZ stone?
ECZ stone stands for Excellent Cubic Zirconia, a high-quality upgraded form of CZ stone (Cubic Zirconia), produced from pure Zirconium Dioxide (ZrO₂).
Compared to regular CZ, ECZ has higher clarity, better hardness, more refined cuts, and sharper light reflection.

With a hardness of 8.5/10 on the Mohs scale, CZ stone is very durable, difficult to scratch, and has excellent optical properties. Therefore, it is very difficult to distinguish a real diamond from a CZ stone with the naked eye.
Although it looks similar to a diamond, ECZ stone has no investment value and can become scratched and cloudy over time.
Colors of ECZ stone
ECZ stone comes in a variety of colors, so it is often used in jewelry making. Some common colors of ECZ stone are:
White: A color similar to natural diamonds, transparent, and the most basic color of ECZ stone.
Yellow: A gentle yellow color, similar to yellow diamonds.
Pink: Light to deep pink, often favored in feminine designs.
Blue: Blue can have many shades from light blue to dark blue.
Green: A bright green color that creates elegance and prominence.
Red: A brilliant red color that brings striking and captivating beauty.
Purple: A gentle purple color that creates a noble and luxurious feeling.
Brown: A warm brown color that creates classic beauty.
Black: An elegant black color, a popular choice in modern and individualistic designs.

Thanks to its ability to vary in color and brightness, ECZ stone can easily suit many different jewelry styles.
Standards for evaluating ECZ stone
Although ECZ stone is a synthetic stone, it still has its own quality evaluation standards. Below are the 4 main standards for evaluating ECZ stone:
Color: Similar to diamonds, the color of ECZ stone is graded on a scale from D to Z, with D being the purest white color. The closer the color of ECZ stone is to D, the higher it is rated and valued. In addition, "fancy color" shades are also highly valued.
Clarity: ECZ stone is synthetic, so the production process can better control impurities. Therefore, most ECZ stones have high clarity. However, the clarity of ECZ stone can also be evaluated according to ratings from F to I. The purer the stones and the fewer impurities they have, the higher their value.
Cut: The cut affects the sparkle and light reflection of ECZ stone. An ECZ stone with a good cut will have brilliant sparkle and optimal light reflection.
Carat weight: Carat weight is the unit of measurement for gemstone weight. The larger the carat weight of ECZ stone, the more valuable it is.
When choosing to buy ECZ stone jewelry, you should pay attention to the above standards to ensure the quality and value of the product.

How to distinguish ECZ stone and diamond
ECZ stone and diamond can be distinguished through several characteristics based on the differences in their physical and chemical properties. Below is a detailed comparison table to distinguish ECZ stone and diamond:
Characteristics | ECZ stone (Excellent Cubic Zirconia) | Diamond |
Chemical composition | Zirconium dioxide (ZrO2) | Carbon (C) |
Origin | Synthetic | Natural, Synthetic |
Hardness (Mohs scale) | 8.5 | 10 |
Sparkle | Very high, but may have a slightly excessive "rainbow" sparkle | Very high, with more natural, brilliant, and refined sparkle |
Transparency | Usually very transparent, with few impurities | May contain natural impurities, graded according to the clarity scale (FL to I3) |
Dispersion | Higher than diamond, creating a more obvious "rainbow" effect | High, creating the characteristic sparkling fire |
Price | Cheaper | More expensive |
Thermal conductivity | Lower than diamond | Better than ECZ. When touched with the tongue, a diamond will feel cool, while ECZ feels slightly warm. |
Specific gravity | Heavier than diamond | Lighter than ECZ |
Color | Can be created in many different colors, including perfect white | Comes in many colors, but pure white (colorless) is very rare and expensive |
Lifespan | Can become scratched and fade over time | Very durable, difficult to scratch and does not become cloudy |
Basic identification methods | Look closely at the sparkle: ECZ may have excessive "rainbow" reflections. Check hardness: ECZ is softer than diamond. Check thermal conductivity: Diamond feels cooler. Price: ECZ is much cheaper. | Gemological certification (GIA). Check hardness and thermal conductivity. Observe the sparkle under light. |
From the analysis above, although ECZ stone has a sparkling appearance and low price, it has no investment value and can become scratched and cloudy over time. In contrast, diamond is a symbol of luxury and class, and is also a smart investment, capable of retaining value and even increasing in price over time.
Therefore, if you want to buy a piece of jewelry that is not only beautiful but also has lasting value, bringing confidence and class, then choose diamond jewelry. Diamond is not only a piece of jewelry, but also a symbol of eternal love, success, and power.
See more: GIA diamond price list at Jemmia Diamond
With sparkling beauty, high durability, and a reasonable price, ECZ stone is an excellent choice for those who want to own luxurious jewelry. Hopefully, the above article from Jemmia has provided you with useful information about ECZ stone and helped you understand what ECZ stone is, its evaluation standards, and how to distinguish it from diamond.