A resposta curta é yes, cubic zirconia is considered a fake or imitation diamond. However, calling it “fake” can be a bit misleading because it doesn’t imply that the stone is trying to deceive you—it simply means it’s a different material designed to look like a diamond. Let’s break down exactly what that means and why understanding the difference matters.

What Is Cubic Zirconia, Exactly?

Zircônia cúbica (often called CZ) is a man-made gemstone composed of dióxido de zircônio (ZrO₂). It is a “diamond simulant,” a term used by the jewelry industry for any material that visually resembles a diamond but has a very different chemical composition and physical structure, according to the Instituto Gemológico da América (GIA) .

This stone was first mass-produced in the 1970s and has since become the most popular and economically important diamond simulant in the world. It is created in a lab by heating zirconium oxide powder to extreme temperatures (around 5,000°F) until it melts, then cooling it to form crystals. Because it is entirely lab-created, it is not a mineral found in nature and has no intrinsic rarity. Explore nossa coleção premium de zircônias cúbicas soltas. Para ver a qualidade que oferecemos.

The Key Difference: CZ vs. Diamond

The core distinction is that diamonds are made of pure crystallized carbon, formed naturally over billions of years deep within the Earth. Zircônia cúbica is made of zirconium dioxide and is created in a laboratory in a matter of hours or days.

Here are the main differences you can see and feel:

Propriedade	Diamante	Zircônia cúbica
Durabilidade	Perfect 10 on the Mohs scale ; hardest natural material	8 a 8,5 on the Mohs scale; prone to scratching and chipping
Brilho	Brilliant reflection of white light	Higher “"fogo"” —disperses light into colorful rainbow flashes
Preço	Thousands of dollars per carat	A few dollars per carat
Longevidade	Lasts a lifetime	About 2 years with daily wear before looking cloudy

Both are beautiful, but the sparkle is noticeably different to a trained eye. Para marcas e designers de joias, we offer wholesale stones with consistent quality for your collections.

Understanding “Fake” vs. “Simulant”

The jewelry industry uses specific terms to avoid confusion:

Term	Meaning	Example
Simulant or Imitation	Material that looks like another gemstone but has different composition	Cubic zirconia (looks like diamond, made of ZrO₂)
Synthetic or Lab-Grown	Chemically and physically identical to natural gemstone, created in a lab	Lab-grown diamond (made of carbon, same hardness and sparkle)

Cubic zirconia is a simulant, not a synthetic diamond. It looks like a diamond, but it’s made of entirely different materials. The Sociedade Internacional de Gemas (IGS) provides a comprehensive guide to understanding these distinctions.