The density of cubic zirconia is about 1.7 times that of a diamond, meaning if you compare a CZ with a lab-grown diamond of the same size, the first will be significantly heavier. Lab-Grown Diamonds vs Cubic Zirconia Sparkle and Price. Another significant difference between cubic zirconia and synthetic diamonds is their refractive indices. A one carat hand-cut hand-polished cubic zirconia gemstone will retail for around $20 dollars, whereas a one carat diamond with passable cut, color and clarity grades will retail for around $1,500 dollars. The differences in price between cubic zirconia and diamonds becomes even more significant with an increase in carat size. Additionally, moissanite scores 9.25 on the Mohs hardness scale, making it more durable than cubic zirconia but slightly less durable than diamonds. In summary, diamonds, cubic zirconia, and moissanite are three popular gemstones with unique properties and characteristics. Diamonds are highly prized for their durability, brilliance, and rarity Moissanite contains more silicon than cubic zirconia, which gives it a greenish tint. Cubic zirconia, on the other hand, is made of zirconium oxide, which is colorless. In terms of clarity, cubic zirconia is usually flawless, whereas moissanite can often have visible inclusions. So, if you’re looking for a stone that looks like a diamond but Whereas, the cubic zirconia is 5.5-5.9 denser than the diamonds. Compared to the diamonds, cubic zirconia will be adding slightly noticeable weight. For example, if you are purchasing 1 carat or larger cubic zirconia gemstones compare to diamonds. Then still it will be a small amount than larger carat gemstone rings. Cubic Zirconia Engagement Rings – the Pros and Cons. Not everyone will love the idea of a cubic zirconia engagement ring, but there are pros to this choice. Affordability – Needless to say, the price tag of a CZ engagement ring can be less than 10% of a similar looking diamond ring. Flawlessness – A CZ stone is almost always perfect, with In looking around, the price difference between actual diamonds and the 'knock-offs' listed above is insane! I know that CZ can sometimes become cloudy after maybe a year's worth of wearing it, but for $30-50 for 1 carat of it, and to the human eye it still looks beautiful and is, according to wikipedia, "hard, optically flawless and usually Zircon is sometimes confused with Cubic Zirconia. Cubic Zirconia, a synthetic, inexpensive Diamond simulant, resembles colorless Zircon and has a similar sounding name. However, the two are entirely separate substances, and have no connection with each other except for the fact that they both contain the element zirconium in their chemical H3emti.