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Nexus Diamond vs. CZ


Our Nexus Diamonds and Pure Carbon Created Diamonds are different from a CZ in four key ways: weight, hardness, coating, and chemical composition. These differences result in a superior Nexus Diamond with qualities much closer to that of a mined diamond and Diamond Nexus Pure Carbon Created Diamonds which are the exact same as mined diamonds.



Our Nexus Diamond weighs 15% to 20% more than a CZ of the same size, and a CZ will weight relatively 1.7 times more than that of a diamond of the same size.



Our Nexus Diamond is very hard. The chemical composition of CZ makes it a softer, more porous stone. For example: over time, as you wear a CZ, it will absorb the oils in your skin, the soap you use to wash your hands, etc... Eventually, the CZ will appear yellowish and lose its fire and ability to disperse light. Due to the softness of the stone, its facets will also wear down with use. The hardest a CZ stone will ever be is an 8.5 on the Mohs’ hardness scale. A Nexus Diamond is closer to the properties of a mined diamond. As such, it will not chip, fade, or lose its brilliance over time. The average hardness of a Nexus Diamond is a 9.1-9.2 on the Mohs’ hardness scale, much closer to that of our lab diamonds (and mined) that are a perfect 10.



A lot of companies sell a common CZ and put a coating on their product as a way to differentiate it. Sometimes the language used is "diamond infused", "diamond hybrid" or "sealed in a diamond". The coating they are referring to is called "DLC", which means "diamond-like coating". This coating process has been around for years, and the "diamond" coating being referred to is "amorphous carbon" which is really pencil lead. When a stone is coated with amorphous carbon, the coating must be exceedingly thin as to be essentially non-existent. Otherwise, the stone would be discolored.

At Diamond Nexus, we also have a coating on our Nexus Diamonds. Our coating material is Corundum and other proprietary materials which is substantial, visible under microscopy, and has important measurable physical characteristics. The coating seals the Nexus Diamond's surface, greatly lowers porosity, and makes the stone impervious to outside contaminants. It also increases the hardness and the ability of the simulant to resist scratches. Here you can see an example of our coating which depicts its thickness at 131.2nm, over 10,000 times thicker than our competitors. Because Pure Carbon Created Diamonds we produce are pure carbon, no coating in necessary to maintain their beauty.


Chemical Composition

CZ or cubic zirconia is made of zirconium oxide and sometimes a yttrium stabilizer. Nexus Diamonds are comprosed of (in order of atomic weight):

Carbon (C)
Sulfur (S)
Iron (Fe)
Calcium (Ca)
Cobalt (Co)
Nickel (Ni)
Yttrium (Y)
Zirconium (Zr)
Gadolinium (Gd)
Hafnium (Hf)

Our Pure Carbon Created Diamonds, on the other hand, are chemically made up of solely Carbon (C), just like a mined Diamond.

Diamond Nexus vs. Moissanite

Below you will see two charts from an independent lab report which shows a spectrographic analysis for CZ and for our Nexus Diamonds (not to be confused with our Pure Carbon Created Diamonds). A spectrographic analysis is an analysis which uses a spectroscope (an optical device for producing and observing a spectrum of light or radiation from any source) to determine the chemical elements in a source by measurement of the wavelength and spectral line intensity produced by any one of several methods of excitation such as arc, flame, infrared and X-ray. As you can see from the data, our Nexus Diamonds are not Cubic Zirconia. We have gone to great lengths to create a Nexus Diamond that is nearly the same physically and optically to a mined diamond. The difference is in the chemistry-and that exact formula is proprietary.



Spectographic Analysis



How is our Nexus Diamond different from Moissanite?

Our Nexus Diamond is different from Moissanite in much the same way that a diamond is different from Moissanite. While Moissanite is beautiful in its own right, it does not function chemically or optically like a diamond or a Nexus Diamond. Chemically, it is silcon carbide. Unlike a diamond or our Nexus Diamond, moissanite is strongly birefringent or doubly refractive. This is a desirable quality in some optical applications, but is not desirable in gemstones. For this reason, Moissanite jewels are cut along the optic axis of the crystal to minimize birefringent effects. Moissanite's higher index of refraction (brilliance) and much greater dispersion (fire) than either a diamond or Nexus Diamond make it easy with the naked eye to distinguish a Moissanite from our stone and from a diamond. Finally, where the best quality diamonds and Nexus Diamonds have a D color (meaning virtually colorless), a moissanite stone has a slight green tint to it that becomes more noticeable with increasing carat sizes.


Property Diamond (Mined and Lab) Diamond Nexus Moissanite
Brilliance 7.40 7.40 8.90
Dispersion 0.44 0.46 1.01
Refraction 2.40 2.20 2.68
Refraction Type Isometric Isometric Hexagonal
Crystal System Single Single Double
Birefringence No No Yes
Luster Adamantine Adamantine Viteous
Fracture Conchoidal Conchoidal Conchoidal
Color Streak Colorless Colorless Grey/Green