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  • A beautiful, affordable diamond alternative
  • The color, clarity and brilliance of the finest ‘collector quality’ diamonds
  • The only diamond simulant with actual nano-diamond crystals
  • Risk free lifetime guarantee against chipping, scratching and brilliance
  • Trade up to moissanite, clarity enhanced diamond or natural diamond

Radiance™ Diamond Simulant

Now you can have the look of collector quality diamonds at a fraction of the price. Guaranteed.

The Radiance™ diamond simulant is both exceptionally beautiful, amazingly durable and surprisingly affordable.

Radiance™ is the only diamond simulant created using a patent pending form of “Polycrystalline Diamond” which is man-made and “composed of millions of small diamond crystals aligned together”. These actual nano-diamond crystals are applied to a seed crystal composed of crystallographically isomeric zirconium, and doped with yttrium. Then using high pressure, carbon, and time, polycrystalline diamond is formed on the seed crystal surface. This high pressure diamond treatment (HPDT) process gives Radiance™ a beauty that exceeds even natural diamond gemstone, and an amazingly durable outer layer that is both simulant and durable man-made diamond crystal 4000 times more durable than cubic zirconia.

Illustration showing the layering of nano particles on the Radiance™ diamond simulant

Radiance™ diamond simulants have the look of the finest 'collector quality' natural diamonds but at a fraction of the cost. Each Radiance™ diamond is precisely cut to ideal specifications for maximum brilliance, has flawless clarity and is virtually colorless. The result is the most brilliant, bright, crystal clear diamond alternative available.


Radiance™ diamond simulants are colorless, in the D-E-F color range




Radiance™ diamond simulants are virtually flawless




All Radiance™ diamond simulants are ideally cut to exact diamond industry proportions for maximize brilliance



A lifetime of beauty, guaranteed!

All Radiance™ diamond simulants come with a limited lifetime guarantee against scratching, scuffing, chipping, brilliance and even loss. Should anything happen to your Radiance™ diamond, simply return it to Joseph Schubach Jewelers to have it replaced for a nominal resetting fee.

Unparalleled Trade-Up Program

You can have the diamond of your dreams! With Joseph Schubach Jewelers trade up program you can buy a Radiance™ diamond now and trade up to a larger Radiance™ diamond, moissanite, clarity enhanced diamond or a natural diamond at any time and receive full credit towards your purchase. See our Unparalleled Trade-Up policy for more details.

Modern nano-technology makes Radiance™ diamond simulants beautiful, brilliant and affordable

The most common diamond simulant is cubic zirconia – which dates back to its discovery in 1937, when two German mineralogists discovered the cubic form of zirconium oxide. Soviet scientists learned how to “grow” this mineral in a laboratory in the 1970s, and cubic zirconia became the most widely sold diamond simulant (imitation diamond) in jewelry. Premium grade rough combined with fine cutting provides a fine looking imitation to a diamond but there are noticeable differences namely the slightly lower brilliance than a diamond as well as the "white table flash", "glassy look" and "dead spots when viewed from an angle".

Do not confuse a Radiance™ diamond simulant with plain cubic zirconia sold under various names such as Diamond Nexus Labs, Brilliante, Russian Brilliants, Diamonique, Van Graff, or Zirconite.

Radiance™ is the only diamond simulant with an optical polycrystalline layer of carbon that has a combined refractive index higher than diamond. True lab created polycrystalline diamond (pure carbon diamond bonds rather than DLC, or amorphous, or diamond like coatings) providing superior durability and wear – with a lifetime replacement guarantee.

The result is a dazzling diamond simulant that shows more sparkle, brilliance, and fire than even the finest natural diamonds. (see the Radiance's Gemprint™ results from independent GCAL testing laboratory below for a comparison against natural diamond).

Because Radiance™ contains actual diamond carbon bonds in an optical layer that enhances the refractive index, the result is a diamond simulant that matches the light play, radiance and sparkle of the most rare gem quality diamond but at significantly lower diamond simulant pricing.

Get the look of the finest collector quality diamonds at a fraction of the cost.

It is virtually impossible to visually distinguish Radiance™ from an internally flawless super-fine natural diamond. The amazing look of Radiance™ is attributed to the crystalline diamond treatments that render it with optical properties of the finest natural diamond. The only way to positively identify Radiance™ is by its weight, hardness and chemical component using grading laboratory equipment. Radiance™ is precisely cut to ideal proportions with ideal symmetry, ideal proportions, and ideal polish, as well as thin polished girdles. Until now the only popular diamond alternatives have been Cubic Zirconia, DLC (diamond like carbon, or amorphous) coated Cubic Zirconia and Moissanite.

Just as cultured pearls offer you the beauty of pearls at a fraction of the natural pearl price, Radiance™ is able to offer you the radiance and stunning beauty of real diamonds, but at a fraction of the natural diamond price.

As with any gemstone, laboratory-created diamond simulants such as Radiance™ are evaluated on the basis of the four Cs: carat, cut, clarity and color. The hardness level of a man-made Radiance™ is 8.5, which is harder than many gemstones. Caring for these radiant stones is easy; just clean it as you would clean a regular diamond! You will find a beautiful selection of Radiance™ diamond simulants for sale on our website - at incredibly affordable prices! Whether you are seeking the classic round shape to create ring or necklace settings, or are searching for a unique shape such as a heart, oval, octagon, square, marquise, pear or star, we can meet your needs.

Technical Data

Nanocrystalline Diamond Coatings

Radiance™ diamond's Nanocrystalline Diamond Coating process is the subject of a pending patent in the area of treatment of utility and/or decorative objects with thin film nanocrystalline diamond for the purpose of improving optical and physical properties of materials. Radiance™ is created by employing a multistep treatment process which involves the development of a coating of nanocrystalline diamond particles of size below 30 nm uniformly on all cut surfaces of the gem material utilizing Radiance's proprietary nanodiamond technology. Unlike diamond like carbon (DLC, or amorphous) each nanodiamond particle is pure sp3 diamond with all its optical and physical properties.

The gallery images demonstrate the existence of the nanocrystalline diamond particles on Radiance™ diamond simulants in a series of high-resolution micrographs obtained via scanning electron microscopy (SEM) of the facets as well as high resolution transmission electron microscopy (HR-TEM) and spectral analysis of the coating using energy dispersive spectroscopy (STEM/EDS) . The average size of the nanocrystalline diamond cluster varies between 5 – 30 nm and as can be seen from the micrograph captured at magnification over 100,000X, the treated gem is uniformly covered with a high density of the diamond crystallites that become clearly visible only under tremendous magnification (low magnification SEM image at 2000X shows the presence of the diamond crystallites as a barely discernible blanket of dots on the coated facet).

Testing was performed by the independant laboratory EVANS ANALYTICAL GROUP which is the world's premier materials characterization and surface analysis laboratory with state of the art instruments for providing analysis of materials structures at the nano scale. For more information on the analytical techniques used for analysis of Radiance™ Diamond's nanocrytsalline diamond coating visit http://www.eaglabs.com/