We understand our products may not be for everyone, and that’s just fine. We still appreciate the opportunity to educated you with our years of experience and vast knowledge on this particular subject.

Definitions:
Cubic Zirconia (CZ) – a colorless and optically flawless crystalline form of zirconia that is similar to a diamond in refractivity and appearance.

Diamond – a precious stone consisting of a clear and typically colorless crystalline form of pure carbon, the hardest naturally occurring substance.

The differences? As you can see by the definitions each substance contains several similar key terms. We will break them down here. In addition, we will cover the 4 C’s of diamond grading as it applies to both stones.

Color
Cubic Zirconia – usually purchased in the colorless form as a diamond simulant, but available in a variety of colors from aquamarine to Yellow.

Diamond – diamonds come in a variety of colors many of which are not desirable, and considered a defect in the stone. Very expensive diamonds can be purchased in the colorless form or more desired colors.

Color breakdown – Cubic zirconia as well diamonds come in a colorless form, but diamonds range in the thousands per carat for a colorless stone. Cubic zirconia, on the other hand, cost under $50 for a 1ct stone. Diamonds come in a variety of color gradings with colorless “D” being the most desirable. All Cubic zirconia stones are “D” color.

Flawless/Clarity
Cubic Zirconia – always a flawless stone.
Diamond – have a wide variety of flaws with their own grading system called a clarity. Clarity gradings range from flawless to Shattered appearance or vivid disfiguring
and dangerous inclusions and surface marks. Again, pricing depends on these ratings.

Flawless/Clarity breakdown – Cubic Zirconia is a completely flawless stone, where as diamonds are prices according to their clarity rating.

Cut
Cubic Zirconia – Always cut according to flawless stone specifications
Diamonds – Cut to remove naturally occurring flaws.

Cut breakdown – A diamonds fire and brilliance can be lost in the cutting process due to poor cutting, or using non-standard proportions in order to cut out flaws. Where as, cubic zirconia does not have naturally occurring flaws. Cubic zirconia can be cut to perfect proportions every time.

Refractivity/Sparkle
Cubic Zirconia – cut to perfect diamond specifications – Rating = 2.170
Diamond – when cut to perfect diamond specifications – Rating = 2.417

Refractivity/Sparkle breakdown – All cubic zirconia are cut to perfect specifications and will always have the above refractive rating. Diamonds are cut in order to remove naturally occurring flaws (in order to increase their sale value), which means, many diamonds will have a lower refractive rating that the ideal cut rating.
I understand these numbers don’t mean much, and if you thought so you are correct! Refractivity is measured using high-tech equipment, and a difference of .247 cannot be detected by the naked eye.

Carat weight
Cubic Zirconia – Cubic Zirconia is more dense that diamonds, meaning the same size will weigh slightly more. Many times when ordering Cubic Zirconia the sizes/weights given are the diamond equilivant (or the same visual size). All CZ stones can be cut to perfect diamond specifications.
Diamond – Because of the features listed above and naturally occurring flaws, diamonds are measured in weight. A 1 carat stone may vary in width, depth, or size of the angles. Variations in these have negative effects on refractivity.

Carat weight breakdown – Diamonds come in a variety of sizes and shapes depending on how they were cut to remove flaws. Ideal cut diamonds are very desirable and thus very expensive. Cubic zirconia can always be cut to perfect specifications to enhance all the features listed above.