Cubic Zirconia (Synthetic) | Gemopedia

Cubic Zirconia (abbreviated CZ) is the best-known man-made diamond simulant. A simulant is any material, natural or created by man, which imitates the appearance of a natural gem whereas a synthetic gem is man-made but must have a natural counterpart that duplicates the chemical, optical, and physical properties of the natural gem. While it's often touted as the most popular diamond simulant, cubic zirconia is also a synthetic gem. Natural crystals of cubic zirconia have only been found as inclusions in zircon.
Alternate
Names
CZ, Cubic Z, Diamond-Z, Diamonair II, Diamononesque, Diamonite, Djevalite, Phianite, C-Ox, Pearl CZ
Colors
Colorless, Pink, Grayish Blue To Dark Blue, Pale To Strong Yellow, Orangy Yellow, Orange, Orange Red, Red, Yellowish Green, Bluish Green, Green, Purple, Brown, Black

Cubic Zirconia (Synthetic) Classification

Common Name

Cubic Zirconia (Synthetic)

Species

NA

Variety

Colors

Colorless, Pink, Grayish Blue To Dark Blue, Pale To Strong Yellow, Orangy Yellow, Orange, Orange Red, Red, Yellowish Green, Bluish Green, Green, Purple, Brown, Black

Alternate Names

CZ, Cubic Z, Diamond-Z, Diamonair II, Diamononesque, Diamonite, Djevalite, Phianite, C-Ox, Pearl CZ

Gemstone Groups

Key Separations

Negative reaction to diamond tester, OTL RI, strong fire, lack of doubling, SG, fracture and pavilion flash. Orange pavilion flash when view through magnification if well cut stone. Slight see-through effect.

Comments

Misnomer: synthetic diamond. Heft higher than a diamond. Translucent pink SG: 6.14 to 6.16Translucent white or pearl CZ SG: 6.11 to 6.12

Cubic Zirconia (Synthetic) Optical Properties

Transparency

Transparent - Opaque

Refractive Index

Over The Limit 2.15-2.182
Tolerance:0.03

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: varies with colorcolorless: yellow or greenish yellowtranslucent pink: weak to moderate, chalky light yellow-green translucent white: very light pink
LWUV: varies with colorcolorless: greenish yellow or yellow-orangetranslucent pink: strong yellow-greentranslucent white: inert

CCF Reaction

Translucent white: yellowish green; Translucent black: dark red

Pleochroism

None

Dispersion

Strength: strong fire Value: 0.06

Comments

Cubic Zirconia (Synthetic) Chemistry & Crystallography

Chemical Name

zirconium oxide

Chemical Formula

ZrO2

Synthesis

skull melt

Crystal System

Cubic

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Cubic Zirconia (Synthetic) Characteristic Physical Properties

Hardness

8.5

Streak

Specific Gravity

5.6-6 Typical:5.8

Toughness

Good

Inclusions

Cubic zirconia is type I clarity stone. Stones are often free of inclusions but might have gas bubbles or zirconium oxide remnants. Translucent stones are uniform in color in reflected light and banded or striped in strong transmitted light.

Luster

SubAdamantine

Stability

Fracture

Conchoidal

Cleavage

None

Comments

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