Synthetic Star Ruby | Gemopedia

Synthetic star ruby exhibits the optical phenomenon called asterism, a star-like pattern created on the surface of a gemstone when light encounters parallel fibrous, or needle-like, inclusions within its crystal structure. Light that strikes the inclusions within the gem reflects off of the inclusions, creating a narrow band of light. When two or more intersecting bands appear, a star pattern is formed. Depending on the crystal, the star may have four, six, or even twelve rays. When only one band forms, it is classified as a cat's eye, As a synthetic gemstone, this jewel exhibits the same chemical, optical and physical properties as natural star ruby.
Alternate
Names
Lab Created Star Ruby
Colors
Orangy Red To Purplish Red

Synthetic Star Ruby Classification

Common Name

Synthetic Star Ruby

Species

Synthetic Corundum

Variety

Flame-Fusion Synthetic Star Ruby

Colors

orangy red to purplish red

Alternate Names

lab created star ruby

Gemstone Groups

Key Separations

magnification, appearence and RI

Comments

Stones typically have flat bases and are well cut calibrated cabochons. Stones will have brighter colors than natural rubies.

Synthetic Star Ruby Optical Properties

Transparency

Semitransparent To Opaque

Refractive Index

1.762-1.77 Tolerance: (+0.009/-0.005)

Birefringence

0.008-0.01

Optic Character

uniaxial

Optic Sign

negative

Polariscope Reaction

doubly refractive (DR) or AGG depending on transparency

Fluorescence

SWUV: stronger than natural, moderate to strong orangy red
LWUV: stronger than natural, might be strong orangy red

CCF Reaction

Pleochroism

Value: usually none to weak, depending on transparency

Dispersion

Strength: weak fire Value: 0.018

Comments

Synthetic Star Ruby Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

flame fusion

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Synthetic Star Ruby Characteristic Physical Properties

Hardness

9

Streak

white

Specific Gravity

4.1-3.95

Toughness

Excellent

Inclusions

Flame fusion stones might display curved growth and a unusually display a centered and well defined 6-rayed star. The curved growth is especially visible on the flat base of the stone. The stones might have gas bubbles and minute rutile needles that make up the star will confined to the surface of the stones.

Luster

Subadamantine To Vitreous

Stability

Very Good

Fracture

Conchoidal

Cleavage

None, May Show Parting On Twinned Stones

Comments

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