Ruby (Synthetic - Czochralski) | Gemopedia

Synthetic ruby can be created in many ways, one of which is called the Czochralski method. During this process, the various elements that make up ruby are melted in a platinum crucible. A small gem crystal (called a seed) attached to a rod is then dipped into the melt and slowly pulled away as the crystal grows around the seed. For this reason, the Czochralski method is also known as crystal pulling. Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.
Alternate
Names
Lab Created Ruby
Colors
Orangy Red, Strong Red, Purplish Red

Ruby (Synthetic - Czochralski) Classification

Common Name

Ruby (Synthetic - Czochralski)

Species

Corundum

Variety

Pulled Synthetic Ruby

Colors

Orangy Red, Strong Red, Purplish Red

Alternate Names

Lab Created Ruby

Gemstone Groups

Key Separations

magnification and RI, birefringence, pleochroism

Comments

Ruby (Synthetic - Czochralski) Optical Properties

Transparency

Transparent - 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)

Fluorescence

SWUV: strong red
LWUV: moderate to strong red

CCF Reaction

red

Pleochroism

Dichroic, moderate to strong orangy red and purplish red

Dispersion

Strength: moderate fire Value: 0.018

Comments

Ruby (Synthetic - Czochralski) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

Czochralski pulled

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Ruby (Synthetic - Czochralski) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

3.95-4.1 Typical:4

Toughness

Excellent

Inclusions

Stones are almost always inclusion free. If internal characteristics are present they are gas bubbles, curved striae that is hard to see and smoke-like swirling veil-like inclusions.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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