Sapphire (Synthetic Czochralski) | Gemopedia

Synthetic sapphire can be created in many ways, one of which is called the Czochralski method. During this process, the various elements that make up sapphire 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 Fancy Sapphire
Colors
Light Pink, Pink, Reddish Purple, Purple

Sapphire (Synthetic Czochralski) Classification

Common Name

Sapphire (Synthetic Czochralski)

Species

Corundum

Variety

Pulled Synthetic Fancy Sapphire

Colors

Light Pink, Pink, Reddish Purple, Purple

Alternate Names

Lab Created Fancy Sapphire

Gemstone Groups

Key Separations

magnification and RI, birefringence, pleochroism

Comments

Sapphire (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: Variable
LWUV: Variable

CCF Reaction

Pink: weak red

Pleochroism

Dichroic, moderate, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.018

Comments

Sapphire (Synthetic Czochralski) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

Czochralski pulled

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic Czochralski) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

4.1-3.95 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

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1