Sapphire (Synthetic Floating Zone) | Gemopedia

One method of creating synthetic sapphire is called floating zone. In this method of gem synthesis, originally developed by engineers to create super pure silicon, a sintered rod of powdered material, comprised of elements necessary for the gem to grow, is heated with infrared radiation in a vacuum while the ends of the rod are rotated in opposite directions. Since all impurities including air are removed during crystallization, very clean crystals can form.
Alternate
Names
Lab Created Synthetic Fancy Sapphire
Colors
Light Pink, Pink, Reddish Purple, Purple

Sapphire (Synthetic Floating Zone) Classification

Common Name

Sapphire (Synthetic Floating Zone)

Species

Corundum

Variety

Floating-Zone Synthetic Fancy Sapphire

Colors

Light Pink, Pink, Reddish Purple, Purple

Alternate Names

Lab Created Synthetic Fancy Sapphire

Gemstone Groups

Key Separations

Magnification and RI, birefringence, pleochroism

Comments

Sapphire (Synthetic Floating Zone) 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: moderate to strong red
LWUV: strong red

CCF Reaction

Pink: weak red

Pleochroism

Dichroic, moderate, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.018

Comments

Sapphire (Synthetic Floating Zone) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

floating-zone

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic Floating Zone) 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 that are not perfectly round and swirls of color.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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