Sapphire (Synthetic - Flame Fusion) | Gemopedia

The flame fusion process for creating gems, also called the Verneuil process, is the most affordable and common synthesis method for producing corundum (ruby and sapphire) and spinel. Powdered chemicals (the building blocks of the gem) are dropped through a high-temperature flame. The molten powder repeatedly falls from the flame onto a rotating pedestal, creating a synthetic crystal, called a boule, which can later be faceted into a gemstone. 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 Sapphire
Colors
Light Violet-Blue, Blue, Strongly Green-Blue

Sapphire (Synthetic - Flame Fusion) Classification

Common Name

Sapphire (Synthetic - Flame Fusion)

Species

Corundum

Variety

Flame-Fusion Synthetic Sapphire

Colors

Light Violet-Blue, Blue, Strongly Green-Blue

Alternate Names

Lab Created Sapphire

Gemstone Groups

Key Separations

refractive index, birefringence, pleochroism, magnification with immersion and spectrum

Comments

Stones might show polishing marks and poor polish. The stones will tend to be cut in calibrated sizes and with be symmetrical.

Sapphire (Synthetic - Flame Fusion) 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: weak to moderate chalky blue to blue-green to yellowish green
LWUV: inert

CCF Reaction

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.018

Comments

Sapphire (Synthetic - Flame Fusion) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

flame fusion

Crystal System

Trigonal

Classification

Carbonate

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic - Flame Fusion) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

3.95-4.1 Typical:4

Toughness

Excellent

Inclusions

Might show face up color zoning, curved striae that crosses facet junctions and strings of gas bubbles that might be mistaken for needles. It might be possible to see Plato lines or twinning planes under magnification and immersion with polarized light. Sometimes heated with borax to created fingerprint like inclusions to mask curved striae. Stones might show colorless areas and uneven color distribution.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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