Spinel (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
Flame-Fusion Synthetic Spinel, Alumag, Corundolite, Lustergem, Magalux, Radient, Strongite ,Wesselton, Simulated Diamond, Aquagem, Rozircon, Berylite, Dirigem, Perigem, Emerada, Erinide
Colors
Red, Yellow, Brown, Light To Dark Green, Grayish Green, Yellowish Green, Pale Pink To Pink, Light To Dark Blue, Greenish Blue, Violet, Mauve, Orange, Colorless

Spinel (Synthetic - Flame Fusion) Classification

Common Name

Spinel (Synthetic - Flame Fusion)

Species

Spinel

Variety

Flame-Fusion Synthetic Spinel

Colors

Red, Yellow, Brown, Light To Dark Green, Grayish Green, Yellowish Green, Pale Pink To Pink, Light To Dark Blue, Greenish Blue, Violet, Mauve, Orange, Colorless

Alternate Names

Flame-Fusion Synthetic Spinel, Alumag, Corundolite, Lustergem, Magalux, Radient, Strongite ,Wesselton, Simulated Diamond, Aquagem, Rozircon, Berylite, Dirigem, Perigem, Emerada, Erinide

Gemstone Groups

Key Separations

refractive index, SR nature commonly with ADR cross hatch effect, magnification, color filter and spectrum and possible fluorescence. An accurate RI reading can distinguish natural from synthetic spinel, which usually has a higher RI.

Comments

Colorless variety trade names: Alumag, Corundolite, Lustergem, Magalux, Radient, Simulated Diamond, Strongite ,WesseltonColored variety trade names: Aquagem, Berylite, Dirigem, Emerada, Erinide, Perigem, RozirconMisnomers: synthetic aquamarine, synthetic peridot, synthetic birthstone varieties, Jourado Diamond, Brazilian Emerald, Hope Sapphire. Red stones: RI 1.722 (+/-0.003) and SG 3.59 (+/-0.001)Pink, blue, violet, colorless and green stones: RI 1.728 (+0.012/-0.008) and SG 3.64 (+0.02/-0.12)

Spinel (Synthetic - Flame Fusion) Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.722-1.728
Tolerance:-1.5

Birefringence

0-0

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

synthetic blue spinel produes a strong red reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.02

Comments

Spinel (Synthetic - Flame Fusion) Chemistry & Crystallography

Chemical Name

magnesium aluminum oxide

Chemical Formula

MgAl2O4

Synthesis

flame fusion

Crystal System

Cubic

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Spinel (Synthetic - Flame Fusion) Characteristic Physical Properties

Hardness

8

Streak

White

Specific Gravity

3.57-3.7 Range:0.1/-0.03 Typical:3.6

Toughness

Varies

Inclusions

Flame-fusion spinel may contain thread like or angular gas bubbles. Red stones might show curved striae growth patterns or color banding but this is rare. Strongly saturated blue stones might show red flashes due to cobalt as coloring agent.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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