Sapphire (Synthetic Color-change) | 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 Color-Change Sapphire
Colors
Reddish Purple, Purple Incandescent Light, Grayish Blue In Daylight, Florescent Light

Sapphire (Synthetic Color-change) Classification

Common Name

Sapphire (Synthetic Color-change)

Species

Corundum

Variety

Synthetic Color-Change Sapphire

Colors

Reddish Purple, Purple Incandescent Light, Grayish Blue In Daylight, Florescent Light

Alternate Names

Lab Created Color-Change Sapphire

Gemstone Groups

Key Separations

color change, RI birefringence, magnification and spectrum. Will have a different spectrum than natural stones.

Comments

Sapphire (Synthetic Color-change) Optical Properties

Transparency

Transparent - Semitranslucent

Refractive Index

1.762-1.779
Tolerance:(+0.009/-0.005)

Birefringence

0.008-0.01

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: moderate orange to red or blue
LWUV: moderate orange to red

CCF Reaction

Pleochroism

Dichroic, moderate violet to pinkish brown

Dispersion

Strength: weak fire Value: 0.018

Comments

Sapphire (Synthetic Color-change) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

flame fusion

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic Color-change) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

4.1-3.95 Typical:4

Toughness

Excellent

Inclusions

Flame fusion color-change sapphire might have bubbles and curved striae.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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