Sapphire (Synthetic - Flux) | Gemopedia

Synthetic sapphire can be created in many ways, one of which is called flux growth. During the flux growth process, flux, a substance that reduces the melting point of surrounding material, is combined, in a metal-lined crucible, with the elements that make up a specific gem mineral. The crucible is heated until its contents are liquid and then it is allowed to cool very slowly. As cooling continues, the gem mineral crystallizes from the solution. Flux grown synthetic gems can take up to a year to grow to a facetable size, but the exceptional clarity of these gems is well worth the wait! 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
Violet Blue To Greenish Blue

Sapphire (Synthetic - Flux) Classification

Common Name

Sapphire (Synthetic - Flux)

Species

Corundum

Variety

Flux-Grown Synthetic Sapphire

Colors

Violet Blue To Greenish Blue

Alternate Names

Lab Created Sapphire

Gemstone Groups

Key Separations

refractive index, birefringence, pleochroism, magnification and spectrum

Comments

Sapphire (Synthetic - Flux) 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 - Flux) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

flux growth

Crystal System

Hexagonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic - Flux) Characteristic Physical Properties

Hardness

9

Streak

Specific Gravity

3.95-4.1 Typical:4

Toughness

Excellent

Inclusions

Platinum platelets from the crucible that appear metallic in reflected light but appear dark when stone is lit from behind. Flux is often white, brownish, yellow or orange but can be colorless. Flux inclusions can appear like natural fingerprint inclusions, wispy veils, comet tails, coarse globules of flux that can have a myriad of appearances from drippy, tubular or rod like or icicle looking, to clouds and minute particles, Stone might display angular growth zoning similar to natural.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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