Ruby (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 Ruby
Colors
Slightly Orangy Red, Strong Red, Slightly Purplish Red

Ruby (Synthetic - Flame Fusion) Classification

Common Name

Ruby (Synthetic - Flame Fusion)

Species

Corundum

Variety

Flame-Fusion Synthetic Ruby

Colors

Slightly Orangy Red, Strong Red, Slightly Purplish Red

Alternate Names

Lab Created Ruby

Gemstone Groups

Key Separations

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

Comments

Flame fusion ruby might show poor polish and they are typically cut to calibrated sizes and with be symmetrical.

Ruby (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: strong red
LWUV: moderate to strong red

CCF Reaction

Pleochroism

Dichroic, moderate to strong orangy red and purplish red

Dispersion

Strength: moderate fire Value: 0.018

Comments

Ruby (Synthetic - Flame Fusion) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

flame fusion

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Ruby (Synthetic - Flame Fusion) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

3.95-4.1 Typical:4

Toughness

Excellent

Inclusions

Stones may display face up pleochroism, 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.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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