Synthetic Ruby Overgrowth On Natural Corundum Seed | Gemopedia

Synthetic refers to a man-made material with a natural counterpart that shares the same (or nearly identical) chemical, optical, and physical properties. Synthetic ruby may be created in a laboratory process that involves coating a natural corundum seed with feed material. During the process, a layer by layer grown occurs on the seed crystal.
Colors
Orangy Red, Red, Purplish Red

Synthetic Ruby Overgrowth On Natural Corundum Seed Classification

Common Name

Synthetic Ruby Overgrowth On Natural Corundum Seed

Species

Corundum

Variety

Synthetic Ruby Overgrowth On Natural Corundum Seed

Colors

Orangy Red, Red, Purplish Red

Alternate Names

Gemstone Groups

Key Separations

magnification with immersion and RI, birefringence

Comments

Stones will have OTL RI where the chromium rich overgrowth layer remains.

Synthetic Ruby Overgrowth On Natural Corundum Seed Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.762-0
Tolerance:(+0.009/-0.005)

Birefringence

0.008-0.01

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert
LWUV: inert to weak red

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: moderate fire Value: 0.018

Comments

Synthetic Ruby Overgrowth On Natural Corundum Seed Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

overgrowth hydrothermal

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Synthetic Ruby Overgrowth On Natural Corundum Seed Characteristic Physical Properties

Hardness

9

Streak

Specific Gravity

3.95-4.1 Typical:4

Toughness

Excellent

Inclusions

Color on these stones is strong table up but patchy on the pavilion when viewed on a white piece of paper. The stones have wavy growth that can appear step like or crystalline. One might be able to see facet junctions of the original stone underneath the overgrowth layer that do not match the facets of the outer layer. Stones will probably show uneven color due to removal or the overgrowth layer. They have a mottled or roiled texture when stone is viewed with immersion.

Luster

SubAdamantine

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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