Synthetic Sapphire | Gemopedia

Some gems, like sapphire, are highly coveted but rare to find, much less in the sizes and quality people dream of owning. Laboratory created jewels offer you the best of both worlds. You get the beauty of a beloved, rare gemstone, but at a budget friendly price. The term synthetic refers to a man-made material with a natural counterpart. The synthetic crystal replicates the chemical, optical and physical properties of the natural crystal with little or no variation. Just like natural gemstones, each full production of Jewelry Television's lab created gemstones is quality graded to ensure excellence.
Alternate
Names
Lab Created Sapphire
Colors
Violet Blue
, Greenish Blue
, Blue

Synthetic Sapphire Classification

Common Name

Synthetic Sapphire

Species

Synthetic Corundum

Variety

Hydrothermal Synthetic Sapphire

Colors

violet blue, greenish blue, blue

Alternate Names

lab created sapphire

Gemstone Groups

Key Separations

magnification, RI, pleochroism and maybe spectrum

Comments

Stones are colored by nickel and chromium and will have different pleochroism than natural stones.

Synthetic Sapphire Optical Properties

Transparency

Transparent To 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: colored by chromium: weaker redcolored by nickel: inert
LWUV: colored by chromium: redcolored by nickel: inert

CCF Reaction

If colored by chromium bright red

Pleochroism

Value: moderate to strong noticeably different from natural stones due to different coloring agents reddish violet and blue-green

Dispersion

Strength: moderate fire Value: 0.018

Comments

Synthetic Sapphire Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

hydrothermal

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Synthetic Sapphire Characteristic Physical Properties

Hardness

9

Streak

white

Specific Gravity

3.95-4.1

Toughness

Excellent

Inclusions

Look for chevron, wavy, zig-zag or mosaic growth patterns in hydrothermal synthetic ruby because stones might show growth zoning similar to natural ruby. Fingerprint like inclusions with 2-phase and 3-phase inclusions can be seen in stones. Sometimes flake like copper inclusions are visible in reflected light.

Luster

Subadamantine To Vitreous

Stability

Very Good

Fracture

Conchoidal

Cleavage

None, May Show Parting On Twinned Stones

Comments

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