Sapphire (Synthetic - Hydrothermal) | Gemopedia

Hydrothermally grown synthetic sapphires crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows. 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, Greenish Blue, Blue

Sapphire (Synthetic - Hydrothermal) Classification

Common Name

Sapphire (Synthetic - Hydrothermal)

Species

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.

Sapphire (Synthetic - Hydrothermal) 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: Inert
LWUV: Inert

CCF Reaction

If colored by chromium bright red

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.018

Comments

Sapphire (Synthetic - Hydrothermal) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

hydrothermal

Crystal System

Trigonal

Classification

Oxide

Nature

Synthetic

Crystallinity

Crystalline

Comments

Sapphire (Synthetic - Hydrothermal) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

3.95-4.1 Typical:4

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

Stability

Very Good

Fracture

Conchoidal

Cleavage

None

Comments

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