Diamond (Synthetic - CVD) | Gemopedia

Chemical vapor deposition diamonds (CVD diamonds) are fairly uncommon. These synthetic diamond gems crystallize from a chemical-rich vapor due to a chemical reaction that releases carbon atoms. These carbons atoms are then free to bond to a diamond seed plate where they form crystals. 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 Diamond
Colors
Near Colorless, Faint To Dark Brown, Gray, Dark Blue

Diamond (Synthetic - CVD) Classification

Common Name

Diamond (Synthetic - CVD)

Species

Diamond

Variety

CVD Synthetic Diamond

Colors

Near Colorless, Faint To Dark Brown, Gray, Dark Blue

Alternate Names

Lab Created Diamond

Gemstone Groups

Key Separations

Advanced laboratory testing

Comments

Usually very shallow stones.

Diamond (Synthetic - CVD) Optical Properties

Transparency

Transparent - Opaque

Refractive Index

Over the Limit 2.417-2.417

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: weak to moderate orange to yellow orange
LWUV: Inert to weak orange to yellow-orange.

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.044

Comments

Diamond (Synthetic - CVD) Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

CVD

Crystal System

Cubic

Classification

Nature

Synthetic

Crystallinity

Crystalline

Comments

Diamond (Synthetic - CVD) Characteristic Physical Properties

Hardness

10

Streak

Specific Gravity

3.51-3.53 Typical:3.52

Toughness

Good

Inclusions

CVD synthetic diamonds are often inclusion free but might contain pinpoint brown or black inclusions. The black inclusions might be graphite. If a seed crystal is present there might be flux inclusions from a HPHT diamond.

Luster

Adamantine

Stability

Excellent

Fracture

Uneven

Cleavage

Perfect, in four directions

Comments

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