Diamond (Synthetic - HPHT) | Gemopedia

High pressure, high temperature synthetic diamonds (HPHT diamonds) are produced in a way similar to synthetic flux grown gems, however, during the HPHT process, as the name implies, the growth chamber is exposed to high temperature and pressure. The diamonds then crystallize in a lower temperature section of the growth chamber. Colored diamonds can be produced in this way. 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.
Colors
Colorless, Near Colorless, Very Light Blue, Blue To Grayish Blue, Light Gray, Green, Light Toned Pink, Dark Red, Pink To Orangy, Brownish Pink To Purplish Pink, Yellowish Green To Green To Bluish Green, Light To Dark Brownish Orange To Yellow

Diamond (Synthetic - HPHT) Classification

Common Name

Diamond (Synthetic - HPHT)

Species

Diamond

Variety

HPHT Synthetic Diamond

Colors

Colorless, Near Colorless, Very Light Blue, Blue To Grayish Blue, Light Gray, Green, Light Toned Pink, Dark Red, Pink To Orangy, Brownish Pink To Purplish Pink, Yellowish Green To Green To Bluish Green, Light To Dark Brownish Orange To Yellow

Alternate Names

Gemstone Groups

Key Separations

polish luster, OTL RI, SR nature, magnification, positive reaction to diamond tester, cross shaped, square or hour glass shaped fluorescence patterns and advanced lab testing. ADR might be in cross shaped pattern.

Comments

HPHT=high pressure, high temperature Type IIb blue, colorless, yellow or green stones might be magnetic due to metallic inclusions.

Diamond (Synthetic - HPHT) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

Over the Limit 2.417-2.417

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.044

Comments

Diamond (Synthetic - HPHT) Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

HPHT

Crystal System

Cubic

Classification

Nature

Synthetic

Crystallinity

Crystalline

Comments

Diamond (Synthetic - HPHT) Characteristic Physical Properties

Hardness

10

Streak

Specific Gravity

3.51-3.53 Typical:3.52

Toughness

Good

Inclusions

Elongated or rounded opaque highly reflective inclusions of metallic flux that rarely might cause the stone to be slightly magnetic. There might be clouds and pinpoints of flux in Chatham blue material. There might be impurities that might show faint color zoning in cross-shaped or hourglass pattern. Darker red stones typically will show areas of color zoning with intersecting square or cross shaped yellow areas encompassed by red. Pink stones have pink and colorless zones and might show metallic inclusions with brown halos. Irradiated green stones might have even coloration.

Luster

Adamantine

Stability

Excellent

Fracture

Uneven

Cleavage

Perfect, in four directions

Comments

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