Synthetic Diamond | Gemopedia

Some gems, like diamond, are highly coveted but can be unattainable, especially in the sizes and quality people dream of owning. Synthetic gems offer you the best of both worlds. You get the beauty of a beloved, rare gemstone, but at a price you can afford. 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 diamond with little or no variation.
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

Synthetic Diamond Classification

Common Name

Synthetic Diamond

Species

Synthetic Diamond

Variety

Hpht Synthetic Diamond

Colors

colorless, near colorless, very light blue, blue to grayish blue, light gray or green, light toned pink, dark red, pink to orangy or 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.

Synthetic Diamond Optical Properties

Transparency

Transparent To Translucent

Refractive Index

Over the Limit 2.417-2.417

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

singly refractive, commonly with ADR (SR-ADR)

Fluorescence

SWUV: Red stones: weak to moderate orange or orange-red; some display green cross-like, square or hourglass shaped patterns and may phosphoresce.Blue stones: weak to moderate green, yellow or orange; phosphorescence might be moderate to strong yellow or blue and be long lasting.Green untreated: weak to moderate yellow, yellow green or orange and stronger than LW.Green irradiated: inert to weak to moderate green-yellow, yellow-green or green.Untreated yellow to orange: inert to green-yellow, yellow-green, green; occasionally displays weak yellow or greenish yellow phosphorescence.Yellow to orange irradiated: moderate to strong green, yellow-green, green-yellow or orange and might show persistant weak to moderate yellow or yellow-green phosphorescence.Colorless stones: weak to moderate green, yellow, blue or orange; this is the opposite of natural diamonds that have stronger LW reaction; Commonly phosphoresce 60 seconds or longer weak to moderate blue, yellow or green.
LWUV: Red stones: inert through moderate to strong orange or orange-red.Blue stones: inert to weak orange. Green untreated: usually inert to weak orange.Green irradiated: very weak to weak red-orange to orange-red.Untreated yellow to orange:inert.Yellow to orange irradiated: moderate to strong green, yellow-green, green-yellow or orange and might show persistant weak to moderate yellow or yellow-green phosphorescence.Colorless stones: inert

CCF Reaction

Pleochroism

Dispersion

Strength: moderate fire Value: 0.044

Comments

Synthetic Diamond Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

HPHT

Crystal System

Cubic

Classification

Nature

Synthetic

Crystallinity

Crystalline

Comments

Synthetic Diamond Characteristic Physical Properties

Hardness

10

Streak

Specific Gravity

3.51-3.53

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 Octahedral In Four Directions

Comments

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