Irradiated Diamond | Gemopedia

Exceptional quality colored diamonds are rare and extremely expensive. However, naturally dark or tinted diamonds can be irradiated to create a more pleasing, uniform color. Modern irradiation practices leave diamonds vibrantly colored and non-radioactive, creating beautiful options for gemstone collecting and jewelry. Once a diamond has been irradiated it becomes very sensitive to heat, so jewelers need to take care when using a jeweler's torch.
Colors
Green, Brown, Blue, Yellow, Orange; Very Rarely Pink, Purple, Red

Irradiated Diamond Classification

Common Name

Irradiated Diamond

Species

Diamond

Variety

Irradiated Diamond

Colors

Green, Brown, Blue, Yellow, Orange; Very Rarely Pink, Purple, Red

Alternate Names

Gemstone Groups

Key Separations

Fluorescence, spectrum, polish luster, OTL RI, SR nature, magnification, positive reaction to diamond tester

Comments

Irradiated Diamond 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

Irradiated Diamond Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

Crystal System

Cubic

Classification

Native Element

Nature

Natural

Crystallinity

Crystalline

Comments

Irradiated Diamond Characteristic Physical Properties

Hardness

10

Streak

White

Specific Gravity

3.5-3.53 Typical:3.52

Toughness

Excellent

Inclusions

Diamonds can have naturals, naturals with trigons, bruted girdle surface if not faceted, bearding, sharp facet junctions, angular mineral inclusions, olivine, garnet, diopside, graphite mineral inclusions, parallel growth marks, color zoning, internal grainingRed irradiated diamonds will have an even distribution of color but might show color zoning associated with the facets. In blue stones the color is usually even but can be uneven with blue and colorless zones. Might show facet-related color zoning or color at the culet. Green stones show distinct color zone around the culet in a "umbella" pattern and color zoning that follows the facet junctions.

Luster

Adamantine

Stability

Good

Fracture

Step-Like

Cleavage

Perfect, in four directions

Comments

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