Fracture-Filled Diamond | Gemopedia

Fracture filling is the filling of surface-breaking cavities or fissures with highly refractive colorless glass. This process improves the apparent clarity of a diamond.
Colors
Colorless, Gray, Light Yellow, Light Brown

Fracture-Filled Diamond Classification

Common Name

Fracture-Filled Diamond

Species

Diamond

Variety

Fracture-Filled Diamond

Colors

Colorless, Gray, Light Yellow, Light Brown

Alternate Names

Gemstone Groups

Key Separations

polish luster, OTL RI, SR nature, flash effect in darkfield illumination, magnification, positive reaction to diamond tester

Comments

Fracture-Filled Diamond Optical Properties

Transparency

Transparent - Opaque

Refractive Index

2.417-0

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Variable
LWUV: Colorless: Variable

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.044

Comments

Fracture-Filled Diamond Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

Crystal System

Cubic

Classification

Native Element

Nature

Natural

Crystallinity

Crystalline

Comments

Fracture-Filled Diamond Characteristic Physical Properties

Hardness

10

Streak

White

Specific Gravity

3.51-3.53 Typical:3.52

Toughness

Varies

Inclusions

Fracture-filled diamonds typically display flash effect or interference color flash in darkfield lighting. Inclusions in these stones are typically trapped gas bubbles, cloudy or discolored material in fractures, crackled or web-like texture. Stone will have drill holes that do not end at a bleached inclusion and there might be evidence of fillers.

Luster

Adamantine

Stability

Very Good

Fracture

Uneven

Cleavage

Perfect, in four directions

Comments

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