Fractured-Filled Emerald | Gemopedia

Fracture filling is the filling of surface-breaking cavities or fissures with highly refractive colorless glass. This process may improve the appearance, durability and/or weight of the emerald.
Colors
Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

Fractured-Filled Emerald Classification

Common Name

Fractured-Filled Emerald

Species

Beryl

Variety

Fractured-Filled Emerald

Colors

Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

Alternate Names

Gemstone Groups

Key Separations

RI, magnification and possibly fluorescence

Comments

Never put emeralds in an ultrasonic cleaner.

Fractured-Filled Emerald Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.577-1.583
Tolerance:(+0.017/-0.017)

Birefringence

0.005-0.009

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: weak fire Value: 0.014

Comments

Fractured-Filled Emerald Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

Crystal System

Hexagonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Fractured-Filled Emerald Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.67-2.9 Typical:2.72

Toughness

Poor

Inclusions

If dye is added to the oil or polymer there will be dye concentrations in the cracks. Stones will have surface reaching fractures and you will see flash effect in dark field lighting. Sometimes you can see trapped bubbles in the filling material. Old stones might show whitish or yellowish discoloration of the filler.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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