Emerald (Flux Growth) | Gemopedia

One method of synthesizing emeralds is called flux growth. During the flux growth process, flux, a substance that reduces the melting point of surrounding material, is combined in a metal-lined crucible with the elements that make up emerald. The crucible is heated until its contents are liquid and then it is allowed to cool very slowly. As cooling continues, the gem mineral crystallizes from the solution. Flux grown synthetic gems can take up to a year to grow to a facetable size, but the exceptional clarity of these gems is well worth the wait! 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
Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

Emerald (Flux Growth) Classification

Common Name

Emerald (Flux Growth)

Species

Beryl

Variety

Synthetic Emerald

Colors

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

Alternate Names

Gemstone Groups

Key Separations

Refractive index, birefringence, optic character distinguished beryl from other materials, but magnification is essential for separating synthetic beryl from natural material.

Comments

Misnomer: cultured emeraldChatham material: RI 1.561 to 1.564, Fluorescence: stones will show a weak to moderate red in LW and SW but stronger reaction LW.Gilson I material RI: 1.564 to 1.569, SG: 2.66; Gilson II material RI: 1.562 to 1.567, SG: 2.66Gilson I & II material: Fluorescence: generally stones show a weak to moderate red reaction under LW and SW, but with a stronger reaction to LW; other stones might have weak to moderate yellowish green, yellow or orange reaction under LW and SW.Gilson III material RI:1.57 to 1.579, Fluorescence: Inert, SG 2.68 to 2.69.Russian material RI: 1.559 to 1.563 Fluorescence: stone will show a weak to moderate orange-red reaction under LW and they are inert to SW, SG: 2.66

Emerald (Flux Growth) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.562-1.569
Tolerance:(+/-0.003)

Birefringence

0.003-0.005

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

red

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: weak fire Value: 0.014

Comments

Emerald (Flux Growth) Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

flux growth

Crystal System

Hexagonal

Classification

Silicate

Nature

Synthetic

Crystallinity

Crystalline

Comments

Emerald (Flux Growth) Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.66-2.69

Toughness

Good

Inclusions

Flux grown emeralds might exhibit residual flux inclusions that look like wispy veils, fingerprints with interconnecting channels and sometimes the inclusions will appear course or give a cloudy or cottony appearance. Stones often show 2-phase inclusions. Occasionally platinum crystals from the crucible can be seen in the stone. Sometimes synthetic phenakite or chrysoberyl crystals can form. Stones often show uniform growth planes.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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