Emerald (Synthetic-Hydrothermal) | Gemopedia

Hydrothermally grown synthetic emeralds crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows. 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 (Synthetic-Hydrothermal) Classification

Common Name

Emerald (Synthetic-Hydrothermal)

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

Russian product: RI 1.572 to 1.578 and 1.579 to 1.584, birefringence 0.006 to 0.007, SG 2.63 to 2.73Chinese product: RI 1.570 to 1.572 and 1.576 to 1.578, birefringence 0.006, SG 2.67 to 2.71Biron product RI 1.569 to 1.573(+/-0.001) some 1.570 to 1.578, birefringence 0.004 to 0.008, SG 2.68 to 2.71. Misnomer: cultured emerald

Emerald (Synthetic-Hydrothermal) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.571-1.584
Tolerance:(+0.007/-0.002)

Birefringence

0.004-0.008

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Sometimes bright red; not conclusive

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: weak fire Value: 0.014

Comments

Emerald (Synthetic-Hydrothermal) Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

hydrothermal

Crystal System

Hexagonal

Classification

Silicate

Nature

Synthetic

Crystallinity

Crystalline

Comments

Emerald (Synthetic-Hydrothermal) Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.63-2.73

Toughness

Good

Inclusions

Hydrothemal synthetic emerald often contains fingerprints, liquid and 2-phase inclusions, nailhead spicules, seed plates, opaque black hexagonal plates, synthetic phenakite or chrysoberyl crystals, gold inclusions, numerous red brown and fine white particles. The white material can also have the appearance of "comet tails" or stringers. In the Chinese and some Russian material wavy or chevron like growth can be seen.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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