Emerald (Synthetic Overgrowth Hydrothermal) | Gemopedia

Synthetic refers to a man-made material with a natural counterpart. The synthetic crystal replicates the chemical, optical and physical properties of the natural crystal with little or no variation. One of the most popular methods for creating synthetic emerald is the hydrothermal process, which uses heat and pressure to imitate natural conditions deep in the earth that formed natural gems. Nutrients are dissolved in a water solution with synthetic crystals forming as the solution cools. Synthetic emeralds offer you the best of both worlds. You get the beauty of a beloved, rare gemstone, but at a budget-friendly price!
Alternate
Names
Lechleitner Synthetic Emerald
Colors
Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

Emerald (Synthetic Overgrowth Hydrothermal) Classification

Common Name

Emerald (Synthetic Overgrowth Hydrothermal)

Species

Synthetic Beryl

Variety

Synthetic Emerald

Colors

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

Alternate Names

Lechleitner Synthetic Emerald

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. Overgrowth synthetic emerald reveals itself in differences between the natural seed core and the synthetic layer grown over the seed.

Comments

Misnomer: cultured emerald

Emerald (Synthetic Overgrowth Hydrothermal) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.566-1.57

Birefringence

0.006-0.006

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Weak to moderate red in the synthetic layer
LWUV: Moderate to strong red in the synthetic layer

CCF Reaction

Often a bright red; not conclusive

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Comments

Emerald (Synthetic Overgrowth Hydrothermal) Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

overgrowth hydrothermal

Crystal System

Hexagonal

Classification

Silicate

Nature

Synthetic

Crystallinity

Crystalline

Comments

Emerald (Synthetic Overgrowth Hydrothermal) Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.68-2.7

Toughness

Good

Inclusions

The colorless beryl core can sometimes be seen underneath the synthetic emerald layer. Immersion is sometimes helpful to detect the overgrowth or sandwich layers. Overgrowth stones will have natural emerald inclusions in the core and will have a poor polish to avoid removing the synthetic overgrowth layer. The surface of the stone might exhibit oriented strain cracks.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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