Emerald

Related: Beryl Varieties

AquamarineGosheniteHeliodorMorganiteRed Beryl

Key Differentiators

• Shows red through Chelsea filter
• Characteristic three-phase inclusions
• Low RI and SG

Natural vs. Synthetic

Synthetic emerald is commercially available (Flux (Chatham, Gilson), Hydrothermal (Biron, Linde/Regency, Pool), Lechleitner overgrowth). Distinguishing natural from synthetic typically requires microscopic examination of internal features.

• Microscopy — inclusions: Three-phase inclusions (solid+liquid+gas in one cavity) are definitive for Colombian origin. Also: jagged two-phase inclusions, actinolite needles, biotite, pyrite, irregular fingerprint fractures. Synthetic: Flux (Chatham/Gilson): wispy/cottony flux veils, platinum crystals (metallic reflective platelets), chevron growth patterns (Gilson diagnostic). Hydrothermal (Biron/Linde): nail-head spicules/chrysanthemum inclusions, comma-shaped two-phase inclusions, parallel growth tubes along c-axis. Lechleitner: visible interface between pale natural core and synthetic overgrowth; natural inclusions in core, hydrothermal features in rim.
• UV Fluorescence: Inert to weak red (LWUV). Iron-rich origins (Brazil, Russia) are typically inert. Low-iron Colombian may show weak red. Synthetic: Flux and hydrothermal synthetics: moderate to strong red (LWUV). High Cr content and near-zero Fe produces strong response. Strong red fluorescence is a red flag — but not conclusive alone.
• Chelsea Filter: Weak to moderate pinkish-red. Iron quenches the response. Synthetic: Strong vibrant red or purplish-red. Synthetics are high-Cr / low-Fe, producing a strong filter reaction. Some fine low-iron Colombian naturals can also show strong red — use microscopy to confirm.
• RI: nω 1.565–1.602; SG 2.67–2.78. Synthetic: Flux (Chatham/Gilson): RI nω ~1.560–1.564 (lower than natural — diagnostic). SG ~2.62–2.67. Hydrothermal (Biron/Linde): RI nω ~1.578–1.585 (higher end). SG ~2.67–2.75. A consistently low RI (<1.565) indicates flux synthetic; high RI (>1.580) suggests hydrothermal.

Common Simulants

• Green Tourmaline: Uniaxial negative DR; stronger dichroism; higher RI (1.624–1.644); SG 3.06; no red through Chelsea filter.
• Green Glass: Isotropic; gas bubbles, swirl marks or flow lines under loupe; no dichroism; conchoidal fracture.
• Synthetic green spinel: Isotropic SR; RI ~1.727; Chelsea filter typically red (synthetic spinel fluoresces); no dichroism.
• Tsavorite Garnet: Isotropic SR; no dichroism; RI ~1.740; SG 3.61; Chelsea filter inert (no red).

Commonly Confused With

Commonly confused with: Tourmaline, glass, Synthetic Spinel, Tsavorite Garnet, Chrome Diopside, Fluorite, YAG.

Treatments

• Cedar Oil / Natural Oil Filling
• Synthetic Resin Filling (Opticon, Permasafe)
• Epoxy Resin Filling (permanent)

Price Context

Price context is approximate. GemID is not an appraisal tool. Results are indicators, not certified valuations.

About Emerald

Emerald is the green to greenish-blue variety of beryl.