Pastel sky blue to deep sea-blue and greenish-blue, colored by trace iron within the hexagonal channel structure.
Chemical formula
Be₃Al₂(SiO₃)₆ + Fe²⁺/Fe³⁺
Beryl • Beryl
Emerald
Rich bluish-green to pure vivid green; trace chromium and vanadium impart the signature emerald hue.
Be₃Al₂(SiO₃)₆ + Cr³⁺/V³⁺ (Beryllium Aluminum Silicate with Chromium and/or Vanadium)Mohs 7.5 – 8.0 Mohs
Mineralogical & Gemological Profile
| Mineral Family | Beryl |
|---|---|
| Mineral Species | Beryl |
| Gemological Variety | Emerald |
| Chemical Composition | Be₃Al₂(SiO₃)₆ + Cr³⁺/V³⁺ (Beryllium Aluminum Silicate with Chromium and/or Vanadium) |
| Crystal System | Hexagonal (Dihexagonal dipyramidal) |
| Mohs Hardness | 7.5 – 8.0 Mohs |
| Specific Gravity | 2.67 – 2.78 (higher in high-iron/chromium schists such as Swat) |
| Refractive Index | 1.577 – 1.583 |
Color Characteristics & Optical Behavior
Rich bluish-green to pure vivid green; trace chromium and vanadium impart the signature emerald hue.
Geological Context & Pakistani / Global Localities
Forms where beryllium-bearing hydrothermal fluids or pegmatites interact with chromium/vanadium-rich host rocks (such as talc-carbonate schists in Swat Valley, Pakistan; Panjshir, Afghanistan; or black shales in Colombia).
Collector Interest & Rarity Factors
Swat Valley emeralds from Pakistan are renowned among gemologists for their saturated verdant green color and characteristic chromite, dolomite, and two-phase inclusions ('jardin').
Fine Jewelry Applications
Classic emerald-cut rings, halo pendants, and heritage settings. Protective bezel or corner-prong settings are recommended due to natural internal inclusions.
Treatment Considerations & Disclosure
Clarity enhancement using cedarwood oil, synthetic oils, or polymers to reduce the visibility of surface-reaching fissures is standard trade practice. FADI Gems discloses whether an emerald is oiled, resin-treated, or accompanied by a lab report stating 'no oil'.
Care & Cleaning Instructions
NEVER clean emeralds in an ultrasonic cleaner, steam cleaner, or with harsh chemical solvents, as these remove or damage clarity-enhancing oils. Wipe gently with a damp soft cloth and mild soap only.
Traditional Meaning
Traditional Symbolism & Cultural Heritage
Revered since antiquity in Mughal, Persian, and Egyptian traditions as a symbol of renewal, spring, eloquence, and discernment. Traditional May birthstone.
Note: Cultural and birthstone traditions are presented strictly as historical folklore, never as scientifically verified medical or metaphysical effects.
Beryl
Related Entries
Soft rose pink, peach, and salmon-pink hues caused by trace manganese; often forms flat tabular hexagonal crystals.
Chemical formula
Be₃Al₂(SiO₃)₆ + Mn²⁺/Mn³⁺
Lemon yellow, golden honey, to greenish-yellow, colored by ferric iron (Fe3+) substituting for aluminum.
Chemical formula
Be₃Al₂(SiO₃)₆ + Fe³⁺