Description
Experience the allure of this Natural Dark Opal Type 1, an exceptional gemstone from Lightning Ridge, featuring the following characteristics:
- Variety: Natural Dark Opal Type 1
- Body Tone: Black N6 (12)
- Brightness: Bright
- Transparency: Transparent
- Colour: Green-Blue with normal tones
- Shape: Oval Outline
- Profile: Low Cabochon
- Pattern: Mixed Pattern
- Display: Weak or blank from one angle
- Colour Distribution: 70–79% coverage
- Inclusions: None
Physical Properties:
- Absorption Spectra: 660nm, 470nm
- Birefringence: None
- Cleavage: None
- Crystal System: Amorphous
- Crystal Habit: Irregular ‘nodular’ veins
- Composition: Hydrous silicon dioxide (3-21% water content)
- Lustre: Vitreous to Resinous
- MOHS Scale: 4.5 – 6.5
- Density: 2.09
- Specific Gravity: 1.98 – 2.25
- Transparency: Transparent to opaque
- Polish: 2.15 ± 0.08-0.09
- Tenacity: Brittle
- Fluorescence: May phosphoresce under long/short wave UV
- Fracture: Conchoidal – Uneven
- Streak: White
- Solubility: Methanol, humic, hydrofluoric acid
Valuation:
- Carat Weight: 4.94 Carats
- Price Per Carat: $404.52 – $492.23
- Total Value: $1998.34 – $2431.61
This opal, with its vibrant green-blue hues and outstanding clarity, is a sought-after choice for fine jewelry and collections. Its unique properties and origin make it a valuable investment in both elegance and rarity.
Note: This value assessment was conducted for insurance purposes and is intended for private and confidential use only.
