Description
This dazzling Natural Dark Opal Type 1, sourced from the prestigious Lightning Ridge, exhibits these exceptional features:
- 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
- Category: Mineraloid (Amorphous)
- Cleavage: None
- Crystal Form: Amorphous, pseudomorph, botryoidal
- Crystal Habit: Irregular ‘nodular’ veins
- Composition: Hydrous silicon dioxide (3–21% water content)
- Density: 2.09
- Transparency: Transparent to opaque
- Fluorescence: May phosphoresce under long/short wave UV
- Fracture: Conchoidal – Uneven
- Group: Silicates; Tectosilicates; Silica Group
- Lustre: Vitreous to Resinous
- MOHS Scale: 4.5 – 6.5
- Polish: 2.15 ± 0.08-0.09
- Refractive Index (R.I.): 1.450 ± 0.020
- Specific Gravity: 1.98 – 2.25
- 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’s bright green-blue hues, mixed pattern, and transparent clarity make it an exquisite gemstone, ideal for fine jewelry or exclusive collections. Its natural beauty and premium quality highlight its value and timeless appeal.
Note: This valuation was conducted for insurance purposes and is for private and confidential use only. Reproduction or unauthorized use is prohibited.
