Description
Experience the allure of this Natural Black Opal Type 1, a genuine gemstone from the world-renowned Lightning Ridge, featuring:
- Variety: Natural Black Opal Type 1
- Body Tone: Black N4 (9)
- Brightness: Bright
- Transparency: Transparent
- Colour: Blue/Green with normal tones
- Shape: Oval Outline
- Profile: Low Cabochon
- Pattern: Mixed Pattern
- Display: Weak or blank from one angle
- Colour Distribution: Over 80% coverage
- Inclusions: Loupe visible only
Physical Properties:
- 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
- Carat Weight: 3.69 Carats
- Formula: SiO₂nH₂O
- Fracture: Conchoidal – Uneven
- Lustre: Vitreous to Resinous
- Fluorescence: May phosphoresce under long/short wave UV
- Absorption Spectra: 660nm, 470nm
Additional Information:
- Category: Mineraloid (Amorphous)
- Crystal Habit: Irregular ‘nodular’ veins
- Composition: Hydrous silicon dioxide (3–21% water content)
- Crystal Form: Amorphous, pseudomorph, botryoidal
Valuation:
- Price Per Carat: $160
- Total Value: $590.40
This opal’s bright blue-green hues, transparent clarity, and mixed pattern make it a captivating choice for jewelry enthusiasts and collectors. Its unique brilliance and natural charm highlight its value as a timeless gemstone.
Note: This valuation was conducted for insurance purposes and is intended for private and confidential use only.
