Description
Variety: Natural Dark Opal (Type 1)
Body Tone: Dark N5
Brightness: Slightly Bright
Transparency: Opaque
Color: Multicolor
Shape: Oval
Profile: Low Cabochon
Origin: Lightning Ridge, Australia
Pattern: Mixed Pattern
Display: Weak or Blank from 1 Angle
Distribution: Over 80%
Inclusions: Loupe Visible Only
Specifications:
- MOHS Hardness: 4.5-6.5
- Polish: 2.15 ± 0.08-0.09
- Refractive Index (R.F.I.): 1.450 ± 0.020
- Specific Gravity: 1.98 – 2.25
- Carat Weight: 2.80 cts
- Formula: SiO2·nH2O
Additional Characteristics:
- Fracture: Conchoidal to Uneven
- Lustre: Vitreous to Resinous
- Fluorescence: May phosphoresce under long/short wave UV light
- Absorption Spectra: 660nm, 470nm
- Category: Mineraloid (Amorphous)
- Crystal Habit: Irregular ‘Nodular’ Veins
- Composition: Hydrous silicon dioxide (3-21% water by weight)
- Crystal Form: Amorphous, pseudomorph, botryoidal
This exquisite Natural Dark Opal from Lightning Ridge, Australia, features a captivating N5 body tone with a mixed multicolor pattern. The opal’s low cabochon oval shape and slight brightness enhance its natural beauty, making it a standout piece for collectors or jewelry designs. With over 80% color distribution and loupe-visible inclusions only, this opal exemplifies the charm of Australian opals.
As a mineraloid with unique optical and physical properties, including conchoidal fracture and vitreous luster, this opal is both scientifically intriguing and aesthetically mesmerizing. Perfect for investment or bespoke creations, its value is as much in its rarity as its natural beauty.
