bid4opal
Huge Rub/rough opal 38.00cts Lightning Ridge Dark Base knobby 39x24x7mm some fires flashes only Lot B4-A394
B4-A394
Delivery Info
UK: 2-3 days; International: 7-14 days
Lot Title: Huge Rub/Rough Opal – 38.00cts Lightning Ridge Dark Base Knobby, Some Fire Flashes Only
Lot Number: B4-A394
Weight: 38.00 carats
Dimensions: 39 x 24 x 7 mm
Details:
Origin: Lightning Ridge, New South Wales
Type: Knobby Opal (Rub/Rough)
Body Tone: Dark base
Play-of-Colour: Occasional flashes of fire
Form: Large rub-style knobby
Use: Carving, testing, or exploration gamble
Description:
This hefty 38.00ct Lightning Ridge dark base rub/rough presents a broad surface with a few scattered fire flashes showing. While not a confirmed cutter, its large face area and body tone make it a worthy gamble for those chasing hidden bars or planning for carving work. A great piece for those who like to explore potential in high-volume Ridge material.
🎲 Gamble Grade C (Gamble) – Some flashes visible, but no defined bar. High risk with exploratory potential.
Grade Key
Grade Description
🔥 A+ Clear visible colour bar, low-risk cut, high gem potential
🔥 A Strong face showing, low to medium risk, good cutting yield
⚠️ B Colour visible, moderate risk, requires careful cutting
🎲 C (Gamble) Some colour hints, unknown depth/consistency, high risk
❓ D (Blind Gamble) No visible colour, full risk – mystery piece
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