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bid4opal

Lighting Ridge pair of Knobby opal formations rough 16.50cts Both have blues fires to chase & explore 18x14x6mm & 17x12x9mm Lot B4-A425

B4-A425

Delivery Info

UK: 2-3 days; International: 7-14 days

Lightning Ridge Pair of Knobby Opal Formations Rough – 16.50cts, Both with Blue Fires to Chase & Explore
Lot Number: B4-A425
Weight: 16.50 carats (total)
Dimensions:

  • Piece 1: 18 x 14 x 6 mm

  • Piece 2: 17 x 12 x 9 mm

Details:
Origin: Lightning Ridge, New South Wales
Type: Knobby Opal (Rough Pair)
Body Tone: Dark to medium base
Play-of-Colour: Blue fire showing in both pieces
Form: Natural knobby formations
Use: Trimming, testing, or carving

Description:
This 16.50ct Lightning Ridge knobby opal pair features blue fires visible in both pieces. While colour is present, full depth and structure of the bars remain to be explored. A great gamble lot for cutters interested in uncovering faces and chasing colour through Ridge material with natural shape and variation.

🎲 Gamble Grade C (Gamble) – Blue fire is visible, but bar depth and quality are uncertain. High risk with potential reward.


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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