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Coober Pedy Rainbows

Coober Pedy Seam opal formation rough 12.00cts 17x13x11m Blue colours showing collect or carve Lot B4-A422

B4-A422

Delivery Info

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

Coober Pedy Seam Opal Formation Rough – 12.00cts, Blue Colours Showing (Collect or Carve)
Lot Number: B4-A422
Weight: 12.00 carats
Dimensions: 17 x 13 x 11 mm

Details:
Origin: Coober Pedy, South Australia
Type: Seam Opal (Formation Rough)
Body Tone: Light to medium base
Play-of-Colour: Blue fire visible
Form: Natural seam formation with shaping potential
Use: Collecting, carving, or careful trimming

Description:
This 12.00ct seam opal rough from Coober Pedy shows blue colour activity in a compact, nicely formed chunk. The material presents good potential for light carving, specimen display, or careful cutting. With colour clearly present, it’s a moderate-risk piece that offers flexibility in approach — ideal for carvers or those looking for a display-ready natural form.

⚠️ Gamble Grade B (Gamble) – Colour is visible with moderate cutting risk. Good potential for careful carving or select slicing.


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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