bid4opal
Coober Pedy Potch 450cts Mostly Light base seam opal rough 22mm to chip size Lot B4-A386
B4-A386
Delivery Info
UK: 2-3 days; International: 7-14 days
Lot Title: Coober Pedy Potch – 450.00cts Mostly Light Base Seam Opal Rough
Lot Number: B4-A386
Weight: 450.00 carats
Size Range: Approx. 22 mm down to chip size
Details:
Origin: Coober Pedy, South Australia
Type: Seam Opal Rough (Potch)
Body Tone: Mostly light base
Colour Presence: No visible colour
Form: Mixed seam pieces and smaller chips
Use: Practice cutting, carving, or classroom/demo material
Description:
A large 450.00ct parcel of mostly light base seam opal rough from Coober Pedy, made up primarily of potch with no visible play-of-colour. Ideal as low-risk material for beginners learning the fundamentals of opal cutting, for lapidary practice, or as a bulk study lot for opal formations and host rock characteristics.
❓ Gamble Grade D (Blind Gamble) – No visible colour, full risk – mystery piece.
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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