You have no items in your shopping cart.

Welcome to Alltribes.com!

Memorial Day Sale! 
Additional 20% Off!
( not available with other discounts )
"NO QUIBBLE GUARANTEE"
( Discount shows when product is Added to your shopping cart )

Boulder Opal Cabochons

Items 1 to 16 of 88 total

per page
Page:
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Grid  List 

Set Descending Direction

Items 1 to 16 of 88 total

per page
Page:
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Grid  List 

Set Descending Direction

Boulder Opal Cabochons

Boulder Opal Cabochon

Boulder Opal, found in Australia where the opal forms into veins and patches within brown ironstone boulders. When opal is mixed with the ironstone it's called matrix opal. The hardness of Boulder Opal ranges between 5.5 and 6 on the Mohs scale. Boulder opal is a very durable stone because of the ironstone backing the opal forms on. If the water content within the opal is low it almost never cracks or crazes as it ages.