Opal Endeavours

Natural Australian Boulder Opal & Opal Jewellery

Every Item Is Unique!

What is Boulder Opal?

Boulder opal is the term used to describe precious opal that has formed as part of ironstone boulders by impregnating the boulder and in-filling cavities and cracks (either partially or fully).

The opal quality may be uniform throughout the vein or may vary with different patterns and colours.  Potch bars or intrusions of potch and ironstone will affect quality.

The larger and more uniform patterns of colour are generally found in horizontal veins and pockets. The vertical veins generally produce bar patterns and can also carry gem colour and patterns.

Advantages of Boulder Opal

  • Generally cheaper than a similar looking black opal
  • Larger faces and stones are more readily available
  • Wider range of colours (eg: white, crystal, black)
  • Found only in Queensland, Australia


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    Australian Natural Gemstones on Stainless Steel
    Pretty sparkles of orange are seen across the bottom of this natural Australian boulder opal from our mine in western Queensland. It is complimented with four West Australian Mookaite beads coloured and solid sterling silver beads and fittings on a nylon coated stainless steel necklet.Comes giftboxed with FREE polishing cloth.Stone size: 14mm long x 12mm across at its widest point.Mookaite bead size: 4.5mm diameterSterling silver beads: 4mm diameterPendant length: 43cm
    Pretty sparkles of orange are seen across the bottom of this natural Australian boulder opal from our mine in western Queensland. It is complimented with four West Australian Mookaite beads coloured and solid sterling silver beads and fittings on a nylon coated stainless steel necklet.

    Comes giftboxed with FREE polishing cloth.

    Stone size: 14mm long x 12mm across at its widest point.
    Mookaite bead size: 4.5mm diameter
    Sterling silver beads: 4mm diameter

    Pendant length: 43cm (Opal and Mookaite Pendant)
      AUD$49.50
    Colourful Carbonised Sandstone Matrix (Fairy Opal)
    Solid Queensland sandstone matrix opal displaying sparkles of red amongst other colours. This also has solid pipes down the face of the showing pastel colours. This piece has been carbonised (blackened) to bring out the colour of the opal. It is found on the Queensland opal fields in association with pipe opal. It has been stabilised with polymer resin to maintain strength and durability.Stone size: 46mm x 24mm x 4mm thick.Stone weight: 71cts
    Solid Queensland sandstone matrix opal displaying sparkles of red amongst other colours. This also has solid pipes down the face of the showing pastel colours. This piece has been carbonised (blackened) to bring out the colour of the opal. It is found on the Queensland opal fields in association with pipe opal. It has been stabilised with polymer resin to maintain strength and durability.

    Stone size: 46mm x 24mm x 4mm thick.

    Stone weight: 71cts (opal FO010A)
       SOLD