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A boulder opal brooch

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The freeform opal, with raised panel surround.

Length 5.2cm. 15.9gm.

Condition Report:
Scratches and small marks.
Opal is within a closed back setting.
Opal appears bluish with fair to good bluish and green play of colour. Scattered matrix visible.
Fittings untested.
Electronically tests to reverse as approximately 23ct gold, possible interference from gilt finish.
Fellows uses a Thermo Scientific Nitron Handheld XRF Analyser to test metals. This technology is limited to examining metal to a depth of approximately 8 microns.
Fellows does not guarantee the standard of gold or platinum unless an item is hallmarked. Results from electronically tested items should only be used as a guide and with caution, as false readings are possible.
Please see the Important Notices for Purchasers for coloured gemstones.
Free virtual viewings are available by appointment. Please email jewellery@fellows.co.uk for more information and to book an appointment.
Condition reports are offered as a guide only and we highly recommend inspecting any lot to satisfy yourself as to its condition.
For any further questions you may have on this lot, please do not hesitate to contact Ben Randall at ben@fellows.co.uk

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Reserve
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Time, Location
14 Oct 2026
UK, London / Birmingham
Auction House
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[ translate ]

The freeform opal, with raised panel surround.

Length 5.2cm. 15.9gm.

Condition Report:
Scratches and small marks.
Opal is within a closed back setting.
Opal appears bluish with fair to good bluish and green play of colour. Scattered matrix visible.
Fittings untested.
Electronically tests to reverse as approximately 23ct gold, possible interference from gilt finish.
Fellows uses a Thermo Scientific Nitron Handheld XRF Analyser to test metals. This technology is limited to examining metal to a depth of approximately 8 microns.
Fellows does not guarantee the standard of gold or platinum unless an item is hallmarked. Results from electronically tested items should only be used as a guide and with caution, as false readings are possible.
Please see the Important Notices for Purchasers for coloured gemstones.
Free virtual viewings are available by appointment. Please email jewellery@fellows.co.uk for more information and to book an appointment.
Condition reports are offered as a guide only and we highly recommend inspecting any lot to satisfy yourself as to its condition.
For any further questions you may have on this lot, please do not hesitate to contact Ben Randall at ben@fellows.co.uk

[ translate ]
Reserve
Unlock
Time, Location
14 Oct 2026
UK, London / Birmingham
Auction House
Unlock