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open at the back allowing the light to illuminate this Opal perfectly
Diamond spray 5
Minor marks to silver here and there and are insignificant
Clasp 20mm x 14mm
Vintage 18ct Yellow Gold Phrenite Cabochon Ring open at the back allowingStrikingly unusual ring with a central stone which to all appearances looks similar to a Jadeite or even an Emerald but is in fact a rarely seen Phrenite! First described in 1788 for an occurrence in the Karoo dolomites of Cradock, Eastern Cape Province South Africa and named for colonel Hendrik Von Prehn (1733 1785). Extensive deposits of gem quality Phrenite also occur in the basalt tableland surrounding Wave Hill Station, Northern Territory,
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