Black opal and diamond necklace, solid semi black opaque Lightning Ridge material 26.30 carats known weight and diamond pendant bezel set in a contemporary 18 ct yellow gold hand made mount, together with a 9 ct yellow gold solid cable necklet, valuation supplied, Provenance: The estate of Maxine Rava, all proceeds donated to 'The Maxine Rava Cannabis for Cancer Research and Health care Fund' at the Flinders University's 'Centre for Innovation in Cancer', Adelaide, South Australia