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(11)    Patent No :    AP 2720   
(21)    Application No :    AP/P/2009/005027   
(22)    Filing Date :    02.04.2008   
(24)    Date of Grant &    31.07.2013           
(45)    Publication :
(30)  Priority Data       
(33) Country    (31) Number    (32) Date
AU    2007901825    03.04.2007
(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s)

OPAL PRODUCERS AUSTRALIA LIMITED, 23 Church Street,

Dubbo, New South Wales 2830,
Australia
(72) Inventors

HORNABROOK Graham Alfred, Australia

MARCHANT Stuart Norman, Australia

LUMMIS Rodney Herbert, Australia

et al

(74) Representative

ADAMS AND ADAMS MOZAMBIQUE

MOZAMBIQUE
(51)  International  Classification   G01N 21/87 (2006.01)    G01N 21/00 (2006.01)
(54)    Title

Apparatus and methods for assessment, evaluation and grading of gemstones

(57)    Abstract

An apparatus (10) for assessment, evaluation and grading of gemstones has a

stage (11 ) upon which a gemstone may be supported, the stage being enclosed in a housing (15) that is impervious to light. At least one light source

(14) located in the housing is adapted to project incident light onto the

gemstone. There are means for rotating and tilting the stage so as to vary the

orientation of the gemstone to the incident light. A digital camera (16) is located in the housing adjacent the or each light source and is adapted to

take images of the gemstone based on reflection and/or refraction of the incident light. There are also information processing means for calibrating

and

(56)    Documents Cited :    WO 2007/069242 A1    WO 96/23207 A1    WO 2001/61316 A1    US 6239867 B1    WO

97/17603 A1

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