Gemological services, namely, grading precious stones; Authentication of diamonds; Testing, analysis, and evaluation of diamonds, gems and gemstones to determine conformity with certification standards; Grading of precious stones; Grading of semi-precious stones; Authenticating diamonds; Authenticating gemstones; Authenticating semi-precious gemstones

'analysi':11 'authent':7,35,37,39 'certif':23 'conform':21 'determin':20 'diamond':9,15,36 'evalu':13 'gem':16 'gemolog':1 'gemston':18,38,43 'grade':4,25,29 'name':3 'precious':5,27,33,42 'semi':32,41 'semi-preci':31,40 'servic':2 'standard':24 'stone':6,28,34 'test':10

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