1.06ct 'Chameleon' diamond, unset, the Gemmological Institute of America report # 15096567 States: colour: 'natural, fancy brownish greenish yellow, even'. Cut: 'cushion modified brilliant' Comments: 'the colour of this stone changes temporarily when heated, or when left in darkness for a period of time and is known in the trade as 'Chameleon' See Gci Gemological Centers diamond Grading report and Gia report