Intense Blue Diamond with Very High Boron Concentration
A natural Fancy Intense blue diamond submitted to the New York lab shows the highest boron concentration ever reported in a natural specimen.
Yellow HPHT-Processed Rough Diamond
HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.
Treated Pink Type IIa Diamond Coloured by Red Luminescence
A type IIa colour-treated diamond was graded as Fancy brown-pink under daylight conditions and Fancy purplish grey under incandescent lighting, a colour change that resulted from HPHT annealing and irradiation.
Cape Diamond with Yellow Phosphorescence
A cape diamond examined in the New York lab shows rare yellow phosphorescence.
Treated Pink Diamond with HPHT Synthetic Growth Structure
A Fancy pink type IIa diamond showing cuboctahedral growth and greenish blue phosphorescence is shown to be a natural, treated coloured diamond.
Separation of Black Diamond from NPD Synthetic Diamond
DiamondView is used to differentiate a Fancy black natural diamond from its NPD synthetic counterparts.
Very Large Artificially Irradiated Yellow Diamond
Examination of a 59.88 ct irradiated yellow diamond, one of the largest irradiated diamonds identified by GIA.
Decay Kinetics of Boron-Related Peak in IR Absorption of Natural Diamond
The decay of the transient 2800 cm–1 absorption peak in a Fancy grey diamond is observed.
Coesite Inclusions with Filaments in Diamond
Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.
Evidence of Focused Beam Irradiation in Treated Pink Diamond
DiamondView imaging and photoluminescence spectroscopy offered evidence of focused beam irradiation in a pink diamond.