Spectroscopic Characteristics of Treated-Color Natural Diamonds

Table 1

Description of the treated-color natural diamonds used in this study.

	Sample number	Color	Weight (ct)	Clarity	Fluorescence to long-wave UV	Fluorescence to short-wave UV
Treated-irradiated	TR-1	Blue	0.4	SI2	Very weak blue, chalky	Invert
	TR-2	Dark green	0.24	SI1	Moderate green, chalky	Invert
	TR-3	Blue	0.24	VVS2	Invert	Invert
	TR-4	Dark green	0.36	VS1	Invert	Invert
Treated-HPHT	TR-5	Yellowish green	0.38	VS1	Greenish yellow	Moderate greenish yellow
	TR-6	Yellow	0.42	SI1	Weak blue, chalky	Invert
	TR-9	Greenish yellow	0.29	SI2	Blue, chalky	Greenish yellow
Treated-multiprocess	TR-7	Dark purplish pink	0.39	I1	Pink, chalky	Moderate orange
	TR-10	Dark purplish pink	0.35	SI2	Weak pink, chalky	Weak orange
	TR-11	Slight dark red	0.30	SI1	Very weak blue	Invert