Synthetic Diamond Classification
Hpht Synthetic Diamond
colorless, near colorless, very light blue, blue to grayish blue, light gray or green, light toned pink, dark red, pink to orangy or brownish pink to purplish pink, yellowish green to green to bluish green, light to dark brownish orange to yellow
polish luster, OTL RI, SR nature, magnification, positive reaction to diamond tester, cross shaped, square or hour glass shaped fluorescence patterns and advanced lab testing. ADR might be in cross shaped pattern.
HPHT=high pressure, high temperature Type IIb blue, colorless, yellow or green stones might be magnetic due to metallic inclusions.