Strong absorptions from N-V centers were the main cause of a CVD synthetic diamond’s pinkish orange bodycolor.

Although this stone bore some superficial resemblance to moissanite, its gemological properties were consistent with HPHT synthetic diamond.

Melee diamonds can be efficiently screened for synthesis and treatment using infrared absorption spectroscopy, DiamondView imaging, and microscopy.

Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.

Ten loose pearls with interesting shapes and internal growth features were from Pteria-species mollusks.