Abstract
At the meeting of Gemological Institute of Japan 2001, Ms. Suzuki introduced that colors of fresh water pearls can be changed by heating.
Considering this result, we try to investigate the possibility of color change of sea water pearls and shells by heating.
The heating tests were actually executed by using Black-Lipped pearls and Black-Lipped shells this time.
We observed and recoded the change of pearl and shells colors for the series of time.
Also, we paid a lot of attention to the change of UV-VIS-NIR Reflectance Spectra.
