These four heliodor cabochons display sharp eyes under incandescent fiber-optic illumination. Photo by C.D. Mengason. Four golden oval cabochons (figure 1) were submitted to the Carlsbad laboratory by ...

An 8.33 ct long rectangular heliodor, the yellow variety of beryl (ideally Be 3 Al 2 Si 6 O 18), was examined by the author. It was reportedly from the Zelatoya Vada mine in Murgab, Tajikistan; ...