Spectroscopic Analysis for Harnessing the Quality and Potential of Gemstones for Small and Medium-Sized Enterprises (SMEs)

Figure 6

Photoluminescence (PL) spectra of (a) pyrope-almandine garnet, (b) Quartz, (c) Black tourmaline, and (d) Amethyst.

(a)

(b)

(c)

(d)