Study on the Microstructure of the Pinctada martensii Pearls and Its Significance

Figure 2

Second electron images of the nacres of the different-quality pearls. (a)-(b) high-quality pearls; (c)-(d) medium-quality pearls; (e)-(f) inferior-quality pearls.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)