Fig. 1. Surface morphology of diamonds from the Western Yangtze craton
(a): Triangular growth lamella; (b): Shield sheet; (c): Serrated grwoth pattern; (d): Peak cluster triangular hill;(e): Spiral growth pattern; (f): Inverted triangle pit; (g): Hexagon pit; (h): Quadrilateral pit;(i): Closed halo; (j): Fascicular halo; (k): Drop mound; (l): Small melting pit;(m): Erosion ditch; (n): Erosion channel; (o): Plastic deformation slip line; (p): Imbricate etch figure;(q): Collision trace; (r): Scratch

Fig. 2. Micro-FTIR spectra of the diamonds with different surface morphology
(a): Triangular lamella 1(001)-a; (b): Shield sheet 17(024)-a; (c): Shield sheet 45(305)-a; (d): Serrated growth pattern 15(021)-a;(e): Peak cluster triangular hill 6(007)-b; (f): Spiral growth pattern 15(021)-b; (g): Inverted triangle pit 16(023)-c;(h): Hexagon pit 16(023)-b; (i): Hexagon pit 16(023)-a; (j): Quadrilateral pit 6(007)-a: (k): Halo 13(017)-a;(l): Drop mound 35(204)-b;(m): Melting pit 41(301)-a; (n): Slip line 18(025)-a; (o): Imbricate etch figure 3(004)-a;(p): Imbricate etch figure 35(204)-a; (q): Triangular conical hill 24(056)-a

Fig. 3. Conversion rate change curve of total nitrogen (a) and B-center nitrogen (b) in diamonds with different surface morphology

Fig. 4. Related concentration of sp³(C—H) (a) and its relationship with B-center nitrogen (b) in dianonds with different surface morphology

Fig. 5. Variation curve of FWHM mean value of Raman eigenpeak of diamonds with different surface morphology

Table 1. Concentration of A-center, B-center and total nitrogen in diamonds with different surface morphology

Table 2. Concentration of hydrogen in diamonds with different surface morphology

Table 3. FWHM value and integral area of ~1 332.5 cm^-1 Raman shift of diamonds with different surface morphology