CVD single-crystal diamond usually uses methane and hydrogen as precursors, under high temperature (about 1000 ° C), atmospheric pressure (1 atmospheric pressure) or low pressure conditions, with single-crystal diamond substrate as the substrate, to grow single-crystal diamond in the way of gas phase epitaxial, the single-crystal diamond substrate used can be natural diamond, HPHT diamond or CVD diamond. The diamond single crystal with higher purity and larger size can be prepared by this method. We can provide D-E-F-G-H color CVD wool drill, the specific color can be determined according to customer needs, clarity VVS-VS, the current growth carats of 3.0-30 carats/grain.
| Drill size (mm) | Drill weight (ct/piece) | Can cut bare drill size |
| 7 x7x4. 0-4.4 | 3.5-4.0 | 1ct circle |
| 8 x8x4. 6-5.0 | 5.2-5.6 | 1.5ct round |
| 9 x9x5. 1-5.5 | 7.2-7.9 | 2ct circle |
| 10 x10x5. 7-6.2 | 10.5-11.5 | 3ct circle |
| 11 x11x6. 5-7.0 | 14-15.5 - | 4ct circle |
| 12 x12x7. 5 | 19-21 | 5ct circle |
| 13 x13x7. 5 | 23 to 25 | 6ct circular |
| 12 x9. 5 x6. 0 | 11-12 | 3ct ellipse 5ct Emerald |
| 12 x10x6. 0 | 12-13 | 3ct ellipse 5.5ct Emerald |
| 13 x11x6. 5 | 16 and 17 | 4ct oval 7ct Emerald |
| 15 x12x7. 0 | 20-23 | 6ct ellipse 10ct Emerald |
