Diamond grits synthesized under ultrahigh pressure have been commercially manufactured since 1957. Most of the diamond grits are for sawing rocks (granite, marble) and concrete. In 2004, more than 4 billion carats (800 tons) of diamond saw grits were produced worldwide. About 3/4 of total production was made in China, but the Chinese diamond grits tend to be smaller in size (<40 mesh) and with inferior quality, so their total value accounts for only 1/4 of the world sales (about $600 millions). The ultrahigh pressure process for synthesizing diamond grits is due to make a quantum leap: the raw materials will incorporate diamond seeds with a predetermined pattern. The result is doubling the diamond yield with a narrower size distribution. Moreover, the shape of diamond crystals can be precisely tuned. For example, diamond octahedra or diamond cubes, that are not available today, can be mass-produced. The new technology is now being implemented worldwide so the future diamond grits will have improved quality at reduced prices.