Diamond Tools California USA. Syntec Diamond Tools is a global leader in diamond tool design and manufacturing. We manufacture diamond tools to cut and drill reinforced and precast concrete, asphalt, refractories, ceramic, porcelain tile, natural stone including granite, marble, sandstone, limestone, quartz and bluestone. We also manufacture a range of floor preparation products, power saws, tile saws, core drill rigs and other types of machinery. Please call 760 737 7407 for more information.