Type IIa diamonds; jewelry incorporating Type IIa diamonds. Type IIa diamonds for use in the manufacture of the following goods, all of which contain the Type IIa diamonds, namely, diamond coated drill bits, diamond coated bearings, diamond coated wheels, diamond coated files, diamond cut-off wheels for machines, diamond cutting tools, diamond tipped cutting tools, diamond tips for tool bits, diamond tools for cutting, diamond tools for drilling, diamond tools for grinding, diamond tools for milling, diamond tools for polishing, diamond turning machines, diamond turning machines for lathing intraocular lenses, diamond turning machines for lathing of contact lenses glaziers' diamonds being parts of machines, diamond cut-off wheels for hand-operated tools, diamond cutting tools for hand-operated tools, diamond drill bits for hand-operated tools, diamond tips for tool bits for hand-operated tools, diamond coated cutting wheel for granite cutting, for hand-operated tools, glaziers' diamonds being parts of hand tools, diamond heat sinks for use in computers for conducting heat away from electrical components, diamond semiconductor substrates and wafers, diamond transmission windows for transmitting microwave and terahertz frequencies, diamond computers, diamond photon and particle detectors for the detection of radiation, diamond electrodes for chemical sensing, diamond electrodes made from synthetic materials for the measurement of chemical compounds, diamond electrodes not for medical use made from synthetic materials for the measurement of ions, diamond electrodes for oxidation reduction measurement, diamond electrodes for use in electrochemistry, diamond electrodes not for medical use for use in the electrolysis of liquid electrolytes, diamond safety glasses for use with high power lasers, boron-doped diamond semiconductor substrate. doped N-type diamond semiconductor substrate, diamond surgical knife blades