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mining
Diamonds are the hardest substance on earth, making them the perfect drilling tool. Diamonds used in saws and drills are generally ones with imperfections, and would not make it onto a 15,000 dollar necklace.
Diamonds are primarily cut and used as gemstones in jewelry, such as rings, necklaces, earrings, and bracelets. They are also used in industrial applications as cutting tools for drilling, grinding, and polishing due to their hardness and durability. Additionally, diamonds are used in scientific and medical equipment for their unique properties, such as in high-pressure experiments and laser technology.
Laser drills may be utilized for a wide variety of applications. Most commonly though, they are used for fine and detailed work such as dental drilling.
Diamonds are used to cut -- cleve or saw -- diamonds. In higher-tech-equipped facilities a laser can be used.
Diamonds are primarily used in jewelry due to their brilliance and durability. Beyond aesthetics, they have industrial applications, particularly in cutting, grinding, and drilling tools because of their hardness. Additionally, diamonds are utilized in high-performance electronics and optics, including laser technology and as abrasives. Their unique properties also make them subjects of research in quantum computing and other advanced technologies.
laser
According to Wikipedia, diamonds can be altered by "...clarity treatments such as laser drilling to remove inclusions, application of sealants to fill cracks, color treatments to improve a white diamond's color grade, and treatments to give fancy color to a white or off-color diamond." You can read more about diamond enhancement, below.
laser
Apparently. You can read more, below.
Diamonds are very hard, so they don't wear or blunt much when drilling through softer materials.
Diamond-tipped tools are used in drilling and in precision work, because diamond is he hardest natural mineral on earth. About 80% of all diamonds mined are industrial diamonds, only useful for these purposes.