Diamonds can be used in the following ways:
Ornaments
Glass cutting and rock drilling machines
Diamond dust is used to polish other diamonds.
Diamond is used to construct windows in space
In artificial satellites that provide radiation protection
Diamond knives for eye surgery
Final answer:
Hence, diamond are used in ornaments, glass cutting and rock drilling machines, polishing other diamonds, constructing windows in space, artificial satellites that provide radiation protection, and in diamond knives for eye surgery.