Diamond grinding a terrazzo floor -- good idea?

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I have a terrazzo floor in good condition yet it has a dull, flat look so I am considering having the terrazzo floor finished professionally.

One company is really pushing diamond grinding the surface with finer and finer grits. They claim it will leave a high gloss finish that protects the floor and lasts for years. They claim a sealant after the grinding is not necessary.

Help? Is this too good to be true? What's the truth on diamond grinding and the results? Should I consider other methods that would give a better result? Thanks in advance for a response.

Regards,
Loren