the greenish-blue and brown colour of this stone contribute to its popularity. other colors are black, pink, grey and others, and beige. when used for building, the stone is mainly used for exteriors, but will also work when used for interiors. kota stone is the most in demand natural stone in india. the main market for kota stone is in the kudayla village of ramganj mandi tehsil in kota district of rajasthan, where there are more than one thousand processing units.