Warranty or not. If you take good care of teeth and keep regular follow ups for treatments done, dental treatments last for several years. Cost is subjective to clinic, skill,experience, location and case specific mostly.

Cost varies clinic to clinic between 5k to 15k . I would advice if the tooth is not visible on smile go for metal ceramic crowns as its strength is more and not bad for posterior teeth and also cheap On the other hand zirconia crowns looks more natural cost is higher than metal ceramic but strength wise lesser and usually advised for front tooth where esthetics is more important Apart from it there is emax crowns which is better than zirconia , looks more natural and also better strength , the cost will again rise up as per the quality

I charge Rs 8000 with 5 years warranty and Rs 15000 with 10 years.