These tiles are used in the Chettinad area for more than 100 years. These tiles are hand made, and there is no firing or use of electricity, hence very sustainable. The price range is around Rs. 55-60 per sq.ft. including the labour cost for laying. When I used these tiles for the first time, about 20 years ago, they were not popular (https://www.bennykuriakose.com/vishram-by-the-sea).
I have used these tiles extensively in my projects because they are very sustainable and beautiful. But now there are many manufacturers at the local level.
These tiles are not suitable for the use in bathrooms or wet areas. Various designs are possible and it is left to the imagination of the designer. Many of the designs are very similar to the Victorian Tiles used during the late 19th Century.