Most regions have their own prevailing construction methods and materials that are common and customary to that region. It may be driven by the available raw materials, local labor and their experience with a certain type of construction, and the cost of labor to build. Other factors that drive the different type of construction can be pressures from the environment and climate conditions. One can create recesses in masonry or stone walls but there may be structural weaknesses that become a factor or just more complicated construction that becomes involved. Building recesses in heavy masonry walls verses light stick framed walls can be equally possible. Reducing the thickness of a wall can also affect the insulation capabilities of that wall as well as the structure.

For the wall in the balcony I have shortlisted two stones A) Black leather finish granite B) Grey William granite. I am posting pictures of both. What can be pro and cons as I am looking for the exteriors wall only. Further for there will be window and steel/glass grill at wall of balcony so not sure whether book match pattern of grey William stone will work or not. I request whoever reading this to suggest which stone will look better at my elevation wall. Thanks a lot for reading this. Looking forward to get some positive suggestions.

that is what i have added if you can see the pic above.. want some suggestions on partition that i can use between dining and sitting

Veneer with White PU is a great Option. Alternatively you can go with Duco which is slightly cheaper than PU. Laminates always have a sharp edge unless done with the right expertise. Fabrics, if going with white, should be scotch-guarded. Mostly, white PU will work on table tops too, but if you want to use a sturdy option, go for white lacquered glass or White marble.