Veneer and Crown Prep Step-by-Step

Veneer + crown preparation
initial preparation was executed using a chamfer bur color-coded - BLUE
Finishing was done using a chamfer bur color-coded - RED
The occlusal reduction was done using a Diamond egg-shaped Bur

[@md.irfanurrahman7257]

What should be the margin extension in case of crown preparation? Is it slightly below gingival margin?