I just bought a Canon 750D. The picture has too much noise. The detail/shine of the diamond is not really showing. I am also using a tripod and timer.
The lens is the EF-S 18-55mm ƒ/3.5-5.6 IS STM. The picture was taken at 55mm, for 1/20 sec at ƒ/22 and ISO 200. I used manual focus, with center-weighted metering.