The look is mainly created with rapid light falloff. Place a relatively small, soft light source very close to the grapes—roughly around 1 foot away for a small setup. When the light is close, exposure drops off quickly with distance, so the subject stays bright while the sides and background fall into darkness.

A close light also wraps more softly around the grapes, which helps keep detail and gives gentler highlights instead of harsh, specular reflections. Because the subject is small, you likely don’t need a very large modifier; a small softbox or similar soft source can work well.

To keep the background black, use distance between subject and background, a dark backdrop, or shoot in a dark environment so only the grapes are lit. If needed, you can deepen the background further in post with a soft mask and by lowering shadows/blacks, but the core effect should come from lighting placement rather than heavy editing.