Always position the GemCam closer to fill ~70% of the image with the jewelry.
Adjust the distance between GemCam and GemLightbox Pro based on the size of the jewelry.
Distance : 0-5cm
Distance: 5-10cm
Distance: 10-15cm
Yes, larger pieces can be captured however they may be harder to photograph completely in a single frame as the GemCam is designed for Macro (close up) photography.