The noise depends from you lighting, materials, and kernel settings, so difficult to say from the render.
Also camera Imager settings can have an impact on noise.
Are you using Path Tracing or PMC kernel?
Please post some screenshots about light, diamond material, camera imager, and kernel settings ...

bepeg4d wrote:Hi,
probably you have overexposed pixels, try to increase the Saturated to white parameter, in the Camera Imager node.

ciao Beppe

it cleans out big noises but small noises can't be removed

could you explain me how to remove the colorful noises in the photo attached?
it happens when i add a spotlight to get bloom/glare effect.
i rendered maxsample up to 5000 but it didn't go away