Chaos Corona for Cinema 4D > [C4D] I need help!

Layers compositing problem

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3dkobi:
Hi,
I have a jewelry store and I need to render 3 different images for my client:
1. Only the store (walls\floor\pictures on the wall\trees outside ect.) without the jewelry and without all the stands of the all the jewelry pieces.
2. Only the stands of the all the jewelry pieces without anything else.
3. Only all the jewelry pieces without anything else.
The client need the images in PNG with the correct alpha imbedded so that when he put the layers together the image will look perfect. Note that he can put them together only in "normal" mode (no linear dodge\screen or any other photoshop layer blend mode - he is doing that with python script for further use in a certain application)  - So I can't use the multipass system for that and export a PSD file. It has to be PNG.
Another thing to think about - for example, when rendering only the jewelry, I need that all the jewelry that is obscured by other objects (like the stands\store) will not be rendered.

The problem - No matter what I've tried, when I compose the Images There is a halo around the layer of the jewelry and the layer of the stands. Sometimes is a black halo, and in other methods is a transparent halo.
I've tried using the compositing tag and tick\untick the "seen by camera" on each render as needed.
I've also tried using the Include\Exclude option in the Corona render menu in the General settings tab.
Obviously I'm doing something wrong because it's only logical that I could do what I need....

So...What am I missing ? What is the correct way ?

davetwo:
Caveat - I'm not an expert in compositing - but there are things I would do differently.
1. Dont export direct to PNG. Make your comp in PS and export the PNGs from there...'
2. If time is not an issue just render the whole image and (not render selected), then use multipass masks to make selections of what you need.
3. if you absolutely must render directly with an alpha, try checking the 'straight alpha' box. that should give you less halo

3dkobi:
* Can't use multipass. This has to be a PNG solution
* Already tried to tick the "straight alpha" - didn't help

RecentSpacesSam:
try a direct visibility override with a more neutral colour than black

James Vella:
You need to pre-multiply the alpha in post.

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