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I have a rather simple glass material on a wine glass model, it renders perfectly fine in preview, but in final render it gets these black artifacts around edges.

I've checked other threads and tried tweaking the near/far clip but it doesnt seem to affect the issue. I've also upped the light paths to full global illumination.

Example: Preview render to left, final render to right

Material and render settings: Material to the left, render settings to the right

What could be the cause of this? Any help appreciated.

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The problem was smooth shading, as pointed out by Igor Tatarnikov and Hexbob6. I needed to apply an edge-split modifier to the problematic geometry to fix the issue.

See Why does the Minecraft-texture have black/dark borders in Cycles?

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Also try the setting in finalrender for number of refraction passes, A glass needs 4 at least. increase and check if improved.

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