On 6/17/2017 11:33 AM, omniverse wrote:
>
> I'll make it more difficult to decide by saying A or D instead of Thomas's B or
> C.
>
> I don't know anything about jewelry, especially rings, but I just always thought
> diamonds or clear gems were placed onto a setting with a reflective underside.
> Looking at pictures of ring settings just now it would seem to prove me mostly
> wrong.
>
> Many apparently have open space below the prongs, a hole in the ring itself, at
> least for this type of setting. I guess that's to allow more light around it.
> Maybe because light doesn't refract down and back up very easily??
>

I thought that too but I found this answer that makes sense, to me:

Without a Hole on the underside of the Shank, chances are good, the 
Sharp Point of your Stone would Break off during setting.

The Tapered Part of a Diamond is called the Pavilion. The Pavilion comes 
to a Sharp Point at the end. That Point is Fragile and can Chip Easily. 
Sometimes the Sharp Point has a Flat Facet on the end of it, called the 
Culet!

The Culet is only there to keep that Point from Chipping! If you exert 
any pressure on that Point during Setting, it can Break it right off and 
Crush it. Setting your Diamond into those Round Open Circles keeps your 
Diamond or Gemstone Aligned, and keeps the Stones from getting Broken.


-- 

Regards
     Stephen

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