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It also depends on the color of the diamond. If you're talking about a fancy yellow colored diamond a yellow gold bezel setting will make it look larger. A white metal bezel setting will make a white diamond look larger. A bezel-set diamond will return somewhat less light than a prong-set diamond but if it's cut well enough you probably won't be in want of fire and brilliance.
Also, a bezel setting in platinum will make a white diamond look smaller than the same diameter diamond set in white gold or silver because less platinum is needed to adequately secure the diamond, although it will still look larger than if it were set in prongs.
This is my opinion. People have really different opinions on this subject I find.
I think a stone set in a bezel looks bigger--from a distance.
And for me it has to be quite a distance. When you get at all close, it just looks like a stone set in a bezel. And I personally don't like bezels much. I've seen one or two exceptions (where the bezel was milgrained or something like that) but usually this looks totally uninteresting to me. I also feel that the diamond being closed in cuts off a lot of the light and reduces sparkle. When I see a diamond in a bezel, I tend to think that the wearer was straining to make it look bigger ( a feeling I also have with most--not all,but most--halo settings) and/or the diamond has some kind of flaw that they are trying to hide by covering up so much of the stone. Or else is really yellow in a bad way (some lower colored diamonds look good to me, but a lot of them don't)which you can see mainly from the sides, so they are covering up the sides.
I dislike bezels in rings and in pendants more than in earrings, I don't know why.
All of this is of course very subjective.
But in general, I like high-set stones, even though this look is not all that practical and seems to be going out of style. The exception is, I love filigree style antique rings, and I also love the little illusion style '40'srings. In both these styles, the workmanship isoften so lovely that the last thing I think about is the size of the diamond. They don't have that 'stamped out of a machine' look that modern bezels tend to have to me.
When a bezel looks crafted and handmade (like some Gurhan rings, though I feel he is very over-priced), I often like that look. But usually with colored stones, rather than diamonds.
P.S. I agree that its not reasonable to say that a well-cut H is 'not white'. I think its generally agreed that a stone is white enough to set in platinum or WG down to I (GIA or AGS I, anyway) and I have seen J's set in white metal that lookd just fine.
I don't want to speak for anyone else, but I think what the previous poster meant was that a platinum bezel would be smaller than white gold because platinum is stronger and it takes less to securely hold the stone. Therefore, the enlarging effect of the platinum bezel wouldn't be as great as the enlarging effect of a WG bezel simply because it would be thinner/smaller.
and ame: you hit more things with low set? really??mmmm I DO LOVE HIGH SET RINGS............................ hahahaha..