My girdle is faceted (I guess I thought all were) but I feel like it makes the dispersion of light better and it seems like mine sparkles from every possible spot because of it. Id think its a good thing.
I much prefer setting a stone with a faceted girdle. It is also easier to laser inscribe and laser inscriptions can wear off and you can never find them on a non polished surface. Not sure what it says about refraction, but it creates a clean face inside for the light to bounce off and I suspect it won''t take in as much colour from where the girdle touches the prong.
Not too sure though, but a nice clean medium thin girdle with even facets and which is perfectly even speaks a lot to me from a setters point of view. If nothing else you have a better chance of it being set nice & straight.
I, too, much prefer faceter girdles. A frosted or bruted girdle (unfaceted anyways) can slightly help the side-view appearance of a lower colored diamond (J or lower).
The girdle is the outside border of the stone. It''s the ''edge''. Sometimes this is polished with a series of very small facets that extend entirely around the stone and sometimes it has a frosted sort of finish. You can see the difference by looking at the stone edge on with a magifier. Mostly, faceting is a good thing but it''s not a major issue for most customers either way. On large stones it is almost always done and on very small stones it is almost never done.