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Perfect Carat Size for a Round Brilliant?

For me it is more occasion dependent. My currently favorite erring is 0.53. But I stand in front of the closet every day holding jewelry in front of my outfit to figure out what to wear. I tend to only wear my 1 or 2 cts diamonds when I’m wearing long sleeves.
 
My forever perfect carat size would be in the range of 3.5 closer to 4 carat range for a RB. F colour and at least VS1+.
 
It depends on the setting...
 
My 1.5 ct Octavia asscher is the perfect face up appearance for me.
Asschers face up smaller than rounds of the same weight.
Therefore 1.2 ct would probably be a good weight for me in a round.
 
It depends. On lifestyle, job, fingersize, place you live, even on the day. I wear a 2ct (3ctw if sides are counted) most days, but where I live it‘s very unusual and it feels a bit much, really.
 
For me it is more occasion dependent. My currently favorite erring is 0.53. But I stand in front of the closet every day holding jewelry in front of my outfit to figure out what to wear. I tend to only wear my 1 or 2 cts diamonds when I’m wearing long sleeves.

Oh yeah, occasion definitely dictates it for me as well.
 
How long did you wear the 3 carat before deciding it was too big? I just upgraded to a 4.6 and DSS has already sunk in and it looks like 2.5 most days. I could probably go to 6 without batting an eye.
 
I really think upgrades require some adjustment time. My original e-ring was 1 ct, and that was about as large as anyone my age had at the time. I wore it for many years before my husband said I could get a new ring for an anniversary after I mentioned the idea of resetting the first one into a three stone ring. I then got a 1.6 ct which seemed huge, but I gradually got used to it. A few years later I got a 2.3 ct stone which also seemed huge and I was a little embarrassed to wear it at first. After almost 8 years, I'd be happy to go to the high 2 ct range. I don't think I could go above three carats in a round without feeling a little too outside my normal circles. However, I'd take a 4 ct emerald cut today. I love emerald cuts the most for 4+ cts.

In your case, there isn't that much difference in a 2.8 and 3 ct. I'd go ahead and get the 3 ct while you can!!!
 
I currently have a 2.5 ct and I'm a 4.5 ring size. If I had all the money in the world, I'd like a 3 ct with the same specs as my current diamond. For me, above 3 ct would be just too big in a MRB.

Like others have said though, I could definitely do larger than 3 ct in a different shape such as an EC.
 
There's no objective perfect size, it's totally subjective, whatever suits you best. There's the most common or popular size range, but if you're asking about small differences like whether 2.5 or 2.75 or 3 is perfect, that's even harder to answer.
 
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