Please don't base your assessment of what the majority of e-ring in the US are based on online pics. I'd say the AVERAGE stone size from observation will vary depending the area you are in. In my area, well below 1ct is the norm. I almost never see people (even older ladies) with rings larger than 1ct when I am out. But in large metropolitan areas like LA or NY, the average size will certainly be higher.
Personally, I love their rose gold so that would be my choice.
That said, if you are really looking to maximize the stone size you can get for your budget, Tiffany is not the most economical. The super ideal boutique vendors will afford you much more stone, and guaranteed light performance with their branded cuts for your budget. Just wanted to throw that out there.
But if it HAS to be Tiffany, and have the Tiffany name attached, and to be honest, given the new information about this being an anniversary present, the Halo'd emerald is much more of a celebratory, right hand ring that can also be worn on the left hand than the solitaire Harmony and it also looks really nice on you.
You might also look at the bezeled Jazz rings from Tiffany since this is an anni present. Adding a blingy band to your wedding set can really give it a boost, if that is what you are after.
