Whether you’re in the market for a modest diamond or a whopper of an engagement ring to dwarf Mariah Carey’s bling, it’s always a good idea to be able to visualize what different sized engagement rings may look like on your hand. The folks at Erstwhile Jewelry gave us the ultimate guide to a round cut old European carat size from .5 carats up to just about 2.5 carats – because these are the most .