I recently got engaged and although I like my ring, I don't LOVE it. My main issue is that the center stone is small (.4 carat) and does not look proportional on my hand. Somewhere down the line (when we've dealt with our student debt) I'd love to look into "upgrading" to a larger center stone. Is this usually an option? The head of the ring is not one of those removable ones, but appears to be soldered between the two sides of the band. I'm not sure if it will make a difference but there are also small diamonds on the band on either side of the center stone. I've heard different things about whether or not heads can be replaced to accommodate larger diamonds, and would appreciate any info any of you might have!