joroguery: the total carat weight is 0.25 or 1/4 carat.
jennylaw: since it's between a 7 1/4-7 1/2, and channel set, i don't know about the sizing. you might want to ask a jeweler.
i also measured the band with my digital calipers today, and it came up to 2.7mm on the front end where the diamonds are facing.
i am not sure of the color and clarity of the diamonds, but they are sparkly and the diamonds didn't look out of place next to my e-ring (which has g-i color side stones) when i used to wear them together. so i would estimate that the stones in the platinum band are also in that color range of g-i. the stones are pretty small, and they look eye-clean to me. no frozen spit (aka cloudiness) in these stones.
here's a couple pics of it together with my e-ring.
looking at these old pictures again, i feel real twinge of sadness at having to sell the ring. plat prices don't seem to be going down, and replacing the ring in future will probably cost me more. but i just fried my laptop motherboard this week and need to be able to afford the repairs.