I've heard of SI1 being referred to as "frozen spit." I don't think I have ever seen one to give an opinion.
A nice SI1 G ideal cut is actually what the people at the diamond forums call the "sweet spot" for round diamonds. The cut makes the G look whiter and the round brilliance makes it appear eye clean. However, you have to better on clarity with other cuts.
----LOVE the ring Ace!----