help me understand the difference in price between a 1.91 D SI1 with no fluorescence and a 1.77 D VVS1 with medium blue fluorescence. I just bought the latter and was wondering what rapaport says.
That said, you get MUCH better information as a consumer to be looking for direct comparable offers than to try and convert Rap into what a stone 'should' cost. That's a game for sellers and it almost always plays out badly. In terms of comps, there are dozens of offers of similar stones to both by just filling out the search form at the top of the page. Among other things, fluorescence isn't part of the Rap matrix but it's easy to include it in your search parameters.