K to L, if you have non hazy but strong blue fluorescence, you may consider cuz it may look whiter or unique
and for that color range, dont go for regular 57 facet heart and arrows cut, if possible go for a more faceted one.. i.e. gabrielle, but i seriously doubt people would cut a strong color diamond with a gabrielle cut
if all that matters to you is carat size, look at the celistar series at SK jewellery, non GIA certified etc, have their own celistar cert, and is cheaper than most. occasionally you can find a good cut, but dont expect cut perfection, its not one of the diamonds you would expect to look good under a scope apart from the size. i saw a 1.06 carat, H color for abt $4k+ still sparkles cuz of size.
if you intend to give something of better quality, to be admired under a scope, then you may consider various cuts.
traditional cuts 57-58 facet types, with hearts and arrow cut ideality, you can look at lee hwa/goldheart/citigem's destinee, perfect love, polaris ice, arctic and at sookee/SK, you can ask for true love, fuego, etc. these are the more "ideal" cut diamonds. most will come with a scope for viewing
non ideal cut, all shops have.
modified cuts.. you can consider leehwa/goldheart/citigems.. rosella at 89 facets, perfect rose at 73 facet, celestial 73 facet.. destinee royal 81 facets etc.. at SK/sookee you can look at brilliant rose 66 facet... or charlotte attelier.. for the gabrielle...105 facet.. or the lazare diamond at larry jewellery. the lazare diamond is totally non heart and arrow, but ideally cut within some tolkovsky specs
you may also want to consider whether you want a diamond, that is big, or it is more brilliant... or has more fire.. diff cut.. diff specs.. but remember.. it doesnt mean more facet is good... cuz sometimes it can increase the possibility of light leakage etc.
