My impression, after reading PS for 6 years, is LK is another of those very well-cut but VERY overprice brand names, like Eightstar and Hearts on Fire.
We can credit LK for bringing the term, and category "Ideal Cut Diamond" back into the fore.
At a time before GIA cut grading, when slightly larger tables were thought of as the "best", LK brought back the smaller tables of the "Tolkowski" look
I know for sure they're still around- but I can't say I've seen them advertised much lately.
V.S. the run of the mill store diamond, they are stunning. If you have not done any homework and would like a brand to sort out the details for you, you could do far worse.
If you put in the effort to research and find a great ideal cut H&A stone, you may wind up with a diamond just as beautiful with significant savings as you are not paying for the brand name.
I asked because I received one as a gift. It does not have a grading report though? It comes with an appraisal stating it to be 0.43 ct, E color, and SI2 clarity. I am not sure how accurate this is. I did look at it under my ASET and it looks great!
It has a laser inscribed number...is there a way to look up this number?
MakingTheGrade got one in a Van Craeynest ring (second-hand) and posted pics somewhere here. It was AGS0 and looked like it had very crisp, thick arrows.
ETA: As for the inscription, you could try to take it to a jeweler that has a 30x microscope and see if you can read it well enough to write it down.
LKI has a rich history. Lazare Kaplan was Marcel Tolkowsky's cousin and LKI was actually the first large-scale operation to cut diamonds to Tolkowsky's "ideal" proportions as early as the 1920s.