I doubt they have SARIN report. Did JP provide SARIN report for their Super Ideal?
I am sorry as i dont really get what you mean " if you can find diamond < 2.0 HCA score, and the diamond is not under "special" category as H&A james allen, ACA whiteflash, and so on, you found good deal already"
those diamond under "special" category are pre-selected diamonds thus carry higher price tag
sometimes there are diamond that have good HCA score but they miss to select it or maybe have one "flaw" (read : one category not under their range value for ideal diamonds)
e.g. table % too small or big, depth % to small or big (outside their ideal range)
though this diamond may still carry good HCA score and have good fire, scintillation and spread (remember based on HCA score only)
if you are buying online still this is good indication to continue your selection process by requesting detail SARIN report (if possible) and IDEAL SCOPE image
if you read the link that I shared for my experience looking for "value for money" diamond
I selected 2 diamonds after browse about hundreds diamond in JamesAllen.com (normal category not those H&A)
the diamond that I finally selected is having too big depth% but when I finally received the diamond, it is having good fire, sparkle for my noob eyes and much better compare to those diamonds sold by Singapore retailer stores
and to my suprise, when I borrow and use destinee loupe from my friend, I can see the "consistent" heart shape and size
0.77 I VS2 EX-EX-EX for less than 4100 SGD all in include GST (exclude ring)
pricescope wire transfer price (I ask my friend in US to wire transfer the payment, bank charged 25 USD)
James allen gives free shipping and insurance btw.
to be fair, James Allen H&A diamonds I still can find some is having HCA score > 2.0
goodoldgold.com seems having more strict selection, but carry higher price