shape
carat
color
clarity

Help needed on evaluating this 0.9 ct stone

That's a great price for that carat weight, I would inspect before buying though, sounds like there is a catch. Usually for an excellent cut diamond of that size, etc...it would total $ 9 grand. I would just let your hubby pick out your stone.
 
The angles are complimentary. Normally I would suggest an idealscope image but BN does not provide them. BN does have
a very good return policy if there is anything wrong with it.

Is there any reason you are going so high on clarity/color? You could probably drop down to a VS1 and not tell the difference.
Even most VS2s are eye-clean but sometimes you can see something from the side.
 
Having a picture and an idealscope would be best, but according to the HCA https://www.pricescope.com/tools/hca it scores very well, either a .8 or 1.0 depending on whether angles or percentages are entered. Any score below 2.0 is "worthy of further investigation".

It might not have the hearts and arrows pattern in the facets, which wouldn't affect performance. Having them or not is a preference.
https://www.pricescope.com/wiki/diamonds/hearts-and-arrows-diamonds

The diamond's results:

Factor Grade
Light Return Excellent
Fire Excellent
Scintillation Excellent
Spread Very Good
Total Visual Performance 0.8 - Excellent
within TIC range

Even though HCA grades cut more effectively than systems like the AGS, it does not yet factor in symmetry and minor facets. Having found a diamond that scores well, you should employ an expert appraiser to examine the stone. If you decide not to, then at least compare the diamond to others and/or view it through an ideal-scope.

A score below 2 (Excellent) means you have eliminated known poor performers (more than 95% of all diamonds). Your own personal preference may be for a diamond with an HCA score of 1.5 more rather than one with a lower score of say 0.5.

 
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