shape
carat
color
clarity

Looking for blue fluoresence

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
58,240
Has she seen K color? Because it is going to be tinted and not as bright as a higher color stone. I recommend higher than K for an engagement ring.
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
58,240
The third stone above is the only one of those that would be close enough to good cut parameters to consider.

These are measurements to help you stay in ideal cut territory with a GIA excellent cut stone.

table: 54-58

depth: 60-62.3

crown angle: 34-35.0

pavilion angle: 40.6-40.9 (sometimes 41.0)


Also, there is a screening tool for GIA ex cut stones:

https://www.pricescope.com/tools/hca

You want to see Excellent on light return, fire, and scintillation, and very good on spread. An overall score of 2.0 or lower means a diamond is worth exploring further (but a 1.0 isn’t necessarily better than 1.9).
 

JackSpider

Rough_Rock
Joined
Jan 31, 2016
Messages
10
Thank you for the guidelines

I seem to have trouble identifying very strong blue diamonds that are good

Would love to know your recommendations please
 
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