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Looking to propose! What do you think of this diamond?

Sorry about the spammer above Smithy86. It has been reported to the mods and they will probably remove it soon. I am not an expert on evaluating a diamond, but hopefully someone will chime it to help you on this. I do love the idea of proposing with a diamond and then taking her ring shopping. How fun!!
 
I'm not an expert, but I think you can do better. This stone is pretty deep, which means, it won't look as big as it could for its weight. Also, the Crown Angle and Pavilion Angle are not a desirable combo because it's likely to adversely affect light return. There are some general guidelines that help guide you to a safe choice. Stick to GIA Excellent Cut or AGS Ideal with the following considerations:

depth - 60 - 62.3%
table - 54- 58%
crown angle - 34- 35 degrees
pavilion angle - 40.6- 41 degrees
girdle - avoid extremes, look for thin to slightly thick, thin to medium etc
polish and symmetry - very good and above
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I personally extend my search criteria to include tables up to 60, for the following reason:

quoting an old post:

A good recipe for a diamond that has more brightness and less fire would be to have a larger table, flatter crown and deeper pavilion. Something along the lines of:

Crown angle: 33.0
Pavilion angle: 41.0
Table: 59-60%
Depth: 58-61%

The benefit of the above proportions is that the stone should have a slightly larger diameter for it's weight, due to the 1-2% shallower depth than your average Tolkowsky cut.

But that angle combination sits on a cliff-edge; just a small increase in either crown or pavilion (or a rounding-off error) can dramatically downgrade the light performance. Definitely don't go for a stone that's exactly on a carat boundary, because you can bet that the cutter compromised the beaiuty to attain the weight. 1.02ct or more should be safer, since the cutter had a little extra weight to play with, to create a good stone.
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...and from another post:

here's a "Cliff's Notes" for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded): A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle. If pavilion angle = 40.6 lean toward a 34.5-35.0 crown. If pavilion angle = 41 lean toward a 34.0-34.5 crown.

GIA "EX" in cut is great at its heart, but it ranges a bit wider than some people prefer, particularly in deep combinations (pavilion > 41 with crown > 35).
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If you don't want to think too much, just get these numbers and plug it into the HCA Calculator (under Tools) and reject anything over 2. Anything under is worth further consideration.
 
I think you should NOT get it and start fresh here! Post what you're looking for and a budget.

The angle combination is not optimal, so they stone may not look as nice as you may want it to; also you want an excellent cut grade stone.
 
Yes, that stone is too deep and faces up like a .75 ct. stone. Stick with GIA Excellent cut only. That stone will also likely have leakage. I'd stick with 40.6-41.0 pavilion angle (and in some cases you might be able to go to 41.2 depending on the crown angle).
 
Thanks for the info everyone,

What I'm looking for, after a bit more research is a 0.60 carat, As close to D as possible and best clarity possible for no more than £1600

Thanks again
 
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