Opinion on Large Diamond

[Fez]

Hello all,

I'm a long time lurker on these forums but haven't posted much. I'm looking to purchase a stone and have found one with the following specifications and would appreciate the expert opinion of these forums:

Color: G
Clarity: VS2
Lab: GIA
Cut: Excellent
Polish: Excellent
Symmetry: Excellent
Table: 56%
Depth: 60.2%
Crown Angle: 33.5%
Pavillion Angle: 41%
Size: 3+ carats

I have seen photos/videos but have not been able to physically see the stone in person and don't have access to sarin reports, etc, etc. I've been told that it is "eye clean". The stone scores "excellent" on the HCA scale at 0.90. I've managed to negotiate (what I think) is a reasonably good deal for the stone at $18,500 per carat.

Any feedback is very much appreciated as I am apprehensive about purchasing sight unseen (although the vendor does have a good refund/return policy).

Thank you.

 

[Lore]

Welcome to the journey! It's an exciting one given how much knowledge there is on these forums and how much you can learn by reading the different posts.

If you've lurked on this forum then you'd know that the regulars prefer vendors like Whiteflash, James Allen or Brian Gavin Diamonds due to their high quality cuts and great customer service. These vendors also provide ASET and Idealscope images so you can be sure you're buying something with good light return. Are you set on this vendor and are there other reasons for why you haven't considered one of those vendors? I'd skip a vendor who is unable to provide light return data on a diamond, especially one at that price point!

Here is a 3+ ct stone from Whiteflash that is just a bit more money ($18626 per carat) than the one you're looking at, but with super ideal cut proportions.

https://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3802915.htm?source=pricescope

 

[whitewave]

Go read on the thread called beyond D/FL/xxx

 

[Todd Gray]

Color: G
Clarity: VS2
Lab: GIA
Cut: Excellent
Polish: Excellent
Symmetry: Excellent
Table: 56%
Depth: 60.2%
Crown Angle: 33.5%
Pavillion Angle: 41%
Size: 3+ carats

The 41.0-degree pavilion angle is one-tenth of a degree beyond my preferred range of 40.6 - 40.9 degrees but might be acceptable if the pavilion depth is under 43.5% which I find to be the critical tipping point where light begins not to strike fully off the pavilion facets.

However, the crown angle of 33.5 degrees is shallower than the 34.3 - 35.0 degrees that I prefer and as such, is likely to produce more brilliance, as opposed to more of a balance of brilliance and dispersion.

It might also result in some light leakage or heavier amounts of obstruction between the arrows pattern. Does the vendor provide ASET/Ideal Scope images? If so, please post them here.

Diamond cut quality can affect the price of a diamond by up to sixty percent and each cut grade represents a range or spectrum of possibility. Thus diamonds with tighter proportions and which exhibit a higher degree of optical precision command a higher market price (and also tend to exhibit better light performance).

 

[rockysalamander]

I concur with @Todd Gray that the diamond is outside my preferred ranges for buying a modern round without IS, ASET, Sarin, etc. The angles suggest that the stone may have leakage, but will have a more flat side-view than most prefer. It may also be less attractive when view up close over a diamond with a CA closer to 34. I have seen diamonds with these angles and I generally eliminate them (and 33/41.2).

If you post your "wants" and budget, we can link you to some additional options to consider. If you are not based in the US, make sure you post a budget in USD that subtracts and taxes/import charges if you need that budget to cover those (and note what country you are posting from). Its also useful to know what kind of setting you have in mind, including the number of prongs.

These are measurements to help you stay in ideal cut territory with a GIA excellent cut stone.
table: 52-57.5 (but I personally prefer under 57)
depth: 60-62.3 (consider 59.5)
crown angle: 34-35.0 (up to 35.5 crown angle can sometimes work with a 40.6 pav angle)
pavilion angle: 40.6-40.9 (sometimes 41.0 if the crown angle is close to 34)
Lower girdle facets between 75 – 80%

There is another 'type' of modern round called a 60/60 diamond with a crown and pavilion angle between 59-61. These can be quite nice and more spready and return more white light than fire, but they are harder to select strictly by the numbers and I like to see these in person and have an IS/ASET (you can buy your own).