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Looking for some input on the dimensions of this round stone

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matty13

Rough_Rock
Joined
Jul 7, 2019
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A1B7A9DA-E572-416D-AC17-FBD362944FB4.png Hello.
New to this board as I came across it during my long bout of investigative research into a beautiful solitaire engagement stone. The posts I have come across on this forum seem to be very knowledgeable which is why I decided to make an account. I have done a pretty significant amount of homework for a regular retail consumer (I may also have a touch of OCD, lol). But clearly I am still a completely noice when it comes to gemology.
I have looked at numerous stones from many different retailers. The last place I shopped at came highly recommended. I was leaning closer to a G in color, a clean SI1 or VERY clean SI2, around 2 carats, with a triple excellent GIA grade.
I have recently been getting into the nitty gritty of HCA scores and specific dimensions which would be ideal for light performance.
My question is this... the jeweler showed me one specific stone which was literally shining from across the room as he walked it over to me. It was J in color, but was the clearest J I’ve ever seen (I almost didn’t believe him until he showed me the GIA report). It was also an extremely clean SI2 (very clean on top), and 2.56 carats. It was a very good cut, with excellent polish, excellent symmetry, and faint fluorescence. The measurements are 8.86 - 8.88 X 5.34mm. I will upload the proportions.
It scores very poorly with HCA, around a 7 I believe. But this was fascinating to me, because this diamond seemed to have remarkable light performance in person.
The table is definitely very large at 64%. I am puzzled how this diamond appeared so beautiful in person, but in terms of the proportions, it should not have that great of light performance, right?

Any input is greatly appreciated.

I plan to go down there after I get back from vacation in 2 weeks. I would like to look at some stones that are a little smaller in size with better clarity, color, and better proportions to compare.
 
Absolutely do not buy this stone. It might perform better than the ones you've seen, but you are likely comparing it with other (even worse) stones.

Most in-person brick and mortar stores don't have access to quality inventory (sadly), and try to push inferior diamonds on unsuspecting buyers. Also, jeweler's lights can make everything/anything look good.

I would only be considering stones that score below 2 on the HCA and are GIA XXX or AGS 0000.
Can you share your budget? We are happy to help you find options, but definitely don't continue working with this jeweler.
 
Budget is around 16k. Thank you for your input. I definitely plan on calculating HCA scores before I purchase anything. I’m very surprised that this jeweler showed me this stone as he came recommended from numerous respectable people who have bought diamonds from him in the past.
 
There is nothing good to say about this stone...the table is > its depth :knockout:, flat crown at 11.5% :knockout:, unfinished girdle. I think you need to look at some well cut stones. ;))
 
42 Pavillion = Light Leakage
 
matty13 said:
Budget is around 16k. Thank you for your input. I definitely plan on calculating HCA scores before I purchase anything. I’m very surprised that this jeweler showed me this stone as he came recommended from numerous respectable people who have bought diamonds from him in the past.
Click to expand...
Unfortunately, most people know very little about diamonds, and think terribly cut stones are great. They just aren't used to seeing ideal cuts so don't know what they are missing. That plus the jeweler's lights being misleading and making terrible stuff look good all works against you. I guarantee that the jeweler will try to argue with you about HCA, and will make up some crap about how all XXX stones are the same, etc, etc. He or she is wrong and either ignorant or knowingly lying to you. Either way, you are much better off shopping online from trusted vendors, OR working with a jeweler who is willing to bring in stones for you that you request (we can help you find ones with potential).

All the online vendors recommended here have generous return policies. So you can always order one and compare it to stones from your jeweler. I guarantee you'll be blown away.
 
Not 2ct, but will perform MUCH better than the stone you have. And because it is super ideal cut it will face up whiter than non ideal cut stones.

https://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-4049783.htm

If you're willing to go smaller, you can get a G color:
https://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3905121.htm

You are spending a good deal of money, and should try to get the best quality stone possible. That usually isn't found in the average GIA XXX from an in-person jeweler. You'll have to find a GIA XXX with a score under 2 on the HCA, OR an AGS 000.

Alternatively, you could go down in color to an I from a vendor like HPD (as good as whiteflash with similar policies).
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10753

HPD has a "see it to believe it" program where they ship the stone to you so you can look at it in your house, compare to other options, etc. I would DEFINITELY take advantage of that if I were you!
https://www.hpdiamonds.com/en-us/diamonds/diamonds-home
 
Thank you so much everyone for the input.

How are these measurements for a well cut stone... are these basically the parameters I should stay within?

Table 54-57
Depth 61-62.5
Crown 34-35
Pavilion 40.6-41
Lower girdle 75-80
Star facets 50-55
 
matty13 said:
Thank you so much everyone for the input.

How are these measurements for a well cut stone... are these basically the parameters I should stay within?

Table 54-57
Depth 61-62.5
Crown 34-35
Pavilion 40.6-41
Lower girdle 75-80
Star facets 50-55
Click to expand...

Some people argue that depth should be below 62.4, but yes generally you are right. Also I'm not sure you have to be super strict about lower girdle or star facets. It's mostly important to get the table, depth, crown, and pavilion to have the right angles.

Yes. However, it's not that simple. You have to make sure the angles are complimentary to one another and that it scores well on the HCA. Some combinations work better and others are worse. A combo that works well (with table and depth in the range above) is 34 crown with a 40.8 or 41 pavilion. On the other hand, 35 crown and 41 pavilion often doesn't work together. So you have to make sure that the angles work together rather than just being within the ranges.
 
Dancing Fire said:
There is nothing good to say about this stone...the table is > its depth :knockout:, flat crown at 11.5% :knockout:, unfinished girdle. I think you need to look at some well cut stones. ;))
Click to expand...
May I ask: What is an unfinished girdle? Thank you!
 
headlight said:
May I ask: What is an unfinished girdle? Thank you!
Click to expand...
UNfaceted. Notice the word "facteted" under slightly thick on this GIA report?...;))

thumbnail.ashx
 
Thank you for that! Is it a sign of poor craftsmanship to leave it un-faceted?
 
headlight said:
Thank you for that! Is it a sign of poor craftsmanship to leave it un-faceted?
Click to expand...
It is pretty unusual to see a unfaceted MRB nowadays. I wouldn't buy one. ;))
 
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