Price difference per carat in large diamonds

[clcat120]

Hello all,

I am curious to know if there is some sort of rule of thumb of the price difference between each color grade among G-H-I-J colored diamonds that are in the 3-4ct range assuming the rest of the C’s are similar? I can find some general idea of 1-2ct but nothing above.

Finally, is there also some general observations of price difference per carat when the weight of the diamonds jump ove the whole carat or the half carat cut-offs? (e.g. 3.4ct vs 3.6ct)



Thank you for your inputs!

 

[david b]

The rule is simple, the bigger the diamond the more scarce it is the more expensive it is. 3.50 might cost more than 3, 3.95 will cost much more than 3 since it is almost 4 carats. in the whole numbers like 3,4,5, etc there is a price significant raise. But diamonds are not a a Gold ounce the price is many times determined by the original cost, by how fast the vendor wants to sell it, by the market demand and many other in trade variants.
For example in the Chinese market they like VVS stones but they do not want black pinpoints, only white. So actually there is no one price for each 3 carats H VVS2 and the variants are many.

 

[OoohShiny]

@sledge is the man for price per carat comparisons

There are also several pages in the Resources tab at the top of the page that may be of interest.

Garry H (Cut Nut) has previously posted some graphs showing the large spikes of diamond for sale at the whole and half-carat markers (compared to other sizes) so that clearly indicates that diamonds are being cut to retain weight and hit apparently important psychological hurdles. There has been a thread recently which discusses the potential for the HCA score to include reference to Spread (rather than carat weight) in order to try to move the focus away from such a practice.

 

[clcat120]

@sledge is the man for price per carat comparisons

There are also several pages in the Resources tab at the top of the page that may be of interest.

Garry H (Cut Nut) has previously posted some graphs showing the large spikes of diamond for sale at the whole and half-carat markers (compared to other sizes) so that clearly indicates that diamonds are being cut to retain weight and hit apparently important psychological hurdles. There has been a thread recently which discusses the potential for the HCA score to include reference to Spread (rather than carat weight) in order to try to move the focus away from such a practice.

Thank you! Could you please direct me to those resources?

 

[OoohShiny]

Thank you! Could you please direct me to those resources?

Top left hand side of this page, under 'Resources'


The chart of historic prices is useful:
https://www.pricescope.com/diamond-prices/diamond-prices-chart/#

but the Diamond Statistics page:
https://www.pricescope.com/diamond-price-stats
seems to offer you options that take you through to a page that says "Requested page was not found, please look at the content below"...

@Ella - please may I check if the issues with the second page linked to are on the radar?

 

[sledge]

Thanks @OoohShiny.

The simple answer is yes, you see a price per carat change for each C when all other C's remain the same. Additionally you will see price swings for magic carat weights.

This site is more comprehensive and can compile data faster than I can; however, to help you I searched the WF, BGD, HPD and VC for super ideals. Additionally I utilized RC to search for GIA XXX stones and filtered those selections by ideal proportions.

Below is the filter criteria used:

• Colors = G, H, I & J
• Clarity = SI1, VS2 & VS1
• Size = 2.85 carats to 4.20 carats
• Table = 54-57
• Depth 60-62 (would have opened to 62.4, but RC filter is limited and 63 is too deep)
• Crown = 34-35
• Pavilion = 40.6-41 (would have limited to 40.9, but again RC filter is limited to 40.8 or 41 and I didn't want to exclude the 40.9 candidates)

I think this gives a fairly good view of the CURRENT inventory available and what market prices are doing based on the criteria. FYI, I was pulling price data but did not do an angle comparison or analysis. If you get seriously interested in a stone, please post back with details so we can address that specific stone.

Google Sheets:
https://docs.google.com/spreadsheets/d/1oOV9nzgyKBie3bY4xHoXaJMUd5z53RA4i7ZT6ANmKGs/edit?usp=sharing

Screen Cap - All Data (from Excel, where I initially created it...Google Sheets was an add for the masses and ease of sharing ):


Screen Cap - Filtered Data:

 

[clcat120]

Thanks @OoohShiny.

The simple answer is yes, you see a price per carat change for each C when all other C's remain the same. Additionally you will see price swings for magic carat weights.

This site is more comprehensive and can compile data faster than I can; however, to help you I searched the WF, BGD, HPD and VC for super ideals. Additionally I utilized RC to search for GIA XXX stones and filtered those selections by ideal proportions.

Below is the filter criteria used:

• Colors = G, H, I & J
• Clarity = SI1, VS2 & VS1
• Size = 2.85 carats to 4.20 carats
• Table = 54-57
• Depth 60-62 (would have opened to 62.4, but RC filter is limited and 63 is too deep)
• Crown = 34-35
• Pavilion = 40.6-41 (would have limited to 40.9, but again RC filter is limited to 40.8 or 41 and I didn't want to exclude the 40.9 candidates)

I think this gives a fairly good view of the CURRENT inventory available and what market prices are doing based on the criteria. FYI, I was pulling price data but did not do an angle comparison or analysis. If you get seriously interested in a stone, please post back with details so we can address that specific stone.

Google Sheets:
https://docs.google.com/spreadsheets/d/1oOV9nzgyKBie3bY4xHoXaJMUd5z53RA4i7ZT6ANmKGs/edit?usp=sharing

Screen Cap - All Data (from Excel, where I initially created it...Google Sheets was an add for the masses and ease of sharing ):


Screen Cap - Filtered Data:

Thank you very much. I just bought an J, vs1, sq. emerald with 3.62ct weight. Trying to figure out if I got a good deal....

 

[Matilda]

the above information is awesome....

here are some links that I personally found useful

https://www.pricescope.com/diamond-prices/round

click on your 3-3.99 ct:

https://www.pricescope.com/diamond-prices/round#3-3.99

N.B. The price bracket ends at .99, then it will increase again

 

[Matilda]

Thank you very much. I just bought an J, vs1, sq. emerald with 3.62ct weight. Trying to figure out if I got a good deal....

yours seems to vaguely match the one on line 46 (final one) on spreadsheet

oh just noticed you bought an emerald cut whoops sorry that will be a bit different:


https://www.pricescope.com/diamond-prices/emerald#3-3.99

and quick search from pricescope realtime:

https://www.pricescope.com/diamonds...1&pageview=24&adv=false&days=100&cert_number=

 

[sledge]

Thank you very much. I just bought an J, vs1, sq. emerald with 3.62ct weight. Trying to figure out if I got a good deal....

I forgot to mention earlier, my results were also limited to faint/none fluor levels.

Well the chart I did was based on ROUND diamonds, so it's not much use to you. Sorry.

I'd research current inventory of existing & available stones and build something similar to my chart if you really want to know. Limiting your search to I/J and VS2/VS1 would help make it go a little quicker.

 

[clcat120]

yours seems to vaguely match the one on line 46 (final one) on spreadsheet

oh just noticed you bought an emerald cut whoops sorry that will be a bit different:


https://www.pricescope.com/diamond-prices/emerald#3-3.99

and quick search from pricescope realtime:

https://www.pricescope.com/diamond-prices/emerald#3-3.99

Thank you very much for sharing this resources. I acquired this ring with the center stone of 8.89 x 8.83 x 5.52 (has the presence of a 4ct); J; VS1; VG Polish; G Symmetry; 3.62ct; a very small culet. It is quite sparkly despite some leakage (I spotted two white lines in the homemade ASET). Funny thing is when I tilted the stone just a slightly little, I see different color patches under the scope...I also heard that you cannot really rely on ASET for emerald cuts (assuming that including sq. emerald)...

One appraisal said it is funny that the stone appears whiter under the grading light than office light (he said it is very odd as he has never seen something like this in his career). However, it could be the platinum setting...

 

[Matilda]

I forgot to mention earlier, my results were also limited to faint/none fluor levels.

Well the chart I did was based on ROUND diamonds, so it's not much use to you. Sorry.

I'd research current inventory of existing & available stones and build something similar to my chart if you really want to know. Limiting your search to I/J and VS2/VS1 would help make it go a little quicker.

well looking at the pricescope chart it seems there is approximately a $2000 difference between round vs emerald at J, 3-3.99, VS1

So not dissimilar!

 

[Matilda]

@clcat120

very very beautiful ring!! I will say that is Asscher cut not emerald so my previous info maybe not so relevant also haha but will be within a small range. Did you buy the ring all together? OR was the diamond a separate purchase?

does it have any fluorescence? I am new but I have seen in threads that fluorescence makes a lower colour appear whiter!!

 

[clcat120]

@clcat120

very very beautiful ring!! I will say that is Asscher cut not emerald so my previous info maybe not so relevant also haha but will be within a small range. Did you buy the ring all together? OR was the diamond a separate purchase?

does it have any fluorescence? I am new but I have seen in threads that fluorescence makes a lower colour appear whiter!![/QUOTE

Thank you. It has not Flu. I has been searching for a nice stone forever. I love the sq emerald/Asscher cut look. However, for 3 months, I didn’t not see a single stone that has a big spread. So when I saw this ring, I was like “omg... I’m getting it.” Lol.

However, now I don’t know how much the cut will play in pricing a stone of this size and fancy shape....

 

[Matilda]

@clcat other than the rough estimates charts and realtime search engine, fancy cuts do not seem to have a concrete definition of " perfect cut" and what the price "should be". Also the price will be higher in a shop and cheaper online, cheaper through a diamond dealer or from a previous owner.

It sounds like you have fallen in love!! I would say that you find it perfect and without being a sap, that is all that matters. After all, you gained 3 months of experience figuring out what asscher diamonds you did and did not like.....so your eye has been trained to detect a good cut and more importantly what YOU WANT AND LIKE!!
sounds like you are happy with your purchase which is awesome!

 

[sledge]

Lots of truth in what @Matilda is saying. It's easy to find a rather "identical" round diamond. Its tougher to find an Asscher that you love. Even if you found the same color, carat and clarity it likely would not speak the same to you.

I wouldn't play this game if I were you and instead be happy and confident in the purchase decision you made. Besides it has no benefit as the money is spent.

 

[clcat120]

@clcat other than the rough estimates charts and realtime search engine, fancy cuts do not seem to have a concrete definition of " perfect cut" and what the price "should be". Also the price will be higher in a shop and cheaper online, cheaper through a diamond dealer or from a previous owner.

It sounds like you have fallen in love!! I would say that you find it perfect and without being a sap, that is all that matters. After all, you gained 3 months of experience figuring out what asscher diamonds you did and did not like.....so your eye has been trained to detect a good cut and more importantly what YOU WANT AND LIKE!!
sounds like you are happy with your purchase which is awesome!

Thank you very much. Happy Thanksgiving!