HELP!!! Must pay for diamond tomorrow... need last advice.

A well cut 1.20c stone should have a diameter of around 6.90mm or so and 1.31 should be around 7-7.05mm or so. So the second stone looks a little more like the true ctw from the numbers you have posted, but you'd need more info like crown and pavilion angles to really make an educated decision.

You didn't mention pricing...are they well priced?

The med-slightly thick is the girdle and that's a good range. VG VG for symm and polish is pretty good.

Good luck!

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"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

Compare prices using Pscope 'compare'....

The weight of the stones does weigh as specified. When I say the dimensions are off, I mean the 6.76-6.81x4.27mm
you posted for the first stone. A well cut 1.20c stone as noted should be more around 6.90mm x 4.15mm. Give or take a few tenths either way...for averages.

So what this means is that the top stone has a top diameter of 6.76-6.81mm when it really should have 6.90. So where is that extra carat weight going? To the pavilion. Where the depth is 4.27mm and it should be more around 4.15. That means the stone has extra carat weight in the bottom of the stone, where you can't see it...since you only see the top (diameter) of the stone. So the stone weighs the same, but you are not paying for weight you SEE...but rather weight you don't. Same with an overly thick girdle. Too thick of a girdle also adds weight to the stone, but you don't see that weight, its on the girdle..not the diameter or crown area.

The diameter of a 1.5c well cut stone should be around 7.45-7.50mm. If this stone you mentioned truly has a diameter of 6.80 (as an average), it defintely looks nothing close to how a 1.5c stone SHOULD look. Then again if you are shopping at a maul store (or brick and mortar or a chain), their 1.5c stones may be so badly cut that this 1.20c does look like a 1.5c..in which case the store is seriously ripping off some customers.

Anyway--the differences between what the stones are and should be seem better in the second stone, but I hope others chime in, esp experts in the field with their two cents to help you out as well! If you can get crown and pav angles, it would be very beneficial.

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"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

Ohhh experts??

Scorp: try to get crown and pav angles by telling the jeweler you want a Sarin report run on the stones. In order to try to get the sale, make this really clear...see if they will accomodate to get your business. If they don't have a machine, they should know someone who does.

Then you can run the crown and pavilion angles through the HCA and get a smidgen of a better idea on how these stones may perform. Did you see them in person? What is your gut feel and why?

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

Rhino
Good Old Gold

If you had to make a decision between the two stones with only the data given and a limited time frame, I would say go with stone #2...the 1.31c. The numbers look better to me...but then again I am not an expert nor in the industry...just a consumer who hangs around these forums WAY too much

Definitely get a second opinion as Rhino has suggested, esp if you are not able to get the crown and pav angles from a Sarin/Mscope report. An independent appraiser will help out for a fee (around $100-200) and give you more than you ever wanted to know about your stone! try to find one locally if possible so that you don't have to part with the stone. 'Appraisers' is a link at the top of this page, check it out for your area.

Lastly, I have to say don't worry about the size being too flashy. If your GF wants it, and you are willing to give it to her, enjoy the size! I have a 1.35c looking stone and I love it. I wish it was bigger!! But it's plenty flashy and I love that because in other ways I am pretty simple (jeans and flip flops all summer long!!), so my ring is my fun piece of jewelry that isn't understated.

Also insurance helps with the fear that something will happen to the ring. We got my ring insured, and all is well. No worries about little things like life happening to it.

Best of luck! Let us know what your decision ends up..and post pictures when you have your stone!

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

Good job Scorp!! Glad to hear your jeweler is willing to accomodate. Let us know the #'s!

Trichome

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

I don't know why you were having a problem entering the info into the HCA...I put it in and got back an excellent score!

1.2 EX TIC

EX fire
EX scintillation
EX brilliance
VG spread

Anything under 2.0 on the HCA is considered within the top 5% of diamonds...

Don't worry about minimal differences between the Sarin and the report..that is typical for the most part. I'd worry about HUGE differences but not minimal.

And BTW cut is the MOST IMPORTANT of the 4c's for the most part...it will dictate how your stone looks moreso than clarity and color IMO!

Good luck!

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

the crown angle is 35.2
the pav angle is 40.6

you are using the %'s which are not as accurate and you are probably not changing the angle to % in the pulldown when you are doing it, hence the HCA won't work for you.

try the data above.

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

________________________________

"Insanity: doing the same thing over and over again and expecting different results."

-Albert Einstein

Mara is right : 1.2, not 1.8 !