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Oval Help - Is girdle thickness important?


PNWgolfer24
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I’m so confused on how much Girdle size really matters in diamond quality, specifically in Ovals. I’ve been looking at a 1.2ct compared to a 1.51ct. The 1.2 has a medium to thick girtle rating versus the 1.51 has very thick to extremely thick rating. I was all set to move forward with the 1.51 as everything else about it the stone seems great, and I was willing to pay the extra $1800 to hit that larger 1.5 mark, but now I’m second guessing as I hadn’t considered girdle at all until it recently popped up in a few searches.

 

Here are the other specs:

1.2ct is 8.19 x 5.96 x 3.75 - 1.37ratio - F VS2 with 63% table and 63% depth

1.51ct is 8.37 x 6.32 x 4.20 - 1.32ratio - F SI1 with 56% table and 66.5% depth

Is the extra girdle thickness of the 1.51 a bad thing? Does the 1.2 appear close to the same size because it’s not hiding the weight in the thickness like the 1.51? Would love any feedback or help on this. 
 

video comparison (1.51 on bottom)

quicktime

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Hi PNWgolfer24, welcome to Diamond Review!

To your questions, in reverse order (from most specific to most general):

7 hours ago, PNWgolfer24 said:

Does the 1.2 appear close to the same size because it’s not hiding the weight in the thickness like the 1.51?

Yes. And the 1.51 is 'discounted' within the 1.50s because of that (or, if you prefer, the 1.20 goes for a relative premium within the 1.20s).

7 hours ago, PNWgolfer24 said:

Is the extra girdle thickness of the 1.51 a bad thing?

It's not 'bad' other than making the stone look smaller than a well proportioned 1.50 ct oval, while making you pay a premium for the fact that it hits a weight threshold.

7 hours ago, PNWgolfer24 said:

I'm so confused on how much Girdle size really matters in diamond quality

It matters because of the weight-to-apparent-size ratio. Ignoring that, optically, unless you have a fairly uncommon set of proportions, it makes no difference, particularly in modern cut stones with a faceted girdle.

The 'problem' is that diamond pricing is proportional to weight, but the price/carat has big jumps at certain weight thresholds (which include every 1/2 carat), so there is a big temptation for a cutter to preserve weight at the expense of other desirable characteristics. FWIW, from a 7 seconds video, the 1.51 does look nicer, but would I spend several $1,000 on the basis of a 7 seconds video? Nope.

Also, if you are paying for someone calling the diamonds F and VS2/SI1, make sure that you can trust that opinion. Do the diamonds come with lab reports? Are the labs reliable? If the answer to either question is 'no', you have bigger issues than girdle thickness.

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Thank you David that is extremely helpful. Both diamonds are GIA certified, so all good on that front. I will try to add the reports, but both stones got excellent polish, and the 1.51 got excellent symmetry, the 1.2 was very good  

 

FWIW these would be going into a 3stone ring with pear sides (~.48ct total weight).
I was quoted 12,900 for the 1.2 center and 14,750 for the 1.51. Seems a little on the high side, but it’s from a small local boutique jeweler, where if the ring needs to be remade in another color metal, designs changed etc they do it free of charge. Nice to have that peace of mind as I have a really good idea what my GF wants, but this offers flexibility.

 

Here’s one video of the 1.51 by itself in natural light: https://youtube.com/shorts/7HLtiVsfLsY?feature=share

Here’s on more comparing the two under shop lights: https://youtube.com/shorts/ZBxchlljIPg?feature=share

Seems like for $1700 more it’s not too bad to upgrade to the 1.51 as everything outside of girdle size is looking good. I guess I’m just torn on if I should keep looking for something that ‘shows it’s weight’ a little more. 

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20 hours ago, PNWgolfer24 said:

I guess I’m just torn on if I should keep looking for something that ‘shows it’s weight’ a little more. 

I think the problem may be to find more 1.50 ovals in your chosen jeweller's inventory... there are a lot of upsides in using a small local boutique, but there are also downsides. Would they be prepared to call in a couple more stones to show you? If so, and time isn't pressing, I would ask them to do that - then you can make a more informed decision. BTW - be prepared for a better cut 1.50 to be more expensive - but also consider the proportions with the side stones and your GF's finger/hand.

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