If my memory serves me right, there is once I saw a diamond that has triple grading report - GCAL, GIA, and AGS. GCAL actually gives a lower grade than the two others. While this does not mean anything statistically, but in that instance, we can say GCAL is as strict as the other 2 labs, if not stricter. Decagon is sold by Jann Paul and it is exclusive to them alone, and as far as I know, Paul design this diamond shape and he sets strict standards, from the design of the diamond to the raw material of the diamond, including lab grown material.

The decagon will scintillate better than typical round because of the extra facets of the diamond. The price is definitely not cheap for a lab-grown diamond, but then again, this is exclusive to Jann Paul alone. To give you a comparison, you can probably get yourself a 1 carat D VVS1 with 18k white gold band between 6k - 8k, depending on where you get it from.

As for specs, this is considered a fancy cut, therefore, we probably can't use typical round brilliant standard for this diamond shape. However, you can get more info from the Hearts and Arrows, ASET and IdealScope image from Jann Paul, which they will provide by default standard.

As long as it is a Jann Paul production, personally, I won't have any hesitation to get anything from them. I have no affiliate relationship with them, but personally, I just enjoy what they have been doing, and most importantly, they are creating some great cuts below 1 carat, which allows a wider range of consumers to access some great diamonds without breaking the bank.

You can read about my own decagon experience here: https://www.myengagementringexperience.com/...ite-series.html

My one is a natural diamond graded by AGS (before they merge with GIA).