Anyone heard of Circular Brilliant Cut? Is it OEC?

[Kyclaire]

Hi All,

I am recently in the market for an OEC engagement ring, and chanced upon this beautiful diamond. After looking at the GIA certificate earlier, I realized that GIA has termed the diamond a "Circular Brilliant" instead of an OEC. Does anyone knows what this mean, and if this makes the diamond less valuable?

Thank you.

 

[bludiva]

Gia doesn't use the term oec / old european cut. I think as these became more popular they came uo with circular brilliant so these would not be judged by the same standard as round brilliants. I don't think it makes the diamond less valuable necessarily but oecs do seem to be priced differently than their modern counterparts

 

[tyty333]

I'm pretty sure GIA does use the designation of Old European Cut. I have seen a few stones/GIA reports. There are specific requirements
that a stone must have to get the OEC designation. If a stone does not meet them (or the round brilliant definition), it gets the circular brilliant designation.

It would not make a stone less valuable IMO.

 

[bludiva]

I'm pretty sure GIA does use the designation of Old European Cut. I have seen a few stones/GIA reports. There are specific requirements
that a stone must have to get the OEC designation. If a stone does not meet them (or the round brilliant definition), it gets the circular brilliant designation.

It would not make a stone less valuable IMO.

My bad....here is the explanation in more detail. Thanks, @tyty333 !

https://www.gia.edu/gia-news-research-round-brilliant-cut-diamond-pay

Initially, GIA allowed only one exception—the old European cut—into its cut-grading system. This accommodated the distinctive proportions of diamonds cut in this classic style. Its appearance is associated with a time that predates expectations of conformity with the appearance of the modern-day round brilliant. As a result, GIA does not apply a cut grade to diamonds cut in the old European style.

GIA identifies classic old European cuts using these criteria:

• Table size: less than or equal to 53 percent
• Crown angle: greater than or equal to 40 degrees
• Lower half facet length: less than or equal to 60 percent
• Culet size: slightly large or larger

 

[the_mother_thing]

Yes, GIA specifies OECs if - as tyty noted - it meets their requirements for the cut (though I’m not sure it’s known what specifically those parameters are).

ETA: I see @bludiva found/posted the GIA OEC/OEB criteria above; helpful to know! Thx!

My OEC’s GIA report:


If I were considering an OEC, I wouldn’t worry nor ‘mentally devalue’ the diamond if the lab report doesn’t specifically say “OEC/OEB”, as there are variations that still broadly fall into that category, in my opinion. Considering how/when some of these were cut (e.g. 100+ years ago, by hand in candlelight, etc) I don’t think it’s fair to expect them all to fit entirely into a narrow, modern-day set of criteria. Just my two cents.

Tagging @oldminer to see if he might be able to shed some light on the topic as well.

 

[Dreamer_D]