Recut - Calculating the loss

[AV_]

Digressing,

...
Kozibe optical effects have as much weight in the appeal of a diamond
...

I feel that the Kozibe effect & the H&A are methods in the same spirit - read a pattern signifying brilliance, are they not?

 

[prs]

@prs You write that looking back it looks really good in the picture. After all your research would you still be comfortable buying such a shallow oec?

Most OECc are very deep relative to a well cut MRB. The cut charts would give all these deep OECs very poor grades!! So if you find a shallow OEC that you love and it looks great, why not buy it? The light return couldn't be any worse than the deep OECs.

The price of that particular stone was well over our budget otherwise it would likely be ours already! DW did have reservations about the setting, she would have preferred something a bit less complicated.

If I were thinking of re-cutting an MRB I would first decide what would be the largest %table I could live with. Then I would figure out what CA would allow me to achieve that table whilst keeping the same spread. PA would stay the same, so I would then know my CA, PA combination, and I would ask a cut guru, such as @Karl_K to comment on that combination.

If comments were not too negative I would then figure out what %LGF I would want to go with that %Table to give my desired facet pattern. Shortening the LGFs would loose almost no weight and I would have those re-cut first to see what it looked like. This would be my "sneaking up on it" approach.

 

[xxxxxx]

@prs thank you for sharing your experience. Do you remember if the diamond had obstruction issues? Like the girdle reflecting in the middle of the diamond when tilted?

Is there a deadline on your diamond project? Are you actively looking or still researching?

 

[prs]

We looked at the diamond back in February and I now realize I didn't know nearly enough about OECs to be a good judge. I don't think I'd ever even heard of obstruction, so for sure I didn't look for it. Grace has six videos of the stone on her site so best to look at those for clues. Let me just say I know from the PS Diamond Search you can buy a 6 carat L,SI1 MRB for around $55K. This stone is drop dead gorgeous, and OECs this size are extremely rare, so it definitely merits a premium, however I would hope there is room for negotiation in the asking price.

Our 40th is still a year away so that would be the ultimate deadline.We are still looking but in no great hurry because of the uncertainty in the economy. I have no idea where diamond prices might be six months from now, but I doubt they will be any higher.

Still researching but have had a couple of unrelated projects come up that are taking up all my free time. Should be able to get back to it in about a month.

 

[ariel144]

What a great thread! Have to put on my thinking cap and read again for better detailed comprehension. There are several threads where ppl recut MRB into OEC's with great success. I will say this, which I did not see covered here....according to Jonathan at www.distinctivegem.com, to get a good recut the pavilion angle on your MRB should be no less than 41 degrees. Check out his AVR's and they all have 41+ degree pavilion angles. Although I've seen Victor Cannera OEC's that had 40.+ degree angles. So what did you decide to do?

Personally, I prefer the larger table OEC's (52-55%) where the flower pattern can be better seen.

 

[TXwidow]

someone might have already asked this: Current stone: Depth: 61.2%
Desired depth in recut: Depth: 63%

How does one go about getting a deeper depth? I.e., 63 when the stone is 61.2?

 

[lulu_ma]

someone might have already asked this: Current stone: Depth: 61.2%
Desired depth in recut: Depth: 63%

How does one go about getting a deeper depth? I.e., 63 when the stone is 61.2?

It’s mathematical. If you reduce the diameter of the stone enough, you can get to 63% depth.