Cutting the Famous Jubilee Diamond

Faceting a duplicate of the world's most precisely cut large diamond requires an accurate faceting machine, careful technique and an understanding of crystallography and gemology as well as a bit of the gem's history.

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[jeriwykoff]

The famous Jubilee is a square cushion cut, in 4-fold symmetry, thus with a square octagon table. All standard round brilliants are 4-fold symmetry, too, and feature a square octagon table shape, usually the result of 4-fold cutting.  I haven't read Tillander's book. All faceted gem tables are "apex" which means "the highest point" so I'm not sure of your emphasis reference.

[Blutquell]

0:32 balanced on a what?

[jwul28]

south african origin = a lots of innocent kids killed and mistreated for this. Shame on the diamond industry.

[dragen55]

i have 2ct unheated and uncut diamond fresh from the ground,,, where can i find someone to make them into priincsess cut

[ragemanchoo82]

Also, the real Jubilee has a normal table. The confusion arises from the Jubilee Cut, which was a modified round brilliant being cut in the 1890s-1900s. It has an apex table. Herbert Tillander's "Diamond Cuts in Historic Jewelry - 1381 to 1910" discusses and shows it.

[ragemanchoo82]

Is the replica at the start is one of the glass replicas from a Kassoy Jewelry Supply Co. kit? I have one identical to it. The real Jubilee's outline is a bit different and it has a culet that's very close to 1:1, rather than oblong, and its pavilion mains are sharper, too. Kassoy's replica flat— real gem has better proportions, so its shorter/narrower. The overall outline is very slightly more rounded.

Google Hubert Racketts' replica, its pretty close save for the long sides' outward angle