The Hope Diamond by Jack Rowland
Replica of the Hope Diamond
Angles worked out on GemCad by Jack Rowland
Based on cut published by Tom R, Barbour C.G.
Angles for R.I. = 1.54 58 facets + 16 facets on girdle = 74
2-fold, mirror-image symmetry 64 index
L/W = 1.087 T/W = 0.689 T/L = 0.634 P/W = 0.462 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.661 P/H = 0.699 C/H = 0.271
Vol./W^3 = 0.279
Pavilion
1 44.00 64-32 cut to center edge
2 41.60 16-48 cut to center meet point
3 90.00 01-31-33-63 cut just until girdle facets meet
4 90.00 15-17-47-49 cut just until girdle facets meet
5 41.00 08-24-40-56 cut to center point meet
6 45.00 01-31-33-63 cut to 1-3 meet
7 42.50 15-17-47-49 cut to 2-4 meet
8 43.00 06-26-38-58 cut to 1-5-6 meet
9 90.00 06-26-38-58 level girdle
10 42.20 10-22-42-54 cut to 8-5-9 & 5-7-2 meets
11 90.00 10-22-42-54 level girdle
00.00 Culet cut culet facet
Crown
1 42.00 64-32 leave some girdle
2 47.00 01-31-33-63 cut just to girdle -1 meets
3 42.00 16-48 cut to same girdle width as 1
4 42.00 08-24-40-56 cut to same girdle width as 1 & 3
5 27.00 02-30-34-62 cut to 1-2-4 meets
6 0.00 Table cut now to help place other facets
7 23.00 12.5-19.5-44.5-51.5 cheat index to table meets
8 48.30 06-26-38-58 level girdle & make 2-4-5-1 meet
9 47.39 10-22-42-54 level girdle & make 4-3-7 meet
10 45.86 15-17-47-49 level girdle & make 3-4-7-9 meet
Start with rectangular preform 25X23 mm

The Hope Diamond Replica design file is available for GemCad users.

   
Hope Diamond image courtesy the Smithsonian   
This cut is not one I designed, but I did work out the cutting angles and index settings using GemCad. This is part of an on going project started by Reivan Zeleznik to work out accurate cutting patterns for the Great Diamonds. This is not an exact replica as the angles are set for quartz, not diamond and the girdle is flat vs. rounded. If you want to duplicate the beautiful blue you will need to get a deep blue CZ large enough. You can get some from Creative Gems. Call (972) 287-3445 or fax (972) 287-4965 to get a catalog. They sell rough pre-cut for replicas of the Great Diamonds in both size and color. He also has reprints for other of the Great Diamonds, but be warned! Most of the cutting directions do not prove out on GemCad.

This is a little challenging at the crown 1, 3, and 4 facets in that you must cut them to the exact same girdle thickness without a meet point reference. All the rest of the cuts are meet point. Also be aware that I have not yet cut this pattern, but all the gems I've done on GemCad so far cut on the computer just like they do on the lap.

The Hope Diamond is now owned by the Smithsonian Institution in Washington D.C. It is the only gem on display there during renovation of the Gem & Mineral facilities. The diamond's history is not completely known. It is thought to have started off as the Blue Taverneir, mined in the Kollur diamond mines near Golconda. It was purchased by Taverneir in 1642 and was sold to Louis the XIV in 1668. At that time it weighed 67 carats after cutting. During the French Revolution it was lost, but in 1830 a diamond of similar size and color came on the London market. It was bought by Mr. Hope where it got the current name. If it is the same diamond it had been recut. The diamond changed hands several times there after from Abdul Hamid, Sultan of Turkey in 1908, to Mrs. Edward McLean in 1911, to Mr. Harry Winston in 1949. He, in turn, donated it to the Smithsonian.

The Hope Diamond Weighs 44.5 carats and measures about 25X23 mm. It is believed the original rough, from which the Taverneir was cut weighed 112.25 carats. Believe it or not this is a pretty good yield when it comes to gem cutting.

Historical details from "A Treasury of Jewels and Gems" by Mona Curban.


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