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PACOR - Advanced Computer technologies for Processing of Rough diamonds
Laser Mapping of Concavities
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Technology patent "A method and apparatus for locating inclusions in a diamond stone"
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"Askor" - Report on the tests of the interactive computer diamond marking system (ICDMS)

Objectives

Approbation and Estimation of efficiency of the interactive computer diamond marking system (ICDMS).

Stones having inclusions that make efficient marking complicated and considered non-profitable with the existing visual marking technology and control lots.

Control lots
Stones Spec 2col 3ct 3pcs 9.07 ct
Stones Dark 2col 4ct 2 pcs 8.47 ct
Cleavage Spec 1col 3ct 3 pcs 9.73 ct
Experimental lots
Stones Spec 2col 3ct 3pcs 9.74 ct
Stones Dark 2col 4ct 3 pcs 12.41 ct
Cleavage Spec 1col 3ct 3 pcs 10.04 ct

The selected stones were of comparatively complicated shape (with various degrees of distortion). The inclusions were located both in peripheral and central zones. The "Cleavage" experimental group contained stones suitable for inscribing a large "Cr-57" diamond. The "Spec Stones" and "Dark Stones" groups consisted of stones similar with respect to both shape and inclusion location.

Work procedure

Mikhail Shcherbakov, an "Askor" expert, marked every stone of the experimental group and predicated the results with the help of traditional technology (mass, color group, quality group, linear parameters were determined). Then the prediction of the characteristics was made with the help of ICDMS, based on the expertís marking. The optimal location of diamonds was determined with respect to their cost and considering the risk of possible loss. The marked stones were processed on the cutting production of "Askor" in accordance with the existed technology ("sawing"-"bruting"-"cutting"). In addition to the experimental lot, without the preliminary marking, a diamond of the following characteristics was marked with the help of ICDMS: Dark Stones 2col 4ct 4.78 ct.

1. Control lots
N Mass Value
$ USA
Shape Mass Russian
Grading system
GIA Yield Price Value
$ USA
Value
$ USA
Efficiency
Spec Stones, 2Col , 3ct 1256 = 3pcs ,9.07 ct
1 2.94 3692.64 Cr-57
Cr-57
1.09 5/5 (-5%) G/VS2 48.3% 3135 3417.15 3991.35 1.08
0.33 6/3 H/VVS2 1740 574.20
2 2.92 3667.52 Cr-57
F.Prin
1.08 3/5 E/VS1 51.4% 3900 4212.00 4481.78 1.22
0.42 2/8(-30%) E/12 658 269.78
3 3.21 4031.76 Cr-57
Cr-57
1.17 6/5 H/VS1 45.5% 3050 3568.50 3820.80 0.95
0.29 3/5 G/VS2 870 252.30
9.07 11391.92 4.38 48.3% 12293.93 1.08
Dark Stones, 2Col , 4ct 1303= 2pcs ,8.47 ct
4 4.09 5329.27 Cr-57 1.57 5/6 G/VS2 47.7% 3600 5652.00 6093.56 1.14
F.Prin 0.38 3/6(-30%) F/VS2 1162 441.56
5 3.84 5707.14 Cr-57 1.21 4/7 F/SI1 44.7% 3350 5393.50 5606.65 0.98
F.Prin 0.61 3/8(-30%) E/I2 609 213.15
8.47 11036.41 3.91 46.2% 2992 11700.21 1.06
Spec Cleavage, 1Col , 3ct 1054= 3pcs ,9.73 ct
7 3.13 3299.02 Cr-57 1.18 6/4 H/VS1 46.5% 3250 3835.00 3774.35 1.18
F.Trian 0.14 4/6(-15%) H/I2 434.75 63.67
8 2.86 3014.44 F.Prin 1.05 5/5(30%) G/VS1 54.3% 2310 2425.50 4869.77 0.92
Cr-57 0.27 3/3 G/VS1 1335 360.45
9 3.74 3941.96 F.Prin 1.21 3/7(30%) F/SI1 44.4% 2100 2541.00 4272.00 0.80
F.prin 0.34 3/3(30%) E/VVS2 1806 614.04
9.73 10255.42 4.19 43.1% 9839.66 0.96
8pcs
27.27
32683.75 16pcs
12.48
45.8% 2711 33833.8 1.04
 

2. Experimental lots

N Mass Value
$ USA
Shape Mass Russian
Grading system
GIA Yield Price Value
$ USA
Value
$ USA
Efficiency
Spec Stones, 2Col , 3ct 1256= 3pcs ,9.74 ct
1 3.00 3768.00 Cr-57 1.09 6/4(-5%) H/VS1 53.7% 3087.5 3365.38 4388.22 1.16
F.Prim 0.52 4/4(-30%) G/VS1 1967 1022.84
2 3.03 3806.68 Cr-57 1.14 4/4 F/VS1 49.8% 3800 4332 4861.11 1.28
Cr-57 0.37 6/5* H/VS1 1430 529.10
3 3.71 4659.76 Cr-57 1.53 4/6 F/VS2 53.9% 3900 5967 6766 1.45
Cr-57 0.47 4/6 F/VS2 1700 799
9.74 12233.74 5.12 52.6% 3128 16015.33 1.31
*- yellow spot
Dark Stones, 2Col, 4ct 1303= 3pcs ,12.41 ct
4 4.31 5615.93 Cr-57 1.75 5/7 G/SI1 53.1% 3210 5617.50 6913.50 1.23
Cr-57 0.54 5/5 G/VS1 2400 1296.00
5 3.84 5003.52 Cr-57 1.21 7/3 I/VVS2 47.4% 3150 3811.50 4845.45 0.97
F.6cnr 0.61 6/3(-30%) H/VVS2 1695 1033.95
6 4.26 5550.78 Cr-57 1.44 3/5 F/VS1 50% 3900 5616.00 7272.00 1.31
Cr-57 0.69 5/5 G/VS1 2400 1656.00
12.41 16170.23 6.24 50.3% 19030.95 1.18
Dark Stones, 2Col, 4ct 4.78 ct.
7 4.78 6228.34 Cr-57 2.26 5/5(-5%) G/VS1 53.6% 4750 10735.00 11008.00 1.76
Cr-57 0.30 5/5 H/SI2 510 273.00
Spec Cleavage, 1Col , 3ct 1054= 3pcs ,10.04 ct
8 3.12 3288.48 Cr-57 1.26 4/7 F/SI1 46.5% 2850 3591.00 3774.35 1.15
F.7cnr 0.19 2/3(-20%) E/VVS2 965 183.35
9 3.22 3393.88 Cr-57 1.28 5/6 G/VS2 54.3% 3000 3840.00 4869.77 1.43
F.Trap 0.47 3/2(-30%) F/VVS1 2191 1029.77
10 3.70 3899.80 Cr-57 1.12 5/7 G/SI1 44.4% 2700 3024.00 4272.00 1.10
Cr-57 0.52 5/5 G/VS1 2400 1248.00
10.04 10582.16 4.84 50.7% 12916.12 1.22
10pcs
36.97 ct
45214.17 20pcs
18.76 ct
50.7% 3143 58970.4 1.3

These tables demonstrate:

  1. The output is approximately 5% higher in all the experimental groups compared to the corresponding control groups.
  2. The efficiency ratio of the processing has increased by 10%.
  3. For brilliants that were cut from groups of "Spec Stones" and "Dark Stones" the improvement clarity of polished diamonds (on the average on 1 position) was received, that is shown in a trace to the table.

Experimental Test
Big Diamond Small Diamond Big Diamond Small Diamond
Spec stones
4.67 5.00 5.00 5.33
Dark stones
5.00 5.25 6.50 7.00

More correct and precise efficiency coefficients values could be obtained from the table below.

* There were no prognoses on diamond color and the result after cutting was used in diamond valuation.

N The diamond parameters were chosen according to "Askor" factory requirements The prognoses was tested by PaCor system The diamond parameters were chosen according to PaCor system   requirements Diamond parameters after cutting according to PaCor recommendations
Quality Mass Price Quality Mass Price Quality Mass Price Quality Mass Price
Spec Stones, 2Col, 3ct 1256= 3pcs ,9.74 ct
N Mass Cost
1 3.00 3768
2 3.03 3806
3 3.71 4660
12234
1 6/6 1,00 2750 6/6 1,06 2915 6/4 1,01 3282 6/4 1,09 3365
4/2 0,30 759 4/2 0,31 784 4/2(15%) 0.48 1187 4/4(30%) 0,52 1023
2 4/4 1,00 3800 4/4 1 3800 4/4 1,02 3876 4/4 1,14 4332
6/5 0,35 501 6/5 0,35 501 6/5 0,38 543 6/5 0,37 529
3 4/6 1,50 5850 4/6 1,46 4818 4/6 1,54 6006 4/6 1,53 5967
4/4 0,43 1097 4/4 0,42 1071 4/4 0,42 1071 4/6 0,47 799
Total Cost 14757,00 13889 15965 16015
Efficiency 1,206 1,135 1,305 1,309
Dark Stones, 2Col, 4ct 1303= 3pcs ,12.41 ct
N Mass Cost
4 4.31 5616
5 3.84 5004
6 4.26 5551
16171
4 5/7 1,60 5040 5/7 1,60 5040 5/7 1,67 5261 5/7 1,75 5618
5/7a 0,53 848 5/7 0,53 1039 5/3 0,51 1403 5/5 0,54 1296
5 7/6 1,38 3588 7/6 1,4 3640 7/2 1,27 4128 7/3 1,21 3812
6/2 0,30 567 6/2 0,41 890 6/2 0.58 1462 6/3 0,61 1034
6 3/4 1,50 7725 3/7a 1,5 4650 3/4 1,5 7725 3/5 1,44 5616
5/5 0,64 1536 5/5 0,67 1608 5/5 0,68 1632 5/5 0,68 1656
Total Cost 19304,00 16867 21611 19032
Efficiency 1,194 1,043 1,336 1,177
Dark Stones, 2Col, 4ct 4.78 ct.
N Mass Cost
7 4.78 6228
6228
7 5/4 2,08 11232 5/5(5%) 2,26 10735
5/4 0,3 570 6/7a 0,3 273
Total Cost 11802 11008
Efficiency 1,894 1,768
Spec Cleavage, 1Col, 3ct 1054= 3pcs ,10.04 ct
N Mass Cost
8 3.12 3288
9 3.22 3394
10 3.70 3900
10582
8 4/7 1,00 2850 4/7 1,00 2850 4/7 1,11 3164 4/7 1,26 3591
2/4 Flat F. 183 2/4 Flat F. 183 2/4 Flat F. 183 2/3(20%) 0,19 183
9 5/6 1,00 3000 5/6 1 3000 5/6 1,19 3570 5/6 1,28 3840
3/2(30% 0,30 876 3/2(30%) 0,30 876 3/2(30%) 0,55 1359 3/2(30%) 0,47 1030
10 5/7 1,00 2700 5/7 1,00 2700 5/5 1,06 3498 5/7 1,12 3024
5/5 0,80 2016 5/5 0,80 2016 5/5 0,53 1276 5/5 0,52 1248
Total Cost 11625,00 11625 13050 12916
Efficiency 1,099 1,099 1,233 1,221

Due to imperfection of the "Askor" equipment and resulting mistakes in the phases of sawing and stripping, the clarity group and mass characteristics of the diamonds deteriorated, which resulted in diminishing of efficiency ratio on the following stones:

  1. There were mistakes during sawing diamonds # 1 and # 6;
  2. During cutting of ## 3,4,9 - the defects were not cut off;
  3. In diamond # 7 - the defects were not cut off because of incorrect bruting.
Head of division of "OctoNus" company Main technologist of "Askor" factory
S.B.Sivovolenko M.O.Sherbakov