Standard Weight Chart

Standard-Weight-Chart

1. A Richblu round brilliant will generally consist of 58 facets including the culet (the small area at the base of the stone’s pavilion (the lower half below the girdle)). There will be 33 facets on the crown (the top half above the middle or girdle of the stone) and 25 on the pavilion. The girdle may be frosted, smoothly polished, or faceted.

2. To generate the Richblu weight chart an average is taken of 500 pieces of newly produced blue sapphires, pink sapphires, yellow sapphires, orange sapphires, rubies and emeralds.

3. The weight value can vary no more than +/-5% of the applicable weight.

SHAPE SIZE BLUE SAPPHIRE RUBY

Round Normal Cut

round-normal-cut

3 0.1504 0.1504
3.5 0.2348 0.2348
4 0.3687 0.3687
4.5 0.5212 0.5212
5 0.6839 0.6839
6 1.201 1.201

Round Diamond Cut

round-diamond-cut

1 0.0062 0.0062
1.25 0.0103 0.0103
1.5 0.0185 0.0185
1.75 0.0278 0.0278
2 0.0422 0.0422
2.25 0.0567 0.0567
2.5 0.0731 0.0731
2.75 0.103 0.103
3 0.136 0.136
3.5 0.2039 0.2039
4 0.308 0.308
4.5 0.4429 0.4429
5 0.5737 0.5737
6 1.0001 1.0001

Square Normal Cut

square-normal-cut

3 0.1988 0.1988
3.5 0.3142 0.3142
4 0.4584 0.4584
4.5 0.6448 0.6448
5 0.8549 0.8549
6 1.4183 1.4183

Square Princess Cut

square-princess-cut

2 0.0515 0.0515
2.5 0.1061 0.1061
3 0.1679 0.1679
3.5 0.2822 0.2822
4 0.3966 0.3966
4.5 0.5614 0.5614
5 0.754 0.754
6 1.3472 1.3472

Oval

oval

4×3 0.207 0.207
5х3 0.2781 0.2781
5х4 0.4707 0.4707
6х4 0.5984 0.5984
6×5 0.8271 0.8271
7х5 1.0691 1.0691
8х6 1.7592 1.7592
9х7 2.5081 2.5081
10×8 3.5247 3.5247

Pear

pear

4×3 0.1936 0.1936
5×3 0.2441 0.2441
5×4 0.4202 0.4202
6х4 0.5026 0.5026
6×5 0.7529 0.7529
7х5 0.8734 0.8734
8х6 1.4554 1.4554
9×7 2.1867 2.1867
10×8 2.9819 2.9819

Marquise

marquise

4×2 0.0917 0.0917
5×2.5 0.172 0.172
6×3 0.2894 0.2894
7×3.5 0.4594 0.4594
8×4 0.6602 0.6602
10×5 1.339 1.339