Use the grading obtained
for each factor and weigh them according to the previous
text. For example, if the grades obtained were: Color-8,
Shape-7, Lustre-8, Nacre-8, Blemishes-6, and Matching-6,
then the grading system would weigh them as follows:
| Color |
8 x .10 = |
.80 |
| Shape |
7 x .15 = |
1.05 |
| Lustre |
8 x .25 = |
2.00 |
| Nacre |
8 x .25 = |
2.00 |
| Blemishes |
6 x .20 = |
1.20 |
| Matching |
8 x .05 = |
.40 |
Total
grade =
|
7.45 |
Important Notes:
- If the lustre is high but the nacre is
thin, the final grade should be adjusted
lower as these pearls will often look
better than they are. After a short
period of time, the lustre will diminish
due to the lack of nacre thickness.
- Conversely, if the nacre is very thick,
but the lustre is low, the final grade
may need to be adjusted up. This is
especially true if grading pearls that
have oxidized over time and are showing
some wear. Nacre thickness is so
important to pricing in Japan that
replacement for the thicker nacre strands
must be considered.
- Remember to consider the size range of
the pearls. A 6x61/2 mm strand that is
mostly 6mm should cost less than a strand
that is mostly 6 ½.
- The final grade is only a guide and you
should be willing to adjust when
necessary based on experience or other
grading factors.
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