aljdewey
Ideal_Rock
- Joined
- Nov 25, 2002
- Messages
- 9,170
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On 6/11/2004 11:20:57 AM searcher wrote:
That's not true. Grading results from the reputable labs are repeatable within a grade or two almost all the time. There is extensive formal training involved in becoming a grader.----------------
On 6/11/2004 8:59:12 AM valeria101 wrote:
Clarity grading is not a science, unless the definition changed yesterday. Garding results are not repeatable...![]()
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I think the point Val was trying to make is that grading is a *subjective* science.....meaning it's based on an individual's interpretation. My stone is a perfect example.....it's graded SI2, but four other trained and extremely qualified people have commented it should have been an SI1.
Yes, there is training involved in becoming a grader, but the performance of grading relies on *individual* judgment calls....that's not quite a science, and that's the point Val was making. Something inherently repeatable is 2+2=4. That will always produce the same result. Not so with clarity grading.
One final thought....you say "Grading results from the reputable labs are repeatable within a grade or two almost all the time". Within a grade or two????? That's hardly narrowing the field. Within a grade or two UP or DOWN from a G, VS2 means a stone could be an E, F, G, H, or I stone with VVS2, VS1, VS2, SI1, or SI2 by your definition. I'm sure you're aware of what a HUGE price swing it is in that range. To me, that doesn't qualify as definitive.