Last update 3 Sept. '01
Last update 3 Sept. '01
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Gem- |
F++/G F++ |
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Good |
| General description | Perfect and outstanding | Perfect, even under low magnification | 1 to 2 minor natural blemishes hard to find | More than 2 minor natural blemishes hard to find
or 1 to 2 more noticeable natural blemishes |
A few quite visible blemishes
or 1 significant blemish |
Many quite visible blemishes
or 1 to 2 significant blemishes |
Badly damaged and/or dead on beach |
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Additional remarks
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Any of the natural blemishes in no way detracts from
the look of the shell.
Most gem specimens fall into this category when more carefully inspected |
In any case, the natural blemishes do not detract significantly from the look of the shell | It's better than an F graded specimen in that it's still good for an aestetically pleasant collection | Usually, considered suitable only as space filler or for a study pourpose | Not interesting for a collecting pourpose but still good for a scientific testing | ||
| Possible Natural Blemishes: | |||||||
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Collected
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Alive | Alive | Alive or looks alive | Could be very fresh dead | Could be fresh dead | Could be dead | Could be dead on beach |
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Stage of development
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Fully adult | Fully adult | Fully Adult | Could be slightly SubAdult | Could be SubAdult | Could be sligtly Juvenile | Could be sligtly Juvenile |
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Pattern
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Fully representative | Fully representative | Good representative | Good representative | Sufficiently representative | Scarsely representative | Insufficiently representative |
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Irregular growth of the dorsum
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Not allowed | Not allowed | Slight | Quite visible | Well visible | Strong | Strong |
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Growth
lines
& flaws
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Not allowed | Not allowed | Faint, hardly visible and well nacred over | light, soft and/or short | Could be present but mostly sideways | Could be present | Could be present |
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"Bubbles" in nacre
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Not allowed | Not allowed | very few and hardly visible | A few and scarcely visible | A few but more noticeable | Noticeable | Many and noticeable |
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"Hairlike cracks" in nacre
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Not allowed | Not allowed | very few and hardly visible | A few and scarcely visible | Noticeable | Strong | Strong |
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Inclusions
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Not allowed | Not allowed | Very few, tiny, hardly visible and well nacred over | A few and scarcely visible | Could be present | Could be present | Could be present |
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Healed scar
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Not allowed | Not allowed | Tiny, hardly visible and well nacred over | small and sideways | Could be present but sideways | Could be present | Could be present |
| Possible Caused Blemishes: | |||||||
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Chips
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Not allowed | Not allowed | Not allowed | Not allowed | Hardly visible | Visible | Visible |
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Scar
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Not allowed | Not allowed | Not allowed | Hardly visible | Could be present but sideways | Could be present | Could be present |
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Holes
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Not allowed | Not allowed | Not allowed | Not allowed | Hardly visible | Visible | Visible |
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Scratches
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Not allowed | Not allowed | Hardly visible | Slightly visible | Visible | Visible | Deep |
