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Amethyst
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Amethyst — specimen 0402, photo © NMNHS
Amethyst
—
specimen 0402
Origin
no locality data
Data
Weight:
0.76 ct;
size:
7.04 | 6.02 | 3.81 mm;
shape:
oval;
colour:
medium violetish blue; very slightly greyish;
clarity:
eye clean;
cut:
excellent;
treatment:
none.
Notes
Very clean specimen; design ‘Ovalimixtum ST’ [culet facet added], excellent cut by Tan Pen.
Other specimens
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More information from ‘Classification’
Amethyst
A violet variety of quartz. The colour is caused by iron impurities in the 10s to 100s parts per million range.
Gemmology — gemstones
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