Gemmology
English | Български
Where am I? > Home > Repository > Amethyst


Gallery view selector

Colour selector
Simple colour schemeredorangey redreddish orangeorangeorangey yellowyellowgreenish yellowyellowish greenslightly yellowish greengreenvery slightly bluish greenbluish greenvery strongly bluish greengreen-blue or blue-greenvery strongly greenish bluevery slightly greenish bluebluevioletish bluebluish violetvioletbluish purplepurplereddish purplestrongly purplish redslightly purplish redcolourlessgreyblack
Amethyst — specimen 0232, photo © NMNHS
Amethyst — specimen 0232, photo © NMNHS

Amethystspecimen 0232

Origin

no locality data
Data

Weight: 3.56 ct; size: 11.53 | 7.78 | 6.62 mm; shape: octagon; colour: medium dark violetish blue; strong; clarity: eye clean; cut: excellent; treatment: none.
Notes

Very clean specimen; angles [skipping after 45 in the crown] as in ‘Opposing Corners 15’ by Robert H. Long, excellent cut by Tan Pen.

Other specimens
Amethyst — specimen 0675Amethyst — specimen 0676Amethyst — specimen 0678Amethyst — specimen 0679Amethyst — specimen 0681Amethyst — specimen 0703Amethyst — specimen 0706Amethyst — specimen 0467Amethyst — specimen 0753Amethyst — specimen 0085Amethyst — specimen 0612Amethyst — specimen 0344Amethyst — specimen 0402Amethyst — specimen 0224Amethyst — specimen 0368Amethyst — specimen 0091Amethyst — specimen 0193Amethyst — specimen 0199

More information from ‘Classification’


A violet variety of quartz. The colour is caused by iron impurities in the 10s to 100s parts per million range.