Amethyst — specimen 0249, photo © NMNHS
Weight: 32.00 ct; size: 25.25 | 19.25 | 14.20 mm; shape: oval; colour: light bluish violet; very slightly greyish; clarity: eye clean; cut: very good; treatment: none.
Very clean specimen; design ‘Beginner Barion Oval a.k.a. Quake311’ by Michiko Huynh, very good cut by Tan Pen.
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.