Actual width dimension of these donuts varies between 18-21mm, Small sample shown in Rhodonite, click on 'More details' for a picture of Tiger Iron, Aragonite, Snowflake Obsidian, Unakite and Picture Jasper.
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Smaller gemstone donut bead in a triangle shape is made from either Red or Poppy Jasper. Current stock is slightly larger than the other colors of small triangles at about 21 to 22mm.