I thought I'd share a glimpse of my collection of tiny rings but please know that these really are 'just for fun'. They are very narrow (2mm wide) and David does not recommend a ring this narrow for regular wear.
David has made about 10 of these very narrow rings for me! I wear them in stacks of three and I just love to mix and match them. Depending on which 3 I wear, they can look like a solid ring when worn.
I especially like to use two black wood rings as borders for a center ring of koa or blue spruce or juniper heartwood. Some of these tiny stacking rings are lined, some are one solid wood. These have all seen lots of wear :)