This reminded me of Charles Rennie Mackintosh's rose design (and who doesn't love that style of art nouveau?!) It's thin flat metal and lays perfectly against a dark or colored shirt.
This is a beautifully crafted necklace. I love the simplicity of this design. The adjustable length gives it versatility. I find myself reaching for it routinely...I have to remind myself to keep other necklaces in the daily rotation! I will look out for other designs by Jatana.