This ring is made from a very white quartz-like stone, as could be seen if you could view the interior from fresh break.
First mishap: It was once intact, but broke within the last year when my
cat jumped onto an almost always cleared surface of a chest to look out of the window. A box containing many interesting pieces was upset and fell to the floor. This ring was one of the casualties - see photo. When
pieces are placed together, one can hardly see the break line. (A perhaps
more serious casualty was the breaking of two out of three long Chinese
rock crystal cylinder beads which are identified in the timeline as Liao, but which I have also seen identified as Warring States by a different source. Unfortunately the third cylinder was slightly chipped at one end. This could be a topic for a thread: bead accidents - it could be cautionary and a source of consolation at the same time.)

Second mishap: I was certain that I had seen an almost identical piece in one of the books on South East Asian stone art recommended by Sallie, but now that I have looked there and elsewhere, I cannot find it and I wonder if I imagined it.