the finish is presently just a coat of natural stain to block moisture absorption
all of the dark wood on the rim of this bowl is partridgewood --- up close it DOES show a grain pattern; it's not pure black like ebony (the wood itself is dark brown but the finish makes it look black)
NOTE: this bowl has been finished and is now available on my bowl-sale site: www.phinds.com/bowls/
Information on this specific bowl can be seen at: n033