Wish people would stop using the term "bitcoins" as if they're singular metal entities, it seems to be where the perception that they are "too expensive" comes from.
Bitcoin. Divisible to 8 decimal places.
Bitcoin. Divisible to 8 decimal places.
That said, semantically, coins aren't usually thought of as divisible things in a modern context-- they are pluralized, so bitcoin will probably be pluralized in the same way.
in case of gold it is in "kilograms" - still plural, even though it is divisible.