These are nothing like any Naga/Hill Tribe beads I know.

I would be inclined to guess they may be Asian. But there's not much I can think of to compare them to.

Have you tested their hardness? Could they be horn or some soft material?

JDA.

I used a small metal saw at one of the holes and it is fairly soft, produces a whitish powder. A hot needle produced no penetration at all. The coloring pattern and cracks make me think of some natural substance. This was probably around in the 1970s, so I would not suspect modern trickery.

Please refer to my post from a short time ago, called "Re. Re. Zi Imitation"—where I discuss doing a hardness test.

In the 1970s, the number of Chinese serpentine beads being offered as "jade" was staggering.

Jamey

P.S. The intent of using a hot-needle is not "penetration." It is to apply heat. In testing beads it is easy to insert the point of a heated steel needle into the perforation aperture—whereupon you stroke it against the wall of the perforation. But in any other circumstance, you need not "stab" the item. Use the side of the point, and stroke it across the surface (as carefully as possible).

These are new jade (i.e. serpentine) beads made in China, with a make-up to give them an ancient-ethnic look.
The bumps form actually a typical Liangzhu tao-tieh (?) mask, in the style of these:

The author of the linked blog came the same conclusion. Oriented the right way the beads do have a face or "mask" - see article and photos:

https://baiyu-quietmuse.blogspot.com/2013/12/eyes-of-infinite-reverie.html

Clicking on any photo brings up a gallery of enlargements.

You and Nishedha have greatly improved our bead knowledge today!

Chapeau!

I know the blog author, as she was (formerly) a member of my Yahoo Tibetan Zi Beads Group.

Be forewarned that there are countless imitations and imaginarily-produced Chinese beads that are routinely said to be "jade" (but are not), and said to derive from some ancient Chinese culture (but do not). Some of them take off from actual ancient artifacts (often enough not beads); and some are just made-up.

Ms Tan does not say she is confident that her beads are authentic. As I read it, she just thinks they are interesting beads, and can be related to the culture cited by stylistic similarities.

JDA.

.....thanks for remembering me!

Sallie aka Daffydil

Good to know what these beads are meant to portray, at least. With my background in Chinese coins, I'm too aware that popular motifs of the past are endlessly copied, and made to look old.