Choose a stem with 2 branches facing one another. On the photo, it's pruning waste from some viburnum. If it’s green wood, wait until it dries at least a little.

Flatten the front side and the back side, holding the stem.

Then, make the stem thinner.

Pierce a hole, turning the metal drill by hand.

Cut the stem above the hole

Shorten the side branches.

Cut the anchor from the stem, and make the bottom part of the anchor thinner. Then, go on carving until you get the final shape.

Here is the anchor, before and after sanding it with a fish (mustelus) skin.

How does the fastening anchor work ? One end of the necklace goes through the hole, the other end makes a loop closed by a knot (or rather a splice). The anchor should tightly cling into the loop to close the necklace.