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Basic Gem
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A truncated triangular dipyramid with three fourfold and three twofold rotations.

This puzzle is the result of an exercise in making the Dayan Gem VI geometry as simple as possible. It succeeds the Junior Gem from the same inventor. He wondered how much further the pattern could be extrapolated. He considers this to be the non-trivial limit.

The geometry consists of three squares and six irregular pentagons (forming an associahedron), or truncated triangular dipyramid. The puzzle makes two types of turns.
1. on the square faces in steps of 90 degrees (image 4)
2. on the three opposing edges in steps of 180 degrees (image 5)

Just like with the original Dayan Gem VI, what we have here is two types of turning per axis of rotation, with one having twice the rotational symmetry of the other.
This puzzle holds itself together fine without screws, although the inventor added them to the square centers to reduce any floppiness. Turning quality on this puzzle is fantastic as usual, although a tad unstable for my liking on the square faces.
It was the first puzzle 2019 presented in the forum.
Edge length: 35 mm (equatorial)
Weight: 61 grams

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