Concentric diamond C2C blanket graph

About this design

This graph makes the most of how corner-to-corner crochet behaves. A diamond is just a square turned on its point, and in C2C its edges run along whole diagonal rows, so the rings come out with clean, even steps. The colours go out from a navy centre in bands four blocks wide: Y35 Navy, Y33 Cornflower, Y31 Baby Blue and a band of Y15 Sunflower that lifts the whole palette. Partial rings fill the four corners, which makes the blanket look as if it were cut from a larger repeating pattern.

How to crochet it

Because the ring edges follow the diagonals, part of each C2C row runs along a ring in a single colour, while the rest of the row crosses the rings at right angles and changes colour every four blocks. Expect long calm stretches followed by busy ones, and keep a bobbin for each section that a diagonal passes through and twist yarns at each change to avoid holes. The sunflower band is the one people notice first, so check it is a full four blocks wide all round before you move on.

Size and finishing

At 45 blocks square, the blanket is about 112 cm across with 2.5 cm worsted-weight blocks, which makes a generous throw or a single-bed topper. Worked with 2 cm DK blocks it is about 90 cm, a good size for a playmat. A navy border of two or three rounds frames the outer rings nicely and hides any wobble along the edge.

Colour plan

Cornflower does the most work, 27% of the 2,025 blocks, followed by Baby Blue at 26%. Every colour is used at least 468 times, so there are no tiny one-off details to hunt for. Every square of the grid is filled.

Working notes

It is worked as 89 diagonal rows; the busiest changes colour 22 times. 4 squares stand alone in their colour, with no same-coloured neighbour along a side: cut a short length of yarn for those instead of carrying it.