This pattern is popular in knitting and quilting! The original pattern in garter stitch is in Lady’s Book of Knitting, Containing New and Easy Patterns… from 1886. The diamonds’ light/medium/dark arrangement is essential for the illusion of a 3-dimensional box. I recommend using a 60 degree diamond template for blocking. (I had to re-block my too-skinny diamonds after printing the correct shape off the internet.)
Diamonds are about 7” tall and 4” wide when blocked. Patons Kroy Sock colors I used are “Seashell Colors”, “Grey Marl” and “Gentry Grey” but any light/medium/dark color combination will work. A diamond takes about half an hour to knit.

Skills needed: cast on, knit, knit front and back of 1 stitch, slip purl-wise, SSK, purl and p2tog.

Gauge is not important in this pattern. Any block-able yarn/thread will work. Make a swatch to check gauge and appearance.

15 yards of Patons Kroy Sock yarn will make a diamond in the stated gauge. 3 diamonds make a box/hexagon.
1 50gm Patons Kroy Sock skein will make about 10 diamonds.