Diamond-shaped blocks are probably seen most often in star quilts.
First: Six pointed stars pieced of diamonds cut to 60 degrees.
See more of these last week.
A lovely reproduction from Laundry Basket Quilts
The geometry is the same whether the stars are large or small.
And some times it's tricky, particularly with the 60 degree diamond.
From Laura Fisher Quilts
Notice how she dealt with points that didn't really fit together.
Seamstresses made many more 8-pointed stars than 6-pointed stars.
From Garth Auctions
That geometry fits a square better,
whether pieced of diamonds, strips or strings.
A string star
String quilts are rarely dated. This one is inscribed 1893.
I'd have guessed a little earlier.
Above and below two stars from the American Folk Art Museum.
One could imagine how Plan A
somehow wound up as Plan D.