Relief Crochet Rhombs Stitch
Make a chain of 7 chain sts + 1 st for the symmetry + 1 half chain st.
1st row: half chain st, 1 single crochet, * 6 chain sts, 1 single crochet into 2nd from the edge st and continue with other chain sts: 1 half double corhcet, 1 double crochet, 1 treble crochet, 1 triple treble crochet, 1 single crochet into the 7th chain st*; repeat from * to *.
2nd row: 5 half chain sts, * 1 slip st in the chain st of the previous row (top of the triangle), then crochet into the chain sts of the previous row: 1 single crochet, 1 half double corhcet, double crochet, 1 treble crochet, 1 triple treble crochet*, repeat from * to *, in the end make 1 triple treble crochet in the edging single crochet of the previous row.
Repeat 1st and 2nd rows to the needed size.