Diamond Lattice is a multiple of 8 stitches.
Row 1 - righ side: P3, * 1/1RC, p6; rep from * to last 5 sts, 1/1RC, p3.
All even number rows: Knit the knit stitches and purl the purl stitches.
Row 3: P2, * 1/1RPC, 1/1LPC, p4; rep from * to last 6 sts, 1/1RPC, 1/1LPC, p2.
Row 5: P1, * 1/1RPC, p2, 1/1LPC, p2; rep from * to last 7 sts, 1/1RPC, p2, 1/1LPC, p1.
Row 7: * 1/1RPC, p4, 1/1LPC; rep from * to end.
Row 9: K1, * p6, 1/1LC; rep from * to last 7 sts, p6, k1.
Row 11: * 1/1LPC, p4, 1/1RPC; rep from * to end.
Row 13: P1, * 1/1LPC, p2, 1/1RPC, p2; repeat from * to last 7 sts, 1/1LPC, p2, 1/1RPC, p1.
Row 15: P2, * 1/1LPC, 1/1RPC, p4; rep from * to last 6 sts, 1/1LPC, 1/1RPC, p2.
Repeat Rows 1 - 16.
Abbreviations:
1/1RC: Skip the first stitch, knit the second stitch, then knit the skipped stitch. Slip both stitches from the needle together.
1/1LC: Skip the first stitch, knit through the backloop the second stitch, then knit the skipped stitch. Slip both stitches from the needle together.
1/1RPC: Skip the first stitch, knit the second stitch, leave on needle, then purl the skipped stitch. Slip both stitches from the needle together.
1/1LPC: Skip the first stitch, purl through the backloop the second stitch, then knit the skipped stitch. Slip both stitches from the needle together.