Fading Diamonds Gauge
17 stitches and 25 rows in 4" in lace pattern.
One full diamond (17 stitches and 28 rows) should measure ~4” x 4.75” / 10 cm x 12 cm.
Please note that row gauge does make a big difference in cardigan and sleeve length, if your row gauge is different from the patterns you may need to make adjustments.