Inspired by Summer Romance Square
I made significant changes starting round 7.

Round 01: 16DC
Round 07: Replaced hearts with diamonds. Before and after each diamond a stitch is skipped but a chain is not made. A Diamond is 3 stitches across but the base is crocheted in a single stitch.
(Diamond Part 1: DC in a stitch, DC in base of DC just made, DC in base of first DC made resulting in a solid V shape made of 3DC,)
Round 08:(Diamond Part 2: Chain 1, YO, draw up loop in first DC of diamond, YO, draw through 2 loops on hook, leave 2 loops on hook, YO, draw up loop in second DC of diamond, YO, draw through 2 loops on hook, leave 3 loops on hook, YO, draw up loop in third DC of diamond, YO, draw through 2 loops on hook, YO, draw through 4 loops on hook)
Round 09-12: Experimented with the final rows to prevent waves and make it look right.