Shine Like A Diamond Tank — Free Crochet Pattern
There is something deeply satisfying about wearing a garment you made yourself, especially when it catches the light in a way that makes people stop and ask where you got it. The Shine Like A Diamond Tank is exactly that kind of project — a stunning, textured crochet top that combines elegant diamond stitch patterns with a relaxed, wearable silhouette. Whether you are a seasoned crocheter looking for a new wardrobe staple or an adventurous intermediate maker ready to level up, this free pattern is going to become one of your favorites.
In this post, you will find everything you need to crochet your very own diamond tank from scratch, including materials, sizing notes, stitch guide, and full step-by-step pattern instructions. Grab your hook, pour yourself something to drink, and let’s get into it.
Why You’ll Love This Pattern
Before we dive into the details, let’s talk about what makes this tank top so special. The diamond stitch creates a gorgeous raised, geometric texture that looks incredibly intricate but is built from basic crochet stitches you probably already know. The repeating pattern works up in a rhythmic, almost meditative way once you get into the groove of it, which means you can carry this project to movie nights, road trips, and lazy Sunday afternoons without losing your place.
The silhouette is loose and flowy without being shapeless. It sits beautifully at the hip and works over a bralette, bandeau, or fitted tank underneath, making it as versatile as it is beautiful. Wear it to the beach with high-waisted linen shorts, tuck it into a midi skirt for a summer lunch, or throw it over a swimsuit at the pool. The diamond tank moves through every season of warm weather with effortless style.
Best of all, this is a free pattern, so the only investment you need to make is your time, your yarn, and your enthusiasm.
Materials You Will Need
Getting your materials sorted before you begin is one of the best things you can do to set yourself up for a smooth crochet experience. Here is what you will need to complete the Shine Like A Diamond Tank.
Yarn: Approximately 300 to 500 yards of lightweight cotton or cotton-blend yarn, depending on your size. A size 2 or 3 fingering to sport weight yarn works beautifully for this project, giving the fabric a soft drape that flows against the body. Cotton is highly recommended because it breathes well in warm weather and holds the structure of the diamond stitch clearly. Some wonderful choices include Paintbox Cotton DK, Lion Brand 24/7 Cotton, or any similar yarn you love working with.
Hook: A 4.0 mm (US G/6) crochet hook is recommended as a starting point, but always swatch first because your tension will be the deciding factor. Some crocheters work tightly and may need to size up to a 4.5 mm hook.
Notions: A tapestry needle for weaving in ends, scissors, stitch markers, and a measuring tape. That’s it — this project is beautifully low-maintenance in terms of notions.
Gauge: 18 stitches and 20 rows equal 4 inches in the main diamond stitch pattern after blocking. Take the time to swatch and block your gauge square before you begin — cotton yarn in particular can shift slightly with washing, and you want your finished tank to fit the way you imagined.
Sizing Guide
This pattern is written to fit the following bust measurements, and sizing is achieved through adjusting your starting chain count and the number of pattern repeats you work. The diamond stitch works in a repeat of 6 stitches plus a turning chain, which makes it easy to scale up or down to suit your body.
XS — 30 to 32 inch bust
S — 33 to 35 inch bust
M — 36 to 38 inch bust
L — 39 to 41 inch bust
XL — 42 to 44 inch bust
2XL — 45 to 47 inch bust
3XL — 48 to 50 inch bust
The finished garment is designed with approximately 2 to 4 inches of positive ease, meaning you size down to the measurement closest to your actual bust for a relaxed, flowy fit. If you prefer a more fitted look, simply choose a size that matches your bust measurement exactly.
Stitch Abbreviations and Special Stitches
Before you read through the pattern, familiarize yourself with the abbreviations used throughout. US crochet terminology is used for all instructions.
ch — chain
sl st — slip stitch
sc — single crochet
hdc — half double crochet
dc — double crochet
sk — skip
sp — space
rep — repeat
pm — place marker
BLO — back loop only
FLO — front loop only
RS — right side
WS — wrong side
t-ch — turning chain
Diamond Stitch (worked flat, multiple of 6 + 3):
The diamond stitch is the heart of this pattern, and it is built from a combination of double crochets and chain spaces that form a raised, interlocking diamond shape across your fabric. Once you have memorized the four-row repeat, you will find it flows beautifully without needing to reference the pattern constantly.
Pattern Notes
This tank is worked in two flat panels — a front and a back — that are seamed together at the shoulders and sides, leaving armhole openings for the straps, which are then picked up and worked in a simple ribbing or edging. This construction method gives you a very clean, professional finish and makes it easy to try the garment on as you go to check sizing.
You can also work this tank in the round if you prefer seamless construction. To do so, simply work the body as a tube, joining at the end of each round. The pattern notes below the main instructions explain how to adapt for working in the round.
Always turn your work at the end of each row unless otherwise stated. Chain 3 at the beginning of a row counts as a double crochet throughout this pattern.
Blocking is strongly recommended for this pattern. Cotton yarn responds beautifully to wet blocking, which opens up the diamond stitch and gives the finished fabric a gorgeous, even drape. Block before seaming for the easiest results.
The Pattern
Gauge Swatch (Make This First)
Chain 27. This gives you 4 pattern repeats plus 3 foundation stitches.
Row 1 (RS): Dc in 4th ch from hook, dc in next ch, ch 2, sk 2 ch, dc in next ch, ch 2, sk 2 ch, dc in next 3 ch; rep from across to last 6 ch, ch 2, sk 2 ch, dc in next ch, ch 2, sk 2 ch, dc in last 3 ch. Turn.
Row 2 (WS): Ch 3, dc in next 2 dc, 2 dc in ch-2 sp, dc in next dc, 2 dc in next ch-2 sp, dc in next dc; rep from across, dc in top of t-ch. Turn.
Row 3: Ch 3, ch 2, sk 2 dc, dc in next dc, ch 2, sk 2 dc, dc in next dc; rep from across, ending dc in top of t-ch. Turn.
Row 4: Ch 3, 2 dc in ch-2 sp, dc in next dc, 2 dc in next ch-2 sp, dc in next dc; rep from across. Turn.
These four rows form your diamond stitch repeat. Work until your swatch measures at least 6 inches tall, then fasten off, weave in ends, and wet block. Measure carefully before starting your tank.
Front Panel
Foundation Chain: Work a beginning chain as follows for your size, remembering that your chain count should be a multiple of 6 plus 3:
XS: Chain 75
S: Chain 81
M: Chain 87
L: Chain 93
XL: Chain 99
2XL: Chain 105
3XL: Chain 111
Row 1 (RS): Dc in 4th ch from hook (this counts as your first dc group), dc in next ch. Ch 2, sk 2 ch, dc in next ch, ch 2, sk 2 ch, dc in next 3 ch. Rep from across to last 6 ch, ch 2, sk 2 ch, dc in next ch, ch 2, sk 2 ch, dc in last 3 ch. Turn.
Work Rows 2 through 4 as established in your gauge swatch.
Continue repeating Rows 1 through 4 (or Rows 2 through 4 for subsequent repeats, since Row 1 is your foundation row) until your front panel measures 14 inches from the bottom edge, or your desired length to the underarm. End on a WS row.
Armhole Shaping:
On the next RS row, work 1 sl st across the first 6 stitches to shape the armhole opening, then work in pattern across to the last 6 stitches. Leave those last 6 stitches unworked and turn. This creates a neat armhole on each side.
Continue working in the diamond stitch pattern on these remaining stitches, decreasing 1 stitch at each armhole edge every RS row twice more. Work even until the armhole measures 7 inches, or to your desired depth.
Shoulder and Neck Shaping:
On the next row, work across the first third of your stitches for the right shoulder, then fasten off. Rejoin yarn at the center and work the left shoulder to match.
For the neckline, you may work as a straight edge (simply fastening off across the center neck stitches) or work a gentle curved decrease by slip-stitching across 2 stitches at the beginning of each of the next 2 rows before fastening off.
Back Panel
Work the back panel exactly as the front panel through the armhole shaping. The back neckline is worked higher than the front for a classic tank silhouette. Work the back even, without any center neck shaping, until the armhole measures 8 inches, then fasten off all stitches across for a straight back neck edge.
Seaming
With RS facing, lay your front and back panels together. Using your tapestry needle and a length of matching yarn, seam the shoulder edges together using the mattress stitch or whip stitch, leaving the center neck opening free on the front panel. Seam both side edges, leaving the top 7 to 8 inches open on each side for the armholes.
Turn right side out and check the fit before proceeding to the edging.
Neckline Edging
Join yarn at the right shoulder seam with a sl st. Work 1 round of sc evenly around the entire neckline, working 1 sc per stitch across the back neck, and picking up 1 sc for every row end along the shaped front neckline. Join with a sl st to the first sc.
For a ribbed look, work 2 to 3 additional rounds in BLO sc, which creates a lovely textured edge that lays flat and frames the neckline beautifully. Fasten off and weave in ends.
Armhole Edging
Join yarn at the underarm side seam. Work 1 round of sc evenly around each armhole opening, picking up approximately 1 sc per row along the vertical edges and 1 sc per stitch along any horizontal edges. Join and work 1 to 2 additional rounds in BLO sc if you would like a slightly more substantial armhole band. Fasten off.
Bottom Hem Edging
For a clean, finished hem at the bottom of your tank, join yarn at the side seam and work 1 round of sc in BLO across the bottom edge of the front panel, and then across the bottom of the back panel. Join and work 1 to 2 additional rounds if desired. The BLO single crochet creates a subtle ribbing that prevents curling and adds a polished touch.
Finishing and Blocking
Weave in all remaining ends securely using your tapestry needle. Wet block the finished tank by submerging it in cool water, gently squeezing out excess water in a towel, and laying it flat on a blocking mat. Pin to your measurements and allow to dry completely. You will be amazed at how much blocking transforms the diamond stitch — the diamonds open up, the fabric relaxes, and the whole garment takes on a beautiful, even finish.
Tips for Success
Working a new stitch pattern for the first time always comes with a learning curve, and the diamond stitch is no exception. Here are some tips to make your experience with this pattern as smooth as possible.
Count your stitches at the end of every row, especially for the first few repeats. The diamond stitch can sneak in extra stitches if you work into a chain space instead of a stitch, so a quick count after each row saves you from discovering errors later.
Use stitch markers liberally. Placing a marker at the beginning and end of your panel helps you track your edges, and you can also use markers to note the beginning of each pattern repeat until you feel confident.
Work with a contrasting-color foundation chain when you first learn the stitch, or use a longer-tail cast-on so that you can count your chain more easily before you start your first row.
If the diamond pattern ever feels confusing, remember that the pattern essentially alternates between an “open” row where chains and skips create the lattice structure, and a “closed” row where you fill those chains in with solid double crochets. When you are on a closed row, you are filling in the spaces. When you are on an open row, you are creating new ones.
Yarn Substitution Ideas
The beauty of this pattern is that it adapts beautifully to different yarn weights and fibers, as long as you swatch and adjust your hook accordingly. A linen-cotton blend gives a slightly more structured look with beautiful sheen. A bamboo blend adds incredible softness and a subtle drape. If you want to work the tank in a bulkier weight for a different look, try a DK or light worsted and size up your hook accordingly — just know that the finished fabric will be slightly less drapey.
Variegated and tonal yarns can look stunning in this pattern, as the color variation plays beautifully off the geometric diamond shapes. Solid or semi-solid colors, however, tend to show off the texture most clearly, which is a wonderful thing when the texture is as lovely as this one.
Sharing Your Make
If you work up the Shine Like A Diamond Tank, please share it! There is something so joyful about seeing the same pattern made in different yarns, different colors, and on different bodies. Every version is its own beautiful thing, and the crochet community thrives on that shared creativity.
Tag your finished objects on social media, leave a comment below if you have questions or want to share how yours turned out, and feel free to pass this free pattern along to any crochet-loving friends in your life. Patterns meant to be shared, and makers meant to inspire each other.
Happy hooking — may your stitches be even, your tension be consistent, and your finished tank be everything you imagined it to be.
