So what’s the difference between Mosaic Crochet and Interlocking Crochet?
Even though many crocheters use the terms interchangeably online, the technique used for Mosaic Crochet is actually quite different than the technique used for Interlocking Crochet. I was prompted to do some additional research by Tara S (thank you Tara) for my post because I had, as many others have, mistakenly used the terms interchangeably.
Here’s what you need to know:
Interlocking Crochet (also known as double filet crochet, triple filet crochet, locking crochet and intermesh crochet)
Interlocking Crochet uses a technique that combines two, or more filet mesh stitch patterns together to create intricate geometric and mosaic designs.
This means, the finished fabric is double thick because you are essentially placing 1 piece of crocheted fabric on top of a second piece of crocheted fabric and working around and through the opposite color of stitches.
You are never actually working into the fabric you are crocheting with the other color of yarn.
What I mean is, when you are working with Color A Yarn, you will never crochet into Color B Yarn.
You will work around the stitches and spaces you crocheted in Color B yarn and then back into the Color A Yarn side of your fabric. This creates 2 pieces of fabric that are stuck together by working around the chain spaces and stitches of the opposite color. When you look at the back, there is a different design than the design on the front.
You can create great mosaic designs using this technique but it is not actually called Mosaic Crochet.
You can see a great visual example of how use the interlocking crochet technique in this post from Tanis Galik: IC Techniques
Mosaic Crochet is similar to Mosaic Knitting. You follow charts which are worked back and forth in rows, using a single color of yarn for every row you work. The finished fabric is thinner because you are only working with one fabric layer.
For the purposes of this explanation I am using white and black yarn.
To begin you will work your foundation row in single crochet. You would choose the opposite color to the first square on the bottom right of the chart. So if your chart has a black square in the bottom right corner, you would begin with your white yarn and work 1 row of stitches (the same number as the chart across = 10) in foundation single crochet.
Then you would begin working the chart back and forth in rows. Each row on the chart represents 2 rows. So, you begin bottom right and work across the chart from right to left (from the 1 to the 2), then turn your work, ch 1 and work back across the same row of the chart, from left to right (from 2 to 1). The return row will be the same as what you just crocheted. At the end of Row 2 you can either finish off your yarn or carry it up the side edge of the project if you are adding an edging later on.
When you are working the rows in black yarn:
For every black square on the chart, you will single crochet and for every white square you will chain. When you chain, you chain the number of squares in white + 1 extra chain.
When you are working the rows in white yarn:
For every white square that is located above a black square, you will work a single crochet. When you see a white square over a white square, you will work in front of the chain stitches and crochet a dropped double crochet stitch into the sc 2 rows below.
When you look on the back, you will see horizontal rows of each color in Mosaic Crochet.
There is a fantastic tutorial available at ClearlyHelena to explain how Mosaic Crochet is done when following a Mosaic Knitting Chart.
Dropped Double Crochet Method
A third method which you may also want to look at is loosely based on mosaic knitting. It is the Dropped Double Crochet Method from Shady Lane Crochet.
Lately I have been receiving a lot of requests for Mosaic Granny Square Patterns and also for Mosaic Crochet Stitch Patterns. Since many designers are using the terms interchangeably, this roundup includes Mosaic and Interlocking Crochet Patterns. I thought you might appreciate a roundup of these different free patterns and tutorials.
Mosaic Granny Squares and Mosaic Crochet Stitch Patterns
When the original blog is no longer available online I have included the link to the Wayback Machine (from the Internet Archive) ‘snap shot’ of the pattern. For those of you who are not familiar with the wayback machine, it is an online internet archive that takes snapshots of posts that are on the world wide web and then stores them in case someone needs them later. Like us 😉 So have fun making these and be sure to save copies!
Extra Mosaic Crochet resources (You’ll want to save these ones for later!)
Sylvia Cosh & James Walters Crochet Double Filet Crochet and Intermeshing crochet which outlines the difference between double filet and triple filet crochet.
This beautiful design is a 12 inch by 12 inch square. Medium weight  Yarn and a 5.5 mm (I) hook were used to create the project.Read More
This pattern is written in both English and Dutch. You need DK Weight (Light Weight)  yarn and a 4 mm (G) hook.Read More
Crocheted with super bulky yarn  and a 9 mm (M/N) hook. The finished rug is 22 inches by 32 inches but can be customized to any size.Read More
Download the free PDF pattern for this 50 inch by 60 inch beach blanket. Crocheted with medium weight yarn  and a 5.5 mm (I) hook.Read More
Use this mosaic stitch with medium weight yarn  and a 5.5 mm (I) hook. The finished blanket is 32 inches by 38 inches.Read More
These place mats are 13 inches by 19 inches in size but you can easily resize them to make them 12 inches by 12 inches. You need medium weight yarn  and a 5.5. mm (I) hook.Read More
This beautiful design makes is a 57 inch square throw using medium weight yarn  and a 6 mm (J) hook. Get the free PDF download here.Read More
This beautiful blanket uses Medium Weight Yarn  and a 5 mm (H) hook. The finished blanket is 33 inches by 40 inches and is super pretty!Read More
There are tons of great patterns here. Scroll to #18 for Double Filet Basics and #19 is the Double Filet Neckpurse.Read More
Learn the difference between double filet and triple filet and see examples of intermeshing projects.Read More