Oyster stitch is a surface embroidery stitch that is used to quickly embroider small petals and leaves. It is a variation of twisted chain stitch.
Bring the needle up (at A). For regular chain stitch, we will be going back down at A. For twisted chain stitch, we will be going down near A like shown below. Go down at B and come back up at C.
Wrap the working thread above and then below the needle as shown below.
A twisted chain is ready. Now lace the needle through the twisted part of the chain very close to A. Note how the needle passes only under one of the legs of the chain stitch.
Pull the needle through and you will get something that resembles a pretzel (shown below)
Oyster stitch is made up of two concentric chain stitches.
Go down again very close to A and come back up at the tip of the chain.
Wrap the working thread around the chain and under the needle and pull the needle.
Anchor the stitch to the fabric by going down like shown below.
Small flowers can be embroidered quickly using this stitch.
The center is made with bullion knot.