series.margin Number|Object (default: 1)

The margin around each donut series (ring). A numeric value will set all margins.

Example - set the chart donut series margin

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  series: [ {
    type: "donut",
    margin: 30,
    data: [1, 2, 3]
  },{
    type: "donut",
    data: [1, 2, 3]
  }]
});
</script>