```html
<ion-thumbnail>
  <img src="https://gravatar.com/avatar/dba6bae8c566f9d4041fb9cd9ada7741?d=identicon&f=y">
</ion-thumbnail>

<ion-item>
  <ion-thumbnail slot="start">
    <img src="https://gravatar.com/avatar/dba6bae8c566f9d4041fb9cd9ada7741?d=identicon&f=y">
  </ion-thumbnail>
  <ion-label>Item Thumbnail</ion-label>
</ion-item>
```