Avatar With Gradient Border

import 'package:extended_image/extended_image.dart';
import 'package:flutter/material.dart';
import 'package:gradient_borders/box_borders/gradient_box_border.dart';

DecoratedBox(
  decoration: const BoxDecoration(
    shape: BoxShape.circle,
    border: GradientBoxBorder(
      gradient: LinearGradient(
        begin: Alignment.topLeft,
        end: Alignment.bottomRight,
        colors: [
          Colors.redAccent,
          Colors.purple,
        ],
      ),
      width: 2,
    ),
  ),
  child: Padding(
    padding: const EdgeInsets.all(6),
    child: ClipOval(
      child: ExtendedImage.network(
        'https://images.pexels.com/photos/846741/pexels-photo-846741.jpeg?auto=compress&cs=tinysrgb&w=600',
        fit: BoxFit.cover,
        width: 48 - 6 - 2,
        height: 48 - 6 - 2,
      ),
    ),
  ),
),