Index: src/wp-admin/css/list-tables.css
===================================================================
--- src/wp-admin/css/list-tables.css	(revision 43343)
+++ src/wp-admin/css/list-tables.css	(working copy)
@@ -220,6 +220,21 @@
 	background-color: #fef7f1;
 }
 
+#the-comment-list .unapproved td:first-child {
+	position: relative;
+}
+
+#the-comment-list .unapproved td:first-child:before {
+	content: "";
+	display: block;
+	position: absolute;
+	left: 0;
+	top: 0;
+	bottom: 0;
+	background: #d54e21;
+	width: 4px;
+}
+
 #the-comment-list .unapproved th.check-column {
 	border-left: 4px solid #d54e21;
 }
@@ -1758,6 +1773,21 @@
 		display: block;
 	}
 
+	#the-comment-list .unapproved td:first-child:before {
+		display: none;
+	}
+
+	#the-comment-list .unapproved .column-comment:before {
+		content: "";
+		display: block;
+		position: absolute;
+		left: 0;
+		top: 0;
+		bottom: 0;
+		background: #d54e21;
+		width: 4px;
+	}
+
 	#the-comment-list .is-expanded td {
 		box-shadow: none;
 	}