diff --git a/changelog_unreleased/graphql/pr-8006.md b/changelog_unreleased/graphql/pr-8006.md
new file mode 100644
index 000000000..29892f724
--- /dev/null
+++ b/changelog_unreleased/graphql/pr-8006.md
@@ -0,0 +1,33 @@
+#### Fix comments between interfaces ([#8006](https://github.com/prettier/prettier/pull/8006) by [@fisker](https://github.com/fisker))
+
+<!-- prettier-ignore -->
+```graphql
+# Input
+type Type1 implements
+    A  &
+# comment 1
+    B
+# comment 2
+ &  C {a: a}
+
+# Prettier stable
+type Type1 implements A & # comment 1
+B & # comment 2
+C {
+  a: a
+}
+
+# Prettier stable (Second format)
+type Type1 implements A & B & C { # comment 1 # comment 2
+  a: a
+}
+
+# Prettier master
+type Type1 implements A &
+# comment 1
+B &
+# comment 2
+C {
+  a: a
+}
+```
diff --git a/src/language-graphql/printer-graphql.js b/src/language-graphql/printer-graphql.js
index 8daa52160..5da58a97b 100644
--- a/src/language-graphql/printer-graphql.js
+++ b/src/language-graphql/printer-graphql.js
@@ -662,14 +662,6 @@ function printComment(commentPath) {
   throw new Error("Not a comment: " + JSON.stringify(comment));
 }
 
-function determineInterfaceSeparatorBetween(first, second, options) {
-  const textBetween = options.originalText
-    .slice(first.loc.end, second.loc.start)
-    .replace(/#.*/g, "")
-    .trim();
-
-  return textBetween === "," ? ", " : " & ";
-}
 function printInterfaces(path, options, print) {
   const node = path.getNode();
   const parts = [];
@@ -678,18 +670,21 @@ function printInterfaces(path, options, print) {
 
   for (let index = 0; index < interfaces.length; index++) {
     const interfaceNode = interfaces[index];
-    if (index > 0) {
-      parts.push(
-        determineInterfaceSeparatorBetween(
-          interfaces[index - 1],
-          interfaceNode,
-          options
-        )
-      );
-    }
-
     parts.push(printed[index]);
+    const nextInterfaceNode = interfaces[index + 1];
+    if (nextInterfaceNode) {
+      const textBetween = options.originalText.slice(
+        interfaceNode.loc.end,
+        nextInterfaceNode.loc.start
+      );
+      const hasComment = textBetween.includes("#");
+      const separator = textBetween.replace(/#.*/g, "").trim();
+
+      parts.push(separator === "," ? "," : " &");
+      parts.push(hasComment ? line : " ");
+    }
   }
+
   return parts;
 }
 
diff --git a/tests/graphql_comments/__snapshots__/jsfmt.spec.js.snap b/tests/graphql_comments/__snapshots__/jsfmt.spec.js.snap
index 3f1dc01f7..14163614a 100644
--- a/tests/graphql_comments/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/graphql_comments/__snapshots__/jsfmt.spec.js.snap
@@ -45,6 +45,32 @@ query {
 ================================================================================
 `;
 
+exports[`interfaces.graphql format 1`] = `
+====================================options=====================================
+parsers: ["graphql"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+type Type1
+implements
+A & B &
+# comment 1
+                 C & D &
+# comment 2
+ E {a: a}
+
+=====================================output=====================================
+type Type1 implements A & B &
+# comment 1
+C & D &
+# comment 2
+E {
+  a: a
+}
+
+================================================================================
+`;
+
 exports[`tokens.graphql format 1`] = `
 ====================================options=====================================
 parsers: ["graphql"]
diff --git a/tests/graphql_comments/interfaces.graphql b/tests/graphql_comments/interfaces.graphql
new file mode 100644
index 000000000..4698822df
--- /dev/null
+++ b/tests/graphql_comments/interfaces.graphql
@@ -0,0 +1,7 @@
+type Type1
+implements
+A & B &
+# comment 1
+                 C & D &
+# comment 2
+ E {a: a}
diff --git a/tests/graphql_interface/__snapshots__/jsfmt.spec.js.snap b/tests/graphql_interface/__snapshots__/jsfmt.spec.js.snap
index cd136b49d..19dd8a7cf 100644
--- a/tests/graphql_interface/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/graphql_interface/__snapshots__/jsfmt.spec.js.snap
@@ -305,19 +305,22 @@ type Type2 implements A, B, C, D {
   a: a
 }
 
-type Type3 implements A, # &&&&&&&& comment line 1
+type Type3 implements A,
+# &&&&&&&& comment line 1
 # &&&&&&&& comment line 2
 B & C, D {
   a: a
 }
 
-type Type4 implements A, # &&&&&&&& comment line 1
+type Type4 implements A,
+# &&&&&&&& comment line 1
 # &&&&&&&& comment line 2
 B & C, D {
   a: a
 }
 
-type Type5 implements A, # &&&&&&&& comment line 1
+type Type5 implements A,
+# &&&&&&&& comment line 1
 # &&&&&&&& comment line 2
 B & C, D {
   a: a
diff --git a/tests_config/run_spec.js b/tests_config/run_spec.js
index 35db4ffa4..81d811b5e 100644
--- a/tests_config/run_spec.js
+++ b/tests_config/run_spec.js
@@ -28,7 +28,6 @@ const unstableTests = new Map(
     "comments/return-statement.js",
     "comments/tagged-template-literal.js",
     "comments_closure_typecast/iife.js",
-    "graphql_interface/separator-detection.graphql",
     "markdown_footnoteDefinition/multiline.md",
     "markdown_spec/example-234.md",
     "markdown_spec/example-235.md",