diff --git a/data/fields/diameter_crown.json b/data/fields/diameter_crown.json
new file mode 100644
index 00000000..5ac131a9
--- /dev/null
+++ b/data/fields/diameter_crown.json
@@ -0,0 +1,7 @@
+{
+    "key": "diameter_crown",
+    "type": "combo",
+    "label": "Crown diameter",
+    "snake_case": false,
+    "placeholder": "5 mm, 10 cm, 15 in…"
+}