diff --git a/lib/neography/relationship.rb b/lib/neography/relationship.rb
index 383fac4..3f4f3a9 100644
--- a/lib/neography/relationship.rb
+++ b/lib/neography/relationship.rb
@@ -16,6 +16,14 @@ def create(type, from_node, to_node, props = nil)
         rel
       end
 
+      def create_unique(index, key, value, type, from_node, to_node, props = nil)
+        rel = Neography::Relationship.new(from_node.neo_server.create_unique_relationship(index, key, value, type, from_node, to_node, props))
+        rel.start_node = from_node
+        rel.end_node = to_node
+        rel.rel_type = type
+        rel
+      end
+
       def load(rel, db = Neography::Rest.new)
         raise ArgumentError.new("syntax deprecated") if rel.is_a?(Neography::Rest)
 
diff --git a/lib/neography/rest.rb b/lib/neography/rest.rb
index 1886d53..69f5cf1 100644
--- a/lib/neography/rest.rb
+++ b/lib/neography/rest.rb
@@ -347,8 +347,8 @@ def create_relationship_auto_index(type = "exact", provider = "lucene")
       @relationship_indexes.create_auto(type, provider)
     end
 
-    def create_unique_relationship(index, key, value, type, from, to)
-      @relationship_indexes.create_unique(index, key, value, type, from, to)
+    def create_unique_relationship(index, key, value, type, from, to, props = nil)
+      @relationship_indexes.create_unique(index, key, value, type, from, to, props)
     end
 
     def add_relationship_to_index(index, key, value, id)
diff --git a/lib/neography/rest/relationship_indexes.rb b/lib/neography/rest/relationship_indexes.rb
index b0a2aa6..9657b43 100644
--- a/lib/neography/rest/relationship_indexes.rb
+++ b/lib/neography/rest/relationship_indexes.rb
@@ -17,13 +17,14 @@ def initialize(connection)
         super(connection, :relationship)
       end
 
-      def create_unique(index, key, value, type, from, to)
+      def create_unique(index, key, value, type, from, to, props = nil)
         body = {
           :key   => key,
           :value => value,
           :type  => type,
           :start => @connection.configuration + "/node/#{get_id(from)}",
-          :end   => @connection.configuration + "/node/#{get_id(to)}"
+          :end   => @connection.configuration + "/node/#{get_id(to)}",
+          :properties => props
         }
         options = { :body => body.to_json, :headers => json_content_type }
 
diff --git a/spec/unit/rest/relationship_indexes_spec.rb b/spec/unit/rest/relationship_indexes_spec.rb
index 085e3a7..d98e2ce 100644
--- a/spec/unit/rest/relationship_indexes_spec.rb
+++ b/spec/unit/rest/relationship_indexes_spec.rb
@@ -47,10 +47,11 @@ class Rest
           "value"      => "value",
           "type"       => "type",
           "start"      => "http://configuration/node/42",
-          "end"        => "http://configuration/node/43"
+          "end"        => "http://configuration/node/43",
+          "properties" => "properties"
         }
         connection.should_receive(:post).with("/index/relationship/some_index?unique", json_match(:body, expected_body))
-        subject.create_unique("some_index", "key", "value", "type", "42", "43")
+        subject.create_unique("some_index", "key", "value", "type", "42", "43", "properties")
       end
 
       it "adds a relationship to an index" do