diff --git a/lib/browser/index.js b/lib/browser/index.js
index 175fe939..1830df93 100644
--- a/lib/browser/index.js
+++ b/lib/browser/index.js
@@ -151,7 +151,6 @@ export default class Realm {
 // Non-mutating methods:
 util.createMethods(Realm.prototype, objectTypes.REALM, [
     'close',
-    'isValid',
 ]);
 
 // Mutating methods:
diff --git a/lib/browser/objects.js b/lib/browser/objects.js
index f0f78220..674023a5 100644
--- a/lib/browser/objects.js
+++ b/lib/browser/objects.js
@@ -23,10 +23,18 @@ import { getterForProperty, setterForProperty } from './util';
 
 const registeredConstructors = {};
 
+export default class RealmObject {
+}
+
+// Non-mutating methods:
+createMethods(RealmObject.prototype, objectTypes.OBJECT, [
+    'isValid',
+]);
+
 export function create(realmId, info) {
     let schema = info.schema;
     let constructor = (registeredConstructors[realmId] || {})[schema.name];
-    let object = constructor ? Object.create(constructor.prototype) : {};
+    let object =  Object.create(constructor ? constructor.prototype : RealmObject.prototype);
 
     object[keys.realm] = realmId;
     object[keys.id] = info.id;
diff --git a/src/js_realm.hpp b/src/js_realm.hpp
index a3b520ab..9b2fa25e 100644
--- a/src/js_realm.hpp
+++ b/src/js_realm.hpp
@@ -138,7 +138,6 @@ class Realm {
     static void create(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
     static void delete_one(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
     static void delete_all(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
-    static void is_object_valid(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
     static void write(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
     static void add_listener(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
     static void remove_listener(ContextType, ObjectType, size_t, const ValueType[], ReturnValue &);
@@ -213,7 +212,6 @@ struct RealmClass : ClassDefinition<T, SharedRealm> {
         {"create", wrap<Realm::create>},
         {"delete", wrap<Realm::delete_one>},
         {"deleteAll", wrap<Realm::delete_all>},
-        {"isValid", wrap<Realm::is_object_valid>},
         {"write", wrap<Realm::write>},
         {"addListener", wrap<Realm::add_listener>},
         {"removeListener", wrap<Realm::remove_listener>},
@@ -233,11 +231,13 @@ inline typename T::Function Realm<T>::create_constructor(ContextType ctx) {
     FunctionType collection_constructor = ObjectWrap<T, CollectionClass<T>>::create_constructor(ctx);
     FunctionType list_constructor = ObjectWrap<T, ListClass<T>>::create_constructor(ctx);
     FunctionType results_constructor = ObjectWrap<T, ResultsClass<T>>::create_constructor(ctx);
+    FunctionType realm_object_constructor = ObjectWrap<T, RealmObjectClass<T>>::create_constructor(ctx);
 
     PropertyAttributes attributes = PropertyAttributes(ReadOnly | DontEnum | DontDelete);
     Object::set_property(ctx, realm_constructor, "Collection", collection_constructor, attributes);
     Object::set_property(ctx, realm_constructor, "List", list_constructor, attributes);
     Object::set_property(ctx, realm_constructor, "Results", results_constructor, attributes);
+    Object::set_property(ctx, realm_constructor, "RealmObject", realm_object_constructor, attributes);
 
     return realm_constructor;
 }
@@ -456,19 +456,6 @@ void Realm<T>::delete_all(ContextType ctx, ObjectType this_object, size_t argc,
         ObjectStore::table_for_object_type(realm->read_group(), objectSchema.name)->clear();
     }
 }
-    
-template<typename T>
-void Realm<T>::is_object_valid(ContextType ctx, ObjectType this_object, size_t argc, const ValueType arguments[], ReturnValue &return_value) {
-    validate_argument_count(argc, 1);
-    
-    ObjectType arg = Value::validated_to_object(ctx, arguments[0]);
-    if (Object::template is_instance<RealmObjectClass<T>>(ctx, arg)) {
-        return_value.set(get_internal<T, RealmObjectClass<T>>(arg)->is_valid());
-    }
-    else {
-        throw std::runtime_error("Object is not a Realm Object");
-    }
-}
 
 template<typename T>
 void Realm<T>::write(ContextType ctx, ObjectType this_object, size_t argc, const ValueType arguments[], ReturnValue &return_value) {
@@ -484,7 +471,7 @@ void Realm<T>::write(ContextType ctx, ObjectType this_object, size_t argc, const
     }
     catch (std::exception &e) {
         realm->cancel_transaction();
-        throw e;
+        throw;
     }
 
     realm->commit_transaction();
diff --git a/src/js_realm_object.hpp b/src/js_realm_object.hpp
index c5df2226..f682c67c 100644
--- a/src/js_realm_object.hpp
+++ b/src/js_realm_object.hpp
@@ -46,6 +46,8 @@ class RealmObject {
     static void get_property(ContextType, ObjectType, const String &, ReturnValue &);
     static bool set_property(ContextType, ObjectType, const String &, ValueType);
     static std::vector<String> get_property_names(ContextType, ObjectType);
+    
+    static void is_valid(ContextType, ObjectType, size_t, const ValueType [], ReturnValue &);
 };
 
 template<typename T>
@@ -59,8 +61,23 @@ struct RealmObjectClass : ClassDefinition<T, realm::Object> {
         wrap<RealmObject::set_property>,
         wrap<RealmObject::get_property_names>,
     };
+    
+    using ContextType = typename T::Context;
+    using ObjectType = typename T::Object;
+    using ValueType = typename T::Value;
+    using ReturnValue = js::ReturnValue<T>;
+
+
+    MethodMap<T> const methods = {
+        {"isValid", wrap<RealmObject::is_valid>},
+    };
 };
 
+template<typename T>
+void RealmObject<T>::is_valid(ContextType ctx, ObjectType this_object, size_t argc, const ValueType arguments[], ReturnValue &return_value) {
+    return_value.set(get_internal<T, RealmObjectClass<T>>(this_object)->is_valid());
+}
+    
 template<typename T>
 typename T::Object RealmObject<T>::create_instance(ContextType ctx, realm::Object &realm_object) {
     static String prototype_string = "prototype";
diff --git a/src/object-store/src/object_accessor.hpp b/src/object-store/src/object_accessor.hpp
index fc86a62c..9727fe45 100644
--- a/src/object-store/src/object_accessor.hpp
+++ b/src/object-store/src/object_accessor.hpp
@@ -48,7 +48,7 @@ namespace realm {
         const ObjectSchema &get_object_schema() { return *m_object_schema; }
         Row row() { return m_row; }
         
-        bool is_valid() { return m_row.is_attached(); }
+        bool is_valid() const { return m_row.is_attached(); }
 
     private:
         SharedRealm m_realm;
@@ -147,9 +147,7 @@ namespace realm {
     //
     template <typename ValueType, typename ContextType>
     inline void Object::set_property_value(ContextType ctx, std::string prop_name, ValueType value, bool try_update)
-    {
-        verify_attached();
-        
+    {        
         const Property *prop = m_object_schema->property_for_name(prop_name);
         if (!prop) {
             throw InvalidPropertyException(m_object_schema->name, prop_name,
@@ -161,8 +159,6 @@ namespace realm {
     template <typename ValueType, typename ContextType>
     inline ValueType Object::get_property_value(ContextType ctx, std::string prop_name)
     {
-        verify_attached();
-
         const Property *prop = m_object_schema->property_for_name(prop_name);
         if (!prop) {
             throw InvalidPropertyException(m_object_schema->name, prop_name,
@@ -176,6 +172,8 @@ namespace realm {
     {
         using Accessor = NativeAccessor<ValueType, ContextType>;
 
+        verify_attached();
+
         if (!m_realm->is_in_transaction()) {
             throw MutationOutsideTransactionException("Can only set property values within a transaction.");
         }
@@ -240,6 +238,8 @@ namespace realm {
     {
         using Accessor = NativeAccessor<ValueType, ContextType>;
 
+        verify_attached();
+
         size_t column = property.table_column;
         if (property.is_nullable && m_row.is_null(column)) {
             return Accessor::null_value(ctx);
diff --git a/tests/js/object-tests.js b/tests/js/object-tests.js
index addc067a..2edf89e6 100644
--- a/tests/js/object-tests.js
+++ b/tests/js/object-tests.js
@@ -431,5 +431,29 @@ module.exports = BaseTest.extend({
                 object.dataCol = [1];
             });
         });
-    }
+    },
+
+    testObjectConstructor: function() {
+        var realm = new Realm({schema: [schemas.TestObject]});
+        realm.write(function() {
+            var obj = realm.create('TestObject', {doubleCol: 1});
+            TestCase.assertTrue(obj instanceof Realm.RealmObject);
+        });
+    },
+
+    testIsValid: function() {
+        var realm = new Realm({schema: [schemas.TestObject]});
+        var obj;
+        realm.write(function() {
+            obj = realm.create('TestObject', {doubleCol: 1});
+            TestCase.assertEqual(obj.isValid(), true);
+            realm.delete(obj);
+            TestCase.assertEqual(obj.isValid(), false);
+        });
+
+        TestCase.assertEqual(obj.isValid(), false);
+        TestCase.assertThrows(function() {
+            obj.doubleCol;
+        });
+    },
 });
diff --git a/tests/js/realm-tests.js b/tests/js/realm-tests.js
index ecd130e2..3e6aec72 100644
--- a/tests/js/realm-tests.js
+++ b/tests/js/realm-tests.js
@@ -516,22 +516,6 @@ module.exports = BaseTest.extend({
         TestCase.assertEqual(realm.objects('IntPrimaryObject').length, 0);
     },
 
-    testIsValid: function() {
-        var realm = new Realm({schema: [schemas.TestObject]});
-        var obj;
-        realm.write(function() {
-            obj = realm.create('TestObject', {doubleCol: 1});
-            TestCase.assertEqual(realm.isValid(obj), true);
-            realm.delete(obj);
-            TestCase.assertEqual(realm.isValid(obj), false);
-        });
-
-        TestCase.assertEqual(realm.isValid(obj), false);
-        TestCase.assertThrows(function() {
-            obj.doubleCol;
-        });
-    },
-
     testRealmObjects: function() {
         var realm = new Realm({schema: [schemas.PersonObject, schemas.DefaultValues, schemas.TestObject]});