Stackable Crescent Ring

 *****      *      *****         *        *  ******    *****   
*     *    * *    *     *        *        *  *     *  *     *  
*     *    * *    *              *        *  *     *  *        
*     *   *   *    *****         *        *  *     *   *****   
*     *   *****         *        *        *  *     *        *  
*     *  *     *  *     *  *     *  *     *  *     *  *     *  
 *****   *     *   *****    *****    *****   ******    *****