Lost gold necklace with cross pendant

Hi. I lost my gold necklace with a cross pendant last august 11 or 12, 2013.. I thought i had put it inside the pocket of my bag. But it wasnt there. I tried searching inside my room but i didnt found my necklace. Will you help me find it? Thank you so much. I am so desperate in finding it. It was given to me by my step father last year during my birthday. Where can i possibly find my necklace? Will you help me please? Thank you!