Rose quartz - Rose quartz is a beautiful soft pink stone, it is definitely the stone of the heart and carries a soft femine energy of compassion and peace, tenderness and healing, nourishment and comfort. It is often referred to as the "love stone" and helps open up the heart to love, and not just in relationships! It helps us open up to all forms of love, self love, family love, platonic love and romantic love.
Wear it in a necklace close to your heart chakra to have the full effects of the stone. Don't forget to speak to your stone and tell it your desires. After this forget about it and set your minds intention as if you already have your desire and watch how fast it manifests!
Just remember though that the stone can't change another persons free will. So be mindful of what you ask of your stone! Rather than saying to it "bring back my ex..." try saying "Please help me attract the person who is my true love".
You can also ask your stone to send you a "sign" to let you know they have heard you and you are on the right path. This can be as specific as you want, try to make it something which you don't see everyday, like a number sequence or a word, maybe an animal you don't see every day, or both! For example "please show me a sign of 5 black swans to let me know you have heard me"