Gems are rare and precious so make your man chase you: not only do they have a lot
of qualities and value, but they're in-demand simply because they are recognized as in-demand! The same goes for women. You want to be that girl that's worth it and that's the full package, but you also want to be hard to get no matter what. This will trigger the treasure hunter in all men you come across. Also, make sure you are well within his reach.
First of all: make sure he's aware that you're interested in him when you spend time together. He must be aware that you're having a blast. A smile and a positive attitude are both great ways to communicate this. Show some excitement when he calls and let him know you're looking forward to another episode with him.
Now on the other side of things, you want to maintain a very busy and active lifestyle of your own. Be social and live your passions to the fullest. This is good for you and it will show that you're really enjoying him as a person, instead of doing everything out of desperation. Return his calls, but take your time to do so. Don't rush things if your schedule doesn't allow you to do so. Communicate two facts: you are busy AND you enjoy the time you spend with him tremendously.
This whole frame of mind sends the exact message a quality woman is supposed to send: she's independent and in-demand. He will quickly understand that he needs to chase and make some efforts in order to get a woman like you. He will value the time he spends with you and will eventually be willing to commit to get some more.
Fun should be your main priority. How fun is life if you're not living in the moment? Playing hard to get should be a fun way of living, not a strategy that's constantly thought out to manipulate or deceive guys. Trigger great memories and make sure he remembers you.When you're playing hard to get, make sure not to exaggerate all while encouraging an active chase on his part. Stay busy and have loads of fun with him and next thing you know you will become that gem every guy desires.