If you don't know what size ring she wears, do NOT blatantly ask her, "What size is your ring finger?" She will either become suspicious and excited that you want to buy her a ring, or will become angry at your quick-witted sense of humor. You know you are a smooth cat, so device a plan that will showcase all of your skills.

When you are visiting her home, wait until she goes to the bathroom or steps out to answer a phone call. You could also tell her that the wonderful and always delicious meal she just cooked is not agreeing with your stomach, and that you used the last bit of Pepto-Bismol on your last visit. When she leaves to go to the store, go into the room where she keeps her jewelry.

Now, don't choose her great-grandmother's priceless antique ring that has been in the family for generations. Choose a ring that she rarely wears and carefully slip it into your pocket. If she happens to catch you in the act, think of a quick alibi, such as, "You smelled so good today that I had to find out what that alluring fragrance was!" She will be so taken by your flattery that she will forget to be angry at your snooping around. Days later, after you are finished with the ring and have completed your mission, on another visit to her house, replace the ring in its original location. The Pepto-Bismol scenario might not work again, so be prepared for another brilliantly concocted plan.

There are many things to consider when choosing an engagement ring. Consider carat weight if you are going for a diamond (as Marilyn Monroe stated, "Diamonds are a girl's best friend). After that, determine the clarity. Make sure the diamond reflects light and does not have any major imperfections. Next, think of the color you want. Make sure it doesn't clash with the gold or silver jewelry she wears. She will still wear it for you, but you know how unhappy women get when they can't be color-coordinated. Finally, choose a setting for the ring. Keep in mind whether you fiancée uses her hands a lot, as you would want to get a shorter wedding band so it doesn't get in the way.

Once you have finally bought the ring, you should feel good about yourself. Your wallet may be lighter and your bank account emptier, but the mere look of happiness on your soon-to-be bride's face will certainly make up for it.