The Diamond Spirit Guide is one of the oldest number-based methods of divination and perhaps the most powerful tool numerology has to offer. It reveals the chain of cause and effect that connects your physical and non-physical planes. It tells us how your experiences, choices, and priorities in the physical world affect your internal/spiritual growth, and how, in return, this affects the quality of your life on the physical plane. 

An incomplete, rudimentary version of the Diamond was brought back from obscurity by the late Kevin Quinn Avery and later completed and re-birthed by Hans Decoz. 

Each Diamond pattern consists of four numbers. The first is called the Challenge. Your Challenge is a lesson or test that, once learned, will benefit you for the rest of your life. 

The second number is the Root or Cause and explains the underlying reason that lesson has emerged. The third number, the Recommended Action (also called Action Key), gives advice on the best approach for a successful outcome. The final number - aptly named the Outcome - reveals what the likely result of your efforts will be, and how it might affect your future.

Except for ages 0 through 7 and 75 through 81 we experience two Diamonds per year from birthday to birthday. These two Diamonds overlap and are equally important; they fit together as if working on one helps us understand the other. 

Although most Diamonds are in place only for one year, it's not uncommon for one or both Diamonds to repeat the following year. Often one number - usually the Challenge number - lasts for more than one year, while the other three numbers change. Finally, a number that is the Cause one year becomes the Action Key for the next. The Diamond's structure is complex but also logical and beautiful.

A word of advice: getting the most out of your Diamond requires some measure of self-reflection, not unlike the I Ching. I recommend that you read it more than once, then let it simmer. You may be surprised at the amount of insight you gain. 

Your report covers two years/ages from birthday to birthday. To avoid distraction, you may want to postpone reading the Diamonds for the second year until a couple of months before your next birthday, or if you do read them, go back to the two for your current age and focus on those. 