Each gem has a unique description about what it represents:
Amethyst: Amethyst channels clarity and insightfulness, a favourite amongst those who wish to enlighten their minds.
Topaz: Topaz channels purpose and nobility, and is recorded to be integral in ancient ceremonies of knightly duty.
Sapphire: Sapphire channels grievances and the flow of time. And as it may enhance these sorrows, it too can aid in letting them go.
Emerald: Emerald channels wealth and power, owing to it's rumored usage as a currency in faraway, forgotten lands.
Ruby: Ruby channels passion and zest, thus aiding in successful castings of the most intense rituals.
Diamond: Diamond channels brilliance and purity, and is sought by those who wish to excel in all aspects of life.