I have recently come across this wonderful Gregorian poem which lists the birthstones associated with each month. These are the most common birthstones in the English speaking world.
By her who in January was born
No gem save garnets shall be worn
They will ensure her constancy
True friendship and fidelity.
The February born shall find
Sincerity and peace of mind,
Freedom from passion and from care,
If they, the amethyst will wear.
Who in this world of ours their eyes,
In March first open shall be wise,
In days of peril firm and brave,
And wear a aquamarine to their grave.
She who from April dates her years,
Diamond shall wear, lest bitter tears
For vain repentance flow: this stone,
Emblem of innocence is known.
Who first beholds the light of day
In spring’s sweet, flower month of May
And wears an emerald all her life
Shall be a loved and happy wife.
Who comes with summer to this earth,
And owes to June her hour of birth,
With ring of pearl on her hand,
Can health, wealth, and long life command.
Ruby should adorn,
All those who in July are born,
For thus they’ll be exempt and free,
From love’s doubts and anxiety.
Wear a sardonyx or for thee,
No conjugal fidelity,
The August born without this stone,
`Tis said, must live unloved and lone.
A maiden born when autumn leaves
Are rustling in September’s breeze,
A sapphire on her brow should bind;
To bring her joy and peace of mind.
October’s child is born for woe,
And life’s vicissitudes must know,
But lay an opal on her breast,
And hope will lull those woes to rest.
Who first comes to this world below
In dreary November’s fog and snow,
Should prize the topaz amber hue,
Emblem of friends and lovers true.
If cold December gave you birth
The month of snow and ice and mirth
Place on your hand a turquoise blue;
Success will bless whate’er you do.