Birthstones by Month September: A Calm Month of Equilibrium and Introspection Crispy air, colorful foliage, and birthstones by month September herald the change from summer's warmth to autumn's cool embrace. September is a tranquil month of balance and reflection. The days slowly get shorter throughout this serene and collected month, which encourages new ideas and ideas. For those born in this month, the palette of nature encourages artistic aspirations and fresh starts, and they envision a canvas to be painted with rich tones of orange and gold. Routines are being reset, schools are reopened, and the world seems to be pulsing with the energy of new possibilities and ideas.