The 2015 Stones Calendar includes a line illustration of the geometric structure of each of the twelve month's birthstones on corresponding shades of paper.

Each of the stone's properties – formula, crystal system, family, hardness, and lustre – are included, referenced from vintage field guides.
 

Stones Calendar

Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar
Chelsey Dyer – 2015 Stones Calendar