Swarovski offers a wide range of birthstone colors corresponding to each month of the year. These birthstone colors are used in their crystal products and jewelry. Here is a list of the Swarovski birthstone colors by month:

1. January - Siam (Dark Red)
2. February - Amethyst (Purple)
3. March - Aquamarine (Light Blue)
4. April - Clear Crystal
5. May - Emerald (Green)
6. June - Light Amethyst (Light Purple)
7. July - Ruby (Dark Red)
8. August - Peridot (Light Green)
9. September - Sapphire (Dark Blue)
10. October - Rose (Pink)
11. November - Topaz (Golden Yellow)
12. December - Blue Zircon (Bright Blue)