1 Jan. Garnet (X3Y2(SiO4)3)
2 Feb. Amethyst (SiO2)
3 Mar. Aquamarine (Be3Al2Si6O18)
4 Apr. Diamond (C)
5 Maj. Emerald (Be3Al2(SiO3)6::Cr)
6 Jun. Pearl
Moonstone (KAlSi3O8)
7 Jul. Ruby (Al2O3::Cr)
8 Aŭg. Peridot ((Mg, Fe)2SiO4)
9 Sep. Sapphire (Al2O3)
10 Okt. Opal (SiO2·nH2O)
Tourmaline (XY3Z6(T6O18)(BO3)3V3W)
11 Nov. Topaz (Al2SiO4(F,OH)2)
Citrine
12 Dec. Turquoise (CuAl6(PO4)4(OH)8·4H2O)
Blue Topaz
1 turquoise, 2 hematite, 3 chrysocolla, 4 tigers-eye, 5 quartz, 6 tourmaline, 7 carnelian, 8 pyrite, 9 sugilite, 10 malachite, 11 rose quartz, 12 snowflake obsidian, 13 ruby, 14 moss agate, 15 jasper, 16 amethyst, 17 lace agate & 18 lapis lazuli (Credit: Vikipedio)
[1] Jewelers of America Leaflet with modern birthstones
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