month                       15th - 20th century                 us (1912)                        us (2013)           britain (2013)              hindu
0     january                                    garnet                    garnet                           garnet                   garnet      serpent stone
1    february               amethyst , hyacinth , pearl                  amethyst                         amethyst                 amethyst       chandrakanta
2       march                       heliotrope , jasper   heliotrope , aquamarine          aquamarine , heliotrope  aquamarine , heliotrope  gold siva - linga
3       april                        diamond , sapphire                   diamond                          diamond   diamond , rock crystal            diamond
4         may                           emerald , agate                   emerald                          emerald    emerald , chrysoprase            emerald
5        june            cat 's eye , turquoise , agate         pearl , moonstone  pearl , moonstone , alexandrite        pearl , moonstone              pearl
6        july                          turquoise , onyx                      ruby                             ruby         ruby , carnelian           sapphire
7      august  sardonyx , carnelian , moonstone , topaz        sardonyx , peridot                          peridot       peridot , sardonyx               ruby
8   september                                chrysolite                  sapphire                         sapphire  sapphire , lapis lazuli             zircon
9     october                         opal , aquamarine         opal , tourmaline                opal , tourmaline                     opal              coral
10   november                             topaz , pearl                     topaz                  topaz , citrine          topaz , citrine       cat 's - eye
11   december                         heliotrope , ruby  turquoise , lapis lazuli   turquoise , zircon , tanzanite    tanzanite , turquoise              topaz

Table as JSON:
{"month":{"0":"january","1":"february","2":"march","3":"april","4":"may","5":"june","6":"july","7":"august","8":"september","9":"october","10":"november","11":"december"},"15th - 20th century":{"0":"garnet","1":"amethyst , hyacinth , pearl","2":"heliotrope , jasper","3":"diamond , sapphire","4":"emerald , agate","5":"cat 's eye , turquoise , agate","6":"turquoise , onyx","7":"sardonyx , carnelian , moonstone , topaz","8":"chrysolite","9":"opal , aquamarine","10":"topaz , pearl","11":"heliotrope , ruby"},"us (1912)":{"0":"garnet","1":"amethyst","2":"heliotrope , aquamarine","3":"diamond","4":"emerald","5":"pearl , moonstone","6":"ruby","7":"sardonyx , peridot","8":"sapphire","9":"opal , tourmaline","10":"topaz","11":"turquoise , lapis lazuli"},"us (2013)":{"0":"garnet","1":"amethyst","2":"aquamarine , heliotrope","3":"diamond","4":"emerald","5":"pearl , moonstone , alexandrite","6":"ruby","7":"peridot","8":"sapphire","9":"opal , tourmaline","10":"topaz , citrine","11":"turquoise , zircon , tanzanite"},"britain (2013)":{"0":"garnet","1":"amethyst","2":"aquamarine , heliotrope","3":"diamond , rock crystal","4":"emerald , chrysoprase","5":"pearl , moonstone","6":"ruby , carnelian","7":"peridot , sardonyx","8":"sapphire , lapis lazuli","9":"opal","10":"topaz , citrine","11":"tanzanite , turquoise"},"hindu":{"0":"serpent stone","1":"chandrakanta","2":"gold siva - linga","3":"diamond","4":"emerald","5":"pearl","6":"sapphire","7":"ruby","8":"zircon","9":"coral","10":"cat 's - eye","11":"topaz"}}