Table: birthstones
[['month', '15th - 20th century', 'us (1912)', 'us (2013)', 'britain (2013)', 'hindu'], ['january', 'garnet', 'garnet', 'garnet', 'garnet', 'serpent stone'], ['february', 'amethyst , hyacinth , pearl', 'amethyst', 'amethyst', 'amethyst', 'chandrakanta'], ['march', 'heliotrope , jasper', 'heliotrope , aquamarine', 'aquamarine , heliotrope', 'aquamarine , heliotrope', 'gold siva - linga'], ['april', 'diamond , sapphire', 'diamond', 'diamond', 'diamond , rock crystal', 'diamond'], ['may', 'emerald , agate', 'emerald', 'emerald', 'emerald , chrysoprase', 'emerald'], ['june', "cat 's eye , turquoise , agate", 'pearl , moonstone', 'pearl , moonstone , alexandrite', 'pearl , moonstone', 'pearl'], ['july', 'turquoise , onyx', 'ruby', 'ruby', 'ruby , carnelian', 'sapphire'], ['august', 'sardonyx , carnelian , moonstone , topaz', 'sardonyx , peridot', 'peridot', 'peridot , sardonyx', 'ruby'], ['september', 'chrysolite', 'sapphire', 'sapphire', 'sapphire , lapis lazuli', 'zircon'], ['october', 'opal , aquamarine', 'opal , tourmaline', 'opal , tourmaline', 'opal', 'coral'], ['november', 'topaz , pearl', 'topaz', 'topaz , citrine', 'topaz , citrine', "cat 's - eye"], ['december', 'heliotrope , ruby', 'turquoise , lapis lazuli', 'turquoise , zircon , tanzanite', 'tanzanite , turquoise', 'topaz']]
Statement: Garnet is considered the birthstone for January by every group except the Hindu
Statement: August had the largest amount of Birthstones through the 15th - 20th Century
Statement: Topaz has been associated as a birthstone with November and December
Statement: Us (1912) and Britain (2013) both consider Sardonyx and Peridot to be the Birthstones of August
Statement: 6 Birthstones have not changed Month in the united state from 1912 to 2013