Birthstones are gemstones that represent the twelve months of the year or the twelve zodiac signs. Gemstones here refer to polished minerals, organic matter, or rock, with beauty, rarity, and durability as their main features. This exhibition displays many gemstones, including the ores of the “big four” – diamond, ruby, sapphire, and emerald. Also featured are iridescent opal and “cat's eye” nephrite. Looking closely at these minerals, in addition to admiring your own birthstone, what other gems do you like?