Answer
New York's state gemstone is the garnet. The garnet was designated as the state gemstone in 1969. The garnet chosen as the state gemstone of New York is the dark red variety known as the almandine garnet. New York has a rich geological history and is known for its diverse mineral deposits. Garnets are relatively abundant in certain areas of the state, particularly in the Adirondack Mountains and the Hudson River Valley. This abundance makes garnets a significant part of New York's mineral heritage.
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The question asked to describe a state's gemstone and why it was selected, each state will have unique gems and reasons.