The quality of being scarce or rare; scarcity that can increase value or importance (applies to resources, collectibles, species, etc.).
この切手は発行部数が少くて希少性が高い。
This stamp was issued in small numbers and is highly rare.
希少性により価格が上下することがある。
Prices can fluctuate based on scarcity.
希少性の高い動植物は保護の対象になることが多い。
Plants and animals with high rarity are often subjects of protection.