rarity

noun
1
a person or thing that is unusual and is therefore often valuable or interesting
کمیابی, نایابی, ندرت, شیء نادر, نادر, یگانه, استثنایی, بی‌نظیر
2
the quality of being rare
کمیابی, ندرت, نایابی
The value of antiques will depend on their condition and rarity.
Items like this have a certain rarity value.