Black pearls are very rare and therefore very valuable.

Plant breeding is always a numbers game.[…]The wild species we use are rich in genetic variation, and individual plants are highly heterozygous and do not breed true. In addition, we are looking for rare alleles, so the more plants we try, the better.

While many material components in Andromeda are familiar, we have also discovered rarer and more valuable materials; attributable to exposure to the Scourge, or mysterious alien technology.

Sees her reflection in a butcher shop.
She finds it all quite rare
That her meat's all vanity fair.

Most of the time, you do this by trading low-valued rares for more valuable ones or trading uncommons for rares. Other times it's trading cards that are in print for ones that are out of print, or low-value rares for good uncommons.

Frank pretended to rare back as if bedazzled, shielding his eyes with a forearm.

Here I have to say that I was walking along dark-hearted, my nose out of joint about Audie's notice of her, for just as quickly as my feelings kindled, my old envy rared.

Rare

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