Rarest

Blood is a juice of rarest quality.

Iridium is one of the rarest elements.

"To live is the rarest thing in the world. Most people exist, that is all."

Rhodium is the rarest metal.

The Saharan cheetah is perhaps the rarest cat in Algeria.

One of the rarest abilities is that of being able to recognise talent.

A blue diamond, one of the rarest gems in the world, was sold for almost $8 million. That makes it the most expensive gemstone in the world, per carat, sold at an auction.

A childhood without books: that would not be a childhood. It would amount to being shut out from a delightful landscape where one could discover the rarest of all joys.

Yet despite sounding inhospitable, grasslands such as this are home to a huge variety of smaller herbs and wildflowers, including some of the UK's rarest orchids and invertebrates, in addition to being home to butterfly species such as the Chalkhill Blue.