The full name of the
Sutra in Sanskrit is Vajracchedika Prajnaparamita Sutra.
The Diamond Sutra is the most popular Sutra of the Prajnaparaamita
scripts, probably next to The Heart Sutra. Please note that the
latter is just an extract from a chapter of the Mahaprajnaparamita
Sutra. The Diamond Sutra is one of the principal texts amongst
Ch'an schools in China.
The Sutra illustrates
in details the concept of emptiness that everything exists, without
exception, in this phenomenal world has no real substance by itself.
This characteristic is known as 'no-self'. The word 'diamond'
is used to describe the durability and firmness.