What we gifted to the world....
Innivations of India which are under rated by the world.

Zero - Mathematics does not make sense without 0. Although it has no value, it plays a vital role in Arithmetic. He was a great mathematician and an ace astronomer.
@RekhaSharma1511

Ink - Ink made from various materials was first invented in India. This black pigment was used in writing manuscripts in ancient India. India ink was made by burning tar, pitch, bones. Carbon was the primary pigment of India ink.

Crucible steel-

High quality steel was produced in South India since ancient times. The tech used to manufacture it was later on called the crucible technique. wrought iron 1st put with glass and charcoal in a container and was heated till the metal melted and absorbed carbon

Dock-
India was the first nation to have a dock that dated back to 2400BCE. People belonging to the Harappa Civilization were the first to build a dock in Lothal. This proves their immense understanding of oceanology and marine engineering.

Diamonds-

Diamonds were first mined in India. Huge deposits of diamonds were found in Central India and it gradually developed as a precious stone. India till 18th century was the only country where diamonds were found and were later on exported to other countries.