Banded Jewel Beetle

Your observation, Sukanya, may be a new discovery. Usually, entomologists are not botanists at same time. They see a beetle on a "leaf", grab it, kill it - and loose the opportunity to know more about it as a part of nature. In Jewel beetles (and most other groups), as a rule you find that larvae that develop in living (or very freshly dead) plant tissues are host-specific - most frequently, on genus- or family level of plants. To know about these relations may help a lot in IDing observations, finding, and monitoring species. It is definitely a field for citizen naturalists - new discoveries for science highly probable not far away :-)

It is feeding, stuff underneath is poop. If a Buprestid is observed feeding leaves, you may assume the plant also is the larval host. Your beetle strongly resembles the species Coraebus rubi - which occurs in Europe, middle East and "east palearctic zone". If this includes India? - I guess not. C. rubi, in Europe, is strictly bound on Raspberry and allies. Jasminum is unrelated, I assume your beetle is not C.rubi.