×Citrofortunella microcarpa

As I have the word “Mosambi” still ringing in my ears your postings remind me that even on this single name we have some work left to do. It is beginning to look like “Mosambi” is used in India as a general name for a number of Citrus fruits, a kind of generic name.
Usha di has correctly identified the fruit; it is a Variegated calamondin.There are several cultivars of this type. They all fall into the cultigroup Variegata. For simplification we will just call it the (Variegata group). So I would say the fruit in the pictures is likely to be: X Citrofortunella microcarpa (Bunge) Wijnands (Variegata Group) ‘Tiger‘
Please let me know if you know some other variegated cultivars. Calamondins are sometimes confused with round cumquats but have more in common with mandarines. They flower at the same time for instance (in spring) while cumquats flower in early summer (not sure how this works out in India, depends on the climatic region where the plant is grown). Calamondin looks like a miniature mandarin(e) with loose skin when ripe. Perhaps this explains why it is called “Mosambi”. I am told that although this fruit does not taste like much, a decent marmalade can be made with it. As the photos demonstrate it is an attractive ornamental plant.

Many thanks for confirming the id and extra information on my post.