India has always been liberal in following any religion, culture and custom that her people follow. Every company which works in India should be respecting varied Indian culture.
In media or fashion world (Lakme/Revlon eg) I don't find a convincing reason why a woman should be unmarried in promoting their products/services. I think people should be bold, open and modern enough in accepting our Indian culture to persue any business staying in India. Even in Western culture, wearing wedding ring/ engagement ring is completely legal and comes under the standards set by any HR there.
After the long discussion that we saw here...these are the takeaways:
1. Wear a long mangalsutra which could be hidden. A high neck smart high neck skivvy can help. Even a scarf well pinned can help. (Urmila MAtondkar did this in picture )
2. Wear a designer mangalsutra which apparently does not look like one thus respecting your culture.
3. In case your employer cannot come up with a genuine/convincing reason of not wearing a mangalsutra then they cannot force you not to wear one. Check if they have mentioned in the offer letter. Else they need to give a revised one. If you are not convinced, then look out for another job, there are many.
4. We definitely see many female workers not wearing mangalsutra or any of their marriage symbols, this could be because they are ashamed of their marriage... [I know I might have hurt some]. But those who respect their marriage, can definitely chose to select any of the options given in above points. I don't think talking to husband and convincing him to allow his wife for not wearing the mangalsutra is a good option. This might lower down your respect infront of him.
Its upto individual how he/she tackles the work along with personal life. How can they convince the employer in their favour is upto them. There is always an option of saying NO at the right time.
If you do not agree to my comments, then please get up, arise else whole of India is in high risk zone and ready to sink in this world.
All the best and God bless in making your career and personal life a success.