Purpose of Liability Insurance

Dear Team,
I am running a Pvt Ltd Company with two directors and its basically involved in gold trading. We also perform monthly gold chit. Every month collect advance money from my customer, buy gold and store it in safety insured vault and deliver to my customer when the chit ends.
Some of my customers are feeling unsecured that what will happen if something happened to the company such as bankruptcy.
So I am planning to take liability insurance to boost my customer confidence (say D&O insurance)? Can any one say it is legal for the said purpose?