First you must have themed the wedding , from the style of traditional, royal, Rajasthani, beach wedding, to formal wedding so you must also plan your clothes in accordance with that as well as your accessories and jewellery.
Best Accessories & Jewellery for Indian Groom
Groom Long Kundan Mala
A long kundan mala can be worn for your sangeet, wedding or reception over a simple indo western or dhoti sherwani or a long sherwani. The sherwani not heaving much embellishment is a better choice to style the mala up.
Groom Pearl Mala
Add pearl mala which has a group of three strands or four over a sherwani jacket, short or normal. Occasions can be as wedding, reception or sangeet.
Groom Sherwani Brooch
A nice sherwani brooch which comes on the chest pocket side or by the placket can be added to any sherwani to add more glam.
Wearing a kada a plain kada that men do is a great choice for traditional and royal or Rajasthani weddings and it does look attractive.
Groom Wrist Watches
In one wrist do wear a watch in metal of course, avoid the belts during these occasions. From formal weddings to Traditional you need to wear a stylish watch.
Carrying a sword maybe a tradition of Punjabi wedding, Rajasthani wedding, Sikh wedding so that will add the royal look to any groom.
Indian Groom boutonniere
Do wear a boutonniere which matches your wedding theme on your coat suits during the wedding ceremony, and do wear it for a beach wedding even if you have planned to go with the waistcoat look, add it to your waistcoat chest pocket.