Moms on Diwali occupy a specific social position that most gift-givers underestimate. She is both the person who organized the entire puja and the one everyone expects to look presentable for the family photos. The pressure is real. What she actually wants is something that signals she was thought of specifically, not just included in a bulk sweet distribution. A saree she chose herself would be ideal, but since you are buying without asking, lean toward wearables or kitchen tools she uses daily rather than decor she will politely display and forget.
At ₹3,000 to ₹5,000, you are in the range where the gift reads as deliberate. Below ₹2,000, you are in token territory and everyone knows it, including her. Above ₹6,000, you start entering territory where she will feel uncomfortable accepting it and quietly wonder what prompted the splurge. This band hits the sweet spot: a sterling silver pendant or a quality mixer grinder lands here, and neither feels like you were trying too hard or cutting corners.
The pitfall specific to gifting your mother on Diwali is gifting her something for the house and framing it as her gift. A new pressure cooker is a household purchase. A dry fruit hamper disappears into the family. If you are spending ₹3,000 to ₹5,000, make sure the gift is clearly for her and not for the kitchen shelf. She will notice the distinction, even if she does not say so.