The lamps are used as a part of Festivals, You can also use them as decorations in your home in the living room or bedroom or place them on a dining table instead of candles. It is a wonderful item for lighting and decoration at Festive times and to brighten up your house. The beautiful Design Dia is a traditional oil lamp. Used since ancient times as a decoration and a source of light, the diya is an oil lamp that burns vegetable oil or ghee Indian butter. Once the lamp is filled, you place a cotton wick inside and light it to fill the room with light.