Fiona Diamonds is an Indian brand specializing in natural diamonds, lab-grown diamonds, and moissanites. They are known for offering a variety of diamond jewelry, including rings, earrings, and pendants, with a focus on sustainability and affordability. Fiona Diamonds emphasizes ethical sourcing and aims to provide guilt-free luxury through their lab-grown diamond options, which are also promoted as being more uniform and potentially more beautiful than earth-mined diamonds.