Offered is a natural London Blue Topaz from Marambaia, Minas Gerais, Brazil one of the most renowned and prestigious topaz producing regions in the world. The specimen is presented as a raw, uncut crystal, preserved in attractive collector condition. The stone displays a deep, elegant blue colour characteristic of the London Blue variety, with subtle natural colour zoning and good transparency for an unpolished crystal. Natural growth features and minor inclusions are visible, confirming its authenticity and natural origin. The crystal structure is well defined, retaining its original mineral surfaces without any artificial treatment or shaping. 27g/135Ct