Montepuez Ruby Mining Limitada (MRM) is a Mozambican company operating at the Montepuez ruby deposit located in the northeast of Mozambique in Cabo Delgado province. Covering approximately 33,600 hectares, it is believed to be one of the most significant recently discovered ruby deposit in the world.

MRM is 75% owned by Gemfields and 25% by Mwiriti, a Mozambican company. MRM aims to emulate the values of Gemfields and operate in a way that contributes positively to the national economy, while taking a leading role in modernising the coloured gemstone sector and building sustainable livelihoods for the communities around the mine.

MRM believes that coloured gemstones should be mined and marketed by championing three key values – transparency, legitimacy and integrity.