Madagascar emerald is the chromium-coloured beryl mined from a series of schist-hosted deposits running through the eastern and south-eastern parts of the island, with Mananjary, Morafeno and the Ianapera district the most consistent producers. Madagascar is a respected but secondary source on the world stage, dwarfed in volume by Colombia, Zambia and Brazil but recognised for distinct material that surfaces regularly in the trade.

Geology and material

The Mananjary deposits sit within mica-schist and biotite-rich metamorphic units that resemble the Zambian Kafubu setting, and the resulting emeralds share a similar colour signature: a slightly bluish or yellowish green, often with fine to moderate clarity and saturated colour at small to medium sizes. Stones above three carats are uncommon; cleaner medium-sized goods enter the international trade alongside Zambian and Brazilian production.

Inclusion scenes are typical of metamorphic-schist emeralds: actinolite needles, biotite plates, mica flakes, two-phase inclusions and healed fissures. Refractive index falls in the standard beryl range, with iron content giving the stones a slightly higher specific gravity than Colombian material.

Treatment and trade

Like emerald from any source, Madagascan stones are routinely treated with cedar oil or an accepted clarity-enhancing resin to fill open fissures. Disclosure of treatment grade (none, minor, moderate, significant) follows Lab Manual Harmonisation Committee (LMHC) protocols. Origin determination is feasible at major laboratories using inclusion suite and trace-element chemistry, although separation from Zambian goods of similar character can require more than one technique.

The deposits have suffered from intermittent licensing disputes and informal mining over the years, which has limited consistent commercial supply, but Madagascan emerald remains a valid choice for buyers seeking a metamorphic emerald with traceable provenance and a price step below classic Zambian goods.