The Queen Mary Pearl is a natural pearl, not a cultured one, and that distinction is the whole story. Natural pearls form without any human intervention, which makes a large, fine one extraordinarily rare. The Swiss Gemmological Institute (SSEF), one of the labs that has examined the most important natural pearls of the last century, including the Peregrina, the Marie-Antoinette pearl pendant, and the Ana Maria pearl, recently analysed this one.

The Queen Mary Pearl is a drop-shaped natural pearl of 41.5 carats (166 grains), with the fine luster expected of a stone of this calibre. 🦪 Its documented provenance traces it to Queen Mary (1867–1953), who built a remarkable collection of jewels over her lifetime and passed them to her only daughter. A pearl of this size, shape, and natural origin, with a verified royal history behind it, sits among the rarest objects in the gem world.