Labradorite: The Complete Guide

Labradorite is the showstopper of the feldspar family. Pick up a piece of labradorite and tilt it — suddenly the grey or dark surface explodes into metallic blues, greens, golds, and oranges that shift and move as the stone turns. This effect, called labradorescence, is one of the most dramatic optical phenomena in the gem world, and it makes labradorite one of the most visually impactful gems available at any price point. A well-chosen labradorite cabochon is a conversation stopper that clients rarely forget.

What Labradorite Is

Labradorite is a plagioclase feldspar (calcium sodium aluminium silicate) containing approximately 50-70% anorthite component. It belongs to the triclinic crystal system. The labradorescence is caused by light interference in alternating lamellar (thin layer) structures within the crystal — specifically layers of different feldspar compositions (calcic and sodic lamellae) that exsolved from the original homogeneous crystal as it cooled. These layers, typically 200-600 nanometres thick, create constructive and destructive interference of specific light wavelengths as the stone is tilted.

Labradorite has a Mohs hardness of 6-6.5 and two directions of cleavage related to the feldspar crystal structure. It is moderately durable — fine for pendants, earrings, and brooches; suitable for rings with protective settings but not ideal for daily-wear rings without care. It takes a good polish to a vitreous to sub-vitreous lustre on the main cleavage surfaces.

Quality and Spectrolite

The finest labradorite — called spectrolite — comes from the Ylamaa area of Finland and shows full-spectral labradorescence (all colours from violet through red) over a very dark body, creating extraordinary contrast and brilliance. Finnish spectrolite is the benchmark for the labradorite category and commands significant premiums over ordinary labradorite, which may show only blue-green or blue labradorescence against a lighter grey body.

Quality assessment focuses on the brightness and range of labradorescence (more colours and stronger brightness equals higher quality), the body colour (darker body provides better contrast), and the evenness and coverage of the labradorescent effect across the stone surface. Fine specimens show consistent colour across the entire face rather than isolated patches.

Golden Labradorite and Oregon Sunstone

Related feldspar gems include golden labradorite (bytownite) from Mexico, showing golden to yellow body colour with subtle schiller, and Oregon sunstone from Harney County, Oregon — a labradorite-bearing feldspar that shows a distinctive metallic sheen from copper platelets (aventurescence) and comes in clear to gem-quality colours including yellow, orange, green, and bicolour. Oregon sunstone is one of the few commercially significant gem deposits in the continental United States.

Rainbow Moonstone

Rainbow moonstone (sold commercially but technically a variety of labradorite or oligoclase feldspar) shows multicoloured labradorescence over a white to near-colourless body. It is one of the most popular commercial feldspar gems, widely used in boho and artisan jewellery. The multicolour play over a light body is visually distinct from true dark-body spectrolite and should be sold under its correct commercial name to avoid confusion with orthoclase moonstone.