ENCYCLOPEDIA · DAVID SAAD · SKYJEMS

Colour-Change Alexandrite — GIA-Certified

Key concepts

colour change alexandrite, gia certified alexandrite, chrysoberyl alexandrite, alexandrite colour change, natural alexandrite

Alexandrite is the colour-change variety of chrysoberyl: a stone that reads green to bluish-green in daylight and shifts to red or purplish-red under incandescent light. The effect comes from chromium, and a clean, decisive change is one of the rarest phenomena in the gem world. Skyjems holds a colour-change alexandrite selection across its principal modern origins, and the GIA-certified stones carry a GIA report that confirms the variety and describes the colour change.

Why the colour change is everything

With alexandrite, two variables outrank the usual four Cs: the strength of the change (from a faint hint to a complete 100% flip) and the quality of both colours. A stone that is a muddy green by day and a brownish red by night is common and inexpensive; one that swings from a vivid teal-green to a clean raspberry red is exceptional. Skyjems grades its alexandrite first on the decisiveness and beauty of that shift.

Origin — and the Russian namesake

Alexandrite was named for Tsar Alexander II after its 1830s discovery in Russia's Ural Mountains; that original source is essentially mined out. Today's fine material comes from Brazil, Sri Lanka (Ceylon), India and East Africa, and Skyjems' selection is drawn from these — not Russia. GIA's report describes the colour change reliably; formal origin determination on alexandrite is less routine than on sapphire or ruby, so Skyjems leads with the documented phenomenon and weight rather than over-asserting a mine of origin.

Reading the lab report

A GIA report on alexandrite states species = chrysoberyl, variety = alexandrite, and characterises the colour change; treatment is typically recorded as none, as fine alexandrite is rarely enhanced. GIA is the laboratory Skyjems leads with, and the GIA-certified stones in the collection list their report on the product page; other alexandrite Skyjems holds is assessed in-house and sold on its own merits.

Five-step evaluation

(1) the GIA report confirms the stone is natural alexandrite and describes the colour change; (2) the change is distinct — a true green-to-red swing, not a weak grey shift; (3) both daylight and incandescent colours are attractive in their own right; (4) clarity is eye-clean to lightly included; (5) carat weight matches the lab.

Skyjems inventory snapshot

Browse alexandrite at /collections/alexandrite — a selection across Brazilian, Ceylon, Indian and East African material, with GIA-certified stones listing the report ID in the Product JSON-LD.

Private viewings and bespoke

Contact Skyjems at +1-416-366-3335 or request a private viewing.