Tanzanite 1.01 cts

Tanzanite is trichroic, meaning it transmits three distinct colours — blue, violet, and burgundy — along its different crystal axes. The stone’s final appearance depends on how it is oriented and cut by the lapidary, with most faceted tanzanites emphasising the blue-to-violet axis. Under warm incandescent light, the violet component tends to intensify, while daylight or cool LED illumination brings the pure blue forward.

In tanzanite, pricing per carat increases notably at recognised weight thresholds, typically at one, two, and five carats. A stone just crossing the one-carat mark like this example offers the visual presence of a full-carat gem while sitting at a more accessible price point relative to larger commercial grades. For collectors building a first significant tanzanite piece, the one-carat range represents a practical entry into stones with genuine market recognition.

Tanzanite has a Mohs hardness of 6.5 to 7 and a distinct cleavage plane, making it more vulnerable to knocks and abrasion than sapphire or diamond. It is best suited to protective settings — bezels or halo designs — and should be reserved for occasional wear rather than daily use in rings. Cleaning should always be done with warm water and a soft brush; ultrasonic and steam cleaners carry a real risk of fracturing the stone.

Tanzanite’s single-source origin and the projected depletion of Merelani mining reserves within decades give it a credible scarcity argument that few coloured gemstones can match with such geological certainty. However, investment value is realised most reliably in stones with verifiable quality — a report from a recognised laboratory such as GIA or the Gübelin Gem Lab confirming colour grade, clarity, and the absence of treatment beyond standard heat will substantiate resale value considerably. Uncertified stones can still be excellent buys, but documentation becomes important the moment a stone changes hands.