Description
Tanzanite occupies a singular position in the collector’s lexicon — found in a single valley at the foot of Mount Kilimanjaro, its supply is finite in a way that few gemstones can claim. This 0.93-carat specimen exhibits the characteristic trichroic play that defines the finest examples of the variety: shifting between velvety violet-blue and soft burgundy depending on the axis of observation. At just under a carat, it sits in a weight class that balances meaningful saturation with accessibility, making it a considered choice for both setting and long-term acquisition.
Frequently Asked Questions
What gives tanzanite its distinctive colour, and how does it change under different lighting?
Tanzanite is a blue-violet variety of the mineral zoisite, and its colour arises from trace amounts of vanadium within the crystal structure. It is strongly trichroic, meaning it transmits three distinct colours — blue, violet, and burgundy — along its three optical axes. Under incandescent light, the stone typically shifts toward a warmer violet-red, while daylight and fluorescent sources draw out the deeper blue-violet tones that collectors prize most.
How does a 0.93-carat tanzanite compare in terms of colour saturation to larger stones?
Colour saturation in tanzanite is closely tied to cutting depth and carat weight — stones below one carat can sometimes appear lighter in tone if the pavilion is too shallow. A well-cut 0.93-carat stone, however, can achieve excellent saturation when the lapidary has optimised the depth to concentrate colour through the table. This particular weight is often favoured for solitaire jewellery settings where the proportions allow the trichroism to remain fully visible to the eye.
What certifications should a collector look for when acquiring tanzanite?
Reputable third-party laboratory reports from institutions such as the Gemmological Institute of America (GIA) or the American Gemological Laboratories (AGL) provide authoritative documentation of a stone’s natural origin, colour grade, and any treatments. For tanzanite specifically, heat treatment to enhance blue-violet saturation is industry-standard and not considered a negative factor, but a certificate confirming the nature and extent of any treatment is essential for transparency. Provenance documentation linking the stone to Tanzanian origin adds further value for serious collectors.
How should tanzanite be cared for to preserve its colour and integrity over time?
Tanzanite rates 6 to 7 on the Mohs hardness scale, which places it in a category requiring more attentive handling than sapphire or ruby. It should be cleaned with warm water and a mild soap using a soft brush, and ultrasonic or steam cleaners should be avoided as thermal shock and vibration can stress the crystal. When storing, keeping tanzanite separate from harder gemstones prevents surface abrasion, and removing jewellery set with tanzanite during physical activity is a sensible precaution for long-term preservation.
1.16 cts Tanzanite
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