Frequently Asked Questions. FAQ
Introduction
You have seen the raw tanzanite pendants. You understand they are unheated, single-origin, and trichroic. But questions remain: Can I wear it daily? Will the color fade? Is a raw crystal as durable as a faceted stone?
These are the right questions. Here are honest answers grounded in crystal science and collector experience.
1. Is an unheated tanzanite pendant durable enough for daily wear?
Yes, with one qualification. Tanzanite ranks 6.5 to 7 on the Mohs hardness scale. This is slightly softer than sapphire (9) or diamond (10), but comparable to quartz and amethyst. For pendant wear -- where the stone is not subjected to impact or abrasion -- hardness is not a limiting factor.
The structural integrity of an unheated raw crystal is actually superior to a faceted stone for pendant use. The full crystal mass distributes setting pressure across natural cleavage planes, and the absence of thermal stress fractures means no latent structural weaknesses from heat treatment. A well-set unheated tanzanite pendant worn on a chain is perfectly suitable for regular wear.
2. Will the trichroic color change or fade over time?
No. Trichroism is a structural property of the crystal lattice, not a surface coating or treatment. The three-color display (blue, violet, red-brown) will remain unchanged for the life of the stone.
The only color shift you may notice is optical, not chemical: an unheated tanzanite pendant can appear more blue in daylight and more violet or amber under incandescent or warm LED light. This is the natural pleochroic effect at work, and collectors prize it. It is not fading.
3. How does a raw crystal compare structurally to a faceted stone?
A raw unheated crystal keeps 100 percent of its original mass, including the dense natural termination faces that are the stone's strongest zones. A faceted stone loses 50 to 70 percent of its mass during cutting, and its facet junctions are stress concentration points where chips can originate.
The raw crystal's internal lattice has never been heated, so it contains no thermal stress fractures. The faceted stone has almost certainly been heated (95 percent of commercial tanzanite is treated), introducing microscopic stress around inclusion boundaries.
4. What setting styles work best for unheated tanzanite?
Raw tanzanite pendants are typically set in bezel or prong settings that secure the crystal at its natural base without clamping the crystal faces. A good setting respects the stone's natural geometry -- it does not force the crystal into a standardized mounting meant for a cut stone.
Merelani Untamed pendants are custom-set around each individual crystal's shape, ensuring the setting grips the stone's strongest structural zones.
5. Can the stone be cleaned normally?
Yes. Warm water, mild soap, and a soft cloth are all you need. Avoid ultrasonic cleaners and steam cleaners, which can subject the stone to vibration or thermal shock that natural crystals were not designed to withstand. Unlike heat-treated stones, which have already survived one thermal cycle, unheated crystals have never been stressed by temperature extremes and should not be subjected to them in cleaning.
6. Does an unheated pendant look as brilliant as a faceted one?
"Brilliance" means different things in different contexts. A faceted stone is cut to maximize light return through mathematically optimized angles. It reflects light like a mirror -- brilliant but uniform.
An unheated raw tanzanite pendant offers a different kind of beauty. Instead of uniform sparkle, it displays depth, color zoning, and pleochroic shifts that change as you move. The brilliance is internal and layered. For collectors, natural optical complexity far outweighs the predictable reflection of a cut stone.
7. What documentation should I expect with an unheated tanzanite pendant?
Every authentic unheated tanzanite pendant should include:
- A certificate confirming no heat treatment
- Single-origin documentation tracing the crystal to the Merelani Hills
- Carat weight and crystal dimensions
- Photographic record of the specific stone
Merelani Untamed provides full documentation with every pendant, including certification that the stone is unheated and sourced directly from the Merelani deposit.
The Bottom Line
An unheated tanzanite pendant is structurally sound for regular wear, optically complete with its full trichroic spectrum, and backed by provenance documentation that faceted commercial stones cannot match. The only question is whether you value natural authenticity above commercial uniformity.