What is Tanzanite?

In short: Tanzanite is a blue-violet gemstone found in only one mine in the world, at the foot of Mount Kilimanjaro in Tanzania. It is rarer than diamond and becomes rarer each year; when the mine is depleted, it will be gone.

As of: September 2026. By Phil Oberlaender, Corelune Jewellery, Düsseldorf.

What makes tanzanite so valuable?

• Only one mine worldwide, geologically unique
• Intense blue-violet with pleochroism (color change depending on the viewing angle)
• Rising prices for years, limited availability

Buying tanzanite

• Always buy with a GRS certificate
• AAA quality: most intense blue-violet, largely inclusion-free
• Origin: Tanzania/Mererani

Tanzanite with certificate: from the Corelune collection.

Related: Buying tanzanite jewelry: The rare stone from only one mine in the world.

What is ordered most frequently

Which material is best for everyday use?

What should you pay attention to when buying jewelry?

The question of material comes first and determines almost everything else. Stainless steel retains its color and shape for years, handles water well, and is priced for everyday wear. The trade-off is that there is no intrinsic material value.

Sterling silver looks valuable but requires maintenance because it tarnishes. Gold-plated brass has the warmest initial tone, but the plating wears off first where there is friction: inside of rings and clasps.

How well a piece holds up is shown by its workmanship. Three points are enough for an assessment: solder joints, clasp mechanisms, and eyelets.

Fashion jewelry honestly classified: made for wearing, not as an investment. For substance over decades, you need solid gold and a different budget. For a piece that handles water and everyday life, this category is a good fit.

What is part of the routine for jewelry?

With jewelry, maintenance is especially worthwhile in areas you cannot see. Store in a dry, dark, and separate place, never permanently in the bathroom. What cannot be removed this way is usually abrasion, not dirt.

How can you tell if jewelry will last a long time?

Between two visually identical pieces, the difference almost always lies in the workmanship, not the material. A matte or uneven surface in certain spots indicates uneven finishing. If one of these points fails, the rest is secondary, because the piece will break exactly there first.

What is a realistic price for jewelry?

The question is less about what a piece costs, but how often you will wear it. In the range up to twenty euros, simple individual pieces are common; above that, the workmanship becomes finer and the selection larger. Money is well invested where you put the piece on without a second thought.

When does wearing jewelry cause damage?

The question is rarely whether the material can withstand water, but whether tension and friction are involved. For glued stones, hot water and ultrasound are the two real risks. Those who rarely take the piece off anyway should make an exception before sleeping.

Which combinations work with jewelry?

If you feel unsure, start with two pieces in the same color and add more later. Two pieces need a clear difference in size or length, otherwise they compete with each other. If you stick to one color family, you can expand at any time.

What mistakes happen when buying jewelry?

With jewelry, a wrong choice rarely costs a lot of money, but it repeats if the cause remains unclear. Often, one's own existing jewelry is ignored, so the new piece does not match anything already there. Those who base their choices on what they already wear are much more often right.

How to avoid sizing errors with jewelry

Measuring takes less than a minute and saves you the return. Note the result, because you will save the whole process on your next purchase. Everything else is a matter of taste and can be easily corrected.

What happens to jewelry after years

Over the years, less changes than many expect, and other things faster than assumed. Plated parts show abrasion first at edges, clasps, and inner sides, usually after one to three years of daily wear. Knowing this, you make a more appropriate material decision from the start.

Materials, measurements, and prices at a glance

Showering, swimming, and sports do not harm stainless steel; it does not tarnish. For reference, the values from the Corelune range.

Frequently asked questions

What care does stainless steel jewelry really need?

Lukewarm soapy water and a soft cloth are the safe method.

Does stainless steel tarnish like silver?

Compared to silver and gold-plated brass, stainless steel remains color-stable. However, colored coatings will wear off over the years at friction points.

Is fashion jewelry suitable as an investment?

No. That is the honest answer: the value lies in wearing it, not in the metal. Investing only works with solid gold.

Examples to which this applies: Stainless steel organic gold bangle and Stainless steel ring, 2.0g. Further bestsellers can be found in the our bestsellers category.

Is the bathroom suitable for storing jewelry?

Dark, dry, separate from each other. Damp rooms like the bathroom accelerate the process.

How can I see if jewelry lasts a long time?

Check the solder joints, the eyelets, and the clasp. If all three are clean, the workmanship is usually correct.

About the author

Phil Oberlaender runs Corelune Jewellery in Düsseldorf and has worked with stainless steel jewelry daily since 2024: quality control, complaints, everyday wear tests. The information in this article comes from his own range and from customer feedback. Where Corelune does not offer something, it is stated as such here.

Which categories fit this topic?

Specifically, it looks like this:

• Tarnish-resistant jewelry

Regarding price: 20% discount from two pieces, tiered up to 35% for five. We ship for free from 59 euros. Two pieces in the same metal color can be freely combined.

View tarnish-resistant jewelry at Corelune

At Corelune: Free shipping from €59, 14-day return, shipping from the Netherlands.

→ View waterproof jewelry at Corelune