Monteverde Gemstone Tanzanite Ink Bottle, Dark Purple - 30ml

Monteverde Gemstone Tanzanite Ink Bottle, Dark Purple - 30ml

The “Tanzanite” shade is part of Monteverde’s Gemstone Collection, a line of fountain?pen inks inspired by the rich colors of semiprecious gems. According to Monteverde’s own description:

“Traditionally used as a form of jewelry or other adornments, gems have always captured the eye … With this in mind the Gemstone Ink Collection is a line of brilliant fountain?pen inks that are rich in color and vibrancy.” 
This particular tone—tanzanite—is a dark purple / bluish?purple hue, meant to evoke the depth and richness of the gemstone tanzanite. The fact that it’s labelled “Dark Purple” in some listings suggests it aims to balance expressiveness with subtlety: one that is distinctive but still usable for writing, correspondence or journaling.

Technology & Performance Features

Like other inks in this range, this bottle is formulated with Monteverde’s proprietary Ink Treatment Formula (ITF™). From available references:

• It “drastically improves ink?flow quality, extends cap?off time, and lubricates and protects the ink feeding systems from corrosion or clogging.”

• The 30?ml glass bottle is sized for regular use and suited for fountain?pen filling.

• It's described as dye?based (rather than pigment) and not explicitly water?resistant, so it’s meant for regular everyday writing rather than archival or waterproof needs.

Because of the ITF treatment, users expect smoother flow, good compatibility even in pens that may run dry or have slower feed, and less risk of clogging when left uncapped for modest time periods (though one always must recap fountain pens promptly as best practice).

Colour impression: While I did not locate a large swatch review specifically for “Tanzanite” in the public product specs I found, from the listings it is a dark purple shade—rich and jewel?like. One reseller describes it simply as a “great purple shade” with “not too dark or light. A new favourite shade!”
From community commentary:

“Tanzanite is a lovely purple that has given me no issues.”
So the colour is fairly well regarded. It likely shows up in writing as a purple?violet tone, possibly with a bluish cast (as the gemstone tanzanite hints) depending on paper and nib width.

• Because of the ITF formula, expect good flow and less chance of skipping (especially in “dry” pens) compared to many standard inks.

• On quality paper (fountain?pen friendly, smooth, low absorbency) you should get clean lines, moderate drying time, nice saturation of colour.

• As with most dye?based non?waterproof inks, on poor quality or highly absorbent paper you might see feathering or show?through.

• The shade being dark but with richness means that it may perform well in both personal journaling and more formal correspondence (depending on how “purple” your workplace will accept).

• Aesthetics & uniqueness: The purple/blue?violet hue stands out from the usual “standard blue” or “black” inks. If you’re a fan of more expressive writing colours, this provides a sophisticated variation.

• Performance assurance: Because of the ITF treatment, there is added confidence that the ink will behave well in fountain pens—important if you alternate pens or use one infrequently.

• Bottle size & feel: 30?ml is a manageable bottle—big enough for plenty of use, small enough to make it accessible and less intimidating than gargantuan sizes. The glass bottle lends a premium feel.

• Collection merit: Being part of the Gemstone range adds collectible appeal. If you collect inks, this gives you both performance and thematic consistency.

• Not waterproof / archival: If you need ink that will survive water exposure, long?term document storage, or archival settings, this probably isn’t ideal (and the collection doesn’t emphasise water resistance).

• Paper quality matters: To get the best effect (saturation, smooth flow, colour richness) use decent paper. On low?grade paper the colour may appear less vibrant or you may see undesirable effects (feathering, bleed).

• Colour expectations: Purple can be subjective—depending on your nib size, paper, lighting, you may perceive the tanzanite tone as more violet, more blue?violet, or less vibrant. If you expect a very bright “true purple” it may appear more subdued on fine nibs or absorbent paper.

• Past quality?control caution: Some users of Monteverde inks in past years have reported issues (mould, contamination, smell) though these appear to be more sporadic. For example:

  “The purple is lovely! I know! …” 
  “Tanzanite is a lovely purple that has given me no issues.” 
  Nevertheless: it’s always good to inspect a new bottle when opening (smell, clarity of ink, cap seal) and to clean pens periodically.

• Shade subtlety: If you prefer very dark “blue?black” or extremely bold saturated colours, the “dark purple” may still be just moderate rather than ultra?deep; you might want to view swatches to confirm you like the specific tone.