Mineral Specimens with Zoisite|
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Rarely do you find pristine gem tanzanite crystals, in this size, with such sharpness to them. High lustre is common enough, but the glassy finish, the top reflective lustre as you see here (note there are no areas where it does not reflect, showing a more matte surface), is uncommon. More rare is to find such crystals with a high gem value content AND naturally intense colors on all 3 axes, without being heat treated first. More rare yet - well, try finding TWO such fine crystals, each pristine, similar in size, and both with the top color intensity on all 3 axes - and stick them together. This shockingly 3-dimensional cluster is just such a beast: a cluster of two of the finest intense-colored natural tanzanite crystals I have seen. They are joined in such a manner as to maximize the 3-dimensional geometry of the specimen, spacing the crystal masses from each other to give the piece a maximal presence. Note in the side-by-side photo how the relational geometry between the two crystals is so dramatic in each axis, that the photos, shown alone, actually LOOK LIKE THEY ARE OF DIFFERENT SPECIMENS. This is an Iconic mineral specimen in every sense, memorable among a huge crowd of good things on the market, and should becaome one of the key pieces in a collection. PHOTOS BY JOSEPH BUDD. Comes with custom base for display. Illustrated, Rocks & Minerals article on dichroic minerals
This specimen is as jewel-like as you can get for an uncut tanzanite, with absolutely top glassy lustre, that looks polished, combined with a complex sharp termination and a rich natural color. This kind of clarity and perfection of form, combined with the freaky lustre and the color scheme here, has come out only in small amounts of crystals, generally of abou tthis size or smaller, from Block D in recent years. Admittedly, the material of this particular style is not the most intense blue, or purple, or red (on c-axis); but rather has more subtle pink/maroon coloring on the long axis and a lighter pastel hue of blue. It has not been heat-treated, which emphasizes and conforms the blue and purple hues to a standard , while squelching the natural red or pink color on the c-axis. It is pristine and complete all around, and displays like a Jewel in a showcase. This is , due to the lighter color palette, not the traditional "major" tanzanite of intense blue (and there, heat treated pieces are acceptable to me when disclosed as such), but rather a more rare and subtle crystal that to me is all the more desirable for its unique qualities. 32 grams
This is an intensely-colored crystal of natural hues, which run to deep purple (front) and deep blue (side) on the A and B axes. It is NOT heat treated to enhance and conform the colors to gem industry standard. This crystal has outstanding lustre, like glass; and a sharp, interesting, bifurcated termination. The sharp form looks like that of a slab of blue glass, it is so equant and even on its faces. The piece is complete all around except for a few slight dings and a contact on the back side. What is really unusual about the piece is that the red/maroon color on the c-axis actually slips over and shows from the front, when it is lit strongly. Thus, you see red in the bottom of the front face, which should otherwise be a pure purple. The intermixing of the colors is not a common event i ntanzanites, and here it is very pronounced. Combined with the sharp, interesting termination (most have just a simple point), the intense colors make this a showy piece, of good size, at a price that seemed to me relatively low compared to others on the market today (and in fact I amortised this down from the original price my own source considers me to have paid for it).
A stunning, totally gemmy crystal weighing in at 36.5cts of pure gem rough quality cutting material. This crystal is razor sharp and glassy. Interestingly, it is composed of two crystals in parallel growth, and so the termination is more appealing than the typical "singles" you might expect in a thumbnail example of this species.The blue color is a normal color saturation, and the purple is richer than usual , especially in a smaller crystal size. The piece exhibits a third color on the vertical axis, more pink-lavender than the deep red common in larger crystals. Still, this third color is present and marks it as natural and unheated. Joe Budd Photos
Few tanzanites show as much mixing of colors as this crystal does. By this , I refer to the fact that natural tanzanite is trichroic, viewed as blue or purple or red down each of the three axes of display. However, most tanzanites show discrete color, in which you must rotate the crystal a full 90 degrees to see the next color in line. This particular piece, which is also fabulously glassy and has a fat and geometric termination as a bonus, shows hints of its c-axis red color when viewed from the other angles. It is a squat, fat crystal at 50 grams, or 246.0cts . This came out in October of 2010. Because of the extreme color saturation, combined with high lustre, it is very difficult for the camera to focus on the core of the specimen so that you can see how gemmy it is , in person. Instead the camera is trying to focus on both the front and back faces at the same time, leading one to think this is transparent to translucent when in fact it is more like tranparency blue glass in person. The camera sees reflections off the clear back faces, bouncing back at the lens. However, it is actually almost entirely a true transparent crystal with more gemminess. The gem rough value of the specimen, in fact, is sizeable. I got it as a bargain, not cleaned fully, and hence the price per gram of this crystal with its intrinsic, high quality cutting rough, is a bit lower than normally would be the case if the previous owners had realized its potential to clean up. Do not let the relatively "reasonable" price fool you . I just got lucky - I could not easily replace this today, for any cost of my own in the near price range to what we are selling it for. Joe Budd Photos
A stunningly intense, deep blue crystal that is natural and unheated. The piece shows vivid blue, red, and purple colors along its three axes. The blue is particularly intense, especially when you consider how GEMMY the top is ; and how usually those two features do not go hand in hand. A fancy termination and top-percentile glassy lustre together, make this a superb large miniature. The crystal is 66 grams and contains a large amount of cutting rough in gem-clean regions. Although there are a few narrow veils in the gem portions, the piece still would cut three decent sized stones and some smaller stones, all of AAA unheated color. Thus, at the source even, we had to pay a price for this crystal based on its facet value. It was estimated that the cutting value of this crystal is nearly the specimen value being asked, making it a relative bargain as far as these go, based on this intrinsic value. I am a big believer in hoarding fine tanzanites, as the source just cannot last forever, and worldwide demand for the gemstone drives the miners to cut good crystals for the easy and quick monetary yield, as opposed to save them. This particular crystal was found in April of 2011, and came in a small pocket that yielded a number of pieces with this fancy, unusually complex termination which I find highly desirable. Comes with a custom lucite base for display. Joe Budd photos
A stunning, unusually elongated and vertical tanzanite crystal showing vivid gemminess , especially when stood up showing the purple side forward. For whatever reasons, I cannot explain, nearly all tanzanite crystals present at their best with the blue face forward, and the purple axis turned 90 degrees from display. It is just the way of things. But this piece really shows both the best drama and the best gemminess, with the purple facing the viewer. The blue color is equally intense, though, and no slouch on its own. When a light is shined up along the c-axis, bottom to top, the piece glows with a brilliant red-magenta color that is indicative of its natural coloration without treatment (treatment for the gem trade disrupts the third, red color from showing). What is amazing is that, despite the height, the light really transmits through nicely along the long c-axis and makes the whole piece glow, instead of just the tip. The crystal is pristine and complete all around, although it has a "slip contact" where one surface is rough in a few places, only on the very right hand edge, due to contact where it grew against another crystal. The piece is obviously very 3-dimensional as you can see, and reminds me of Transco tower in Houston. So overall this is a stunningly intense, deep blue crystal that is natural and unheated. The piece shows vivid blue, red, and purple colors along its three axes. At just over 100 grams mass, there is a sizeable amount of high-grade cutting rough here, where you could go right up the gemmy core of the piece and cut intense purple-oriented stones including two of substantial size. As I say elsewhere here, I am a big believer in hoarding fine tanzanites, as the source just cannot last forever, and worldwide demand for the gemstone drives the miners to cut good crystals for the easy and quick monetary yield, as opposed to save them. This particular crystal was found in the early 2000s and has been in a private collection since that time. Comes with a custom lucite base for display. Joe Budd photos
A strange combination piece featuring a 2-cm-long gem tanzanite impaling a giant, highly unusual, blue prehnite crystal. The prehnite is complete about 4/5 around, with only one break where it contacted attached matrix, on the back of the termination. This is a significant prehnite for the locale, and a unique crystal habit and style overall. The tanzanite is a nice accent, but the value here is in this crazy , interesting, prehnite with its unusual color and fat, tabular terminations. From a find of 2011.
From a strange pocket of October 2011, this showed up at the Munich show. It is a strong yellow colored zoite (still a "tanzanite" from this locality) with a small core of intense blue tanzanite at its base. The crystal is HOLLOW. It clearly grew around and covering something else, perhaps an anhydrite or calcite, that then dissolved away and left the tube running straight through to the termination. From the front, you do not see the tube, as the temrination is nicely steep and bevelled. from above, or below, though, you can look directly through the crystal as if it was a tube. A highly unusual specimen, and aesthetic in its own right as a yellow tanzanite with strong color. 23 grams (or just under 100 carats) in mass. Joe Budd Photos.
This is an intense purple-pink tanzanite crystal, which is a very rare and seldom seen natural color for tanzanite. The crystal is razor sharp and lustrous, and weights 38.9 carats. It is complete all around save for a small divot out of the back of the otherwise razorsharp termination (and hence is priced about half what it would, otherwise, but nevertheless is VERY impressive on display, and from front or sides). Joe Budd Photos.
Here we have a highly unusual PINK tanzanite, which is the rarest natural color for this deposit, it seems. The crystal is a total gem! It is sharp , pristine, and complete all around. It is 11.9 carats in weight. Joe Budd Photos.
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