How to determine the carat value of tanzanite?

Exotic and very rare tanzanite, sometimes with a rich blue, sometimes with a bright purple hue, is found in a single place on Earth – not far from the majestic Mount Kilimanjaro. These gemstones are found much less frequently than diamonds. But in Ukraine jewelry made from natural tanzanites are also present. Tanzanite was discovered relatively recently, in 1967. Experts, using sophisticated equipment, discovered that the gemstone was not a “sapphire” as expected, but a striking variety of zoisite. The world-famous jewelry company Tiffany & Co, as part of its advertising campaign, named the mineral in honor of Tanzania, where it was first discovered. “Zoisite is the mineral name for a number of opaque and translucent varieties, of which only two are used as gemstones: the massive pink thulite and the brilliant apple-green zoisite (greyish-white, gray, yellowish-brown and greenish-gray are also found). Named after the Czechoslovakian baron Zoys von Edelstein, zoisite had never previously enjoyed popularity as a gemstone.” Since tanzanite is a pleochroic stone, meaning it has different shades depending on the trajectory of the eye, the stones combine blue and violet colors in a wide range of tones. Therefore, cut is a decisive element in the color scheme that the consumer sees in jewelry. rings with tanzanites, or on other decorations. Feature of raw natural tanzanite is that it usually has a brownish tint. Most minerals offered for sale today owe their color to heat treatment, which reveals the attractive pleochroic blue and purple color of the stone. Blue crystals originally discovered by the Maasai tribe in Tanzania were an exception because they were likely exposed to a natural heat source deep within the earth. However, now heat treatment has little effect on pricing. In 1978, a massive cholera epidemic hit northern Tanzania and interrupted production natural tanzanites, rubies, garnets, sapphires, tourmaline and chrysoprase. And since then, most of the known gem deposits have been depleted. All these circumstances have led to a shortage of quality gemstones and a rapid increase in their value.Mineral: Zoisite
Chemical composition: Ca2Al3 (SiO4) 3 (OH)
Color: violet-blue to bluish-violet to lilac-violet.
Refractive index: from 1,691 to 1,700
Birefringence: from 0,008 to 0,013
Specific gravity: 3,35
Mohs hardness: from 6 to 7 Tanzanite – the birthstone of December, along with zircon, turquoise and blue topaz. Merelani: There is only one source of tanzanite: the Merelani Hills in northern Tanzania. 1967: Maasai tribesman Ali Juayawat is credited with discovering the first tanzanite crystal. Processing: There are a number of processes used to change the color, apparent clarity, or increase the durability of gemstones. Synthetic analogues: Some gemstones have synthetic counterparts that have essentially the same chemical, physical and optical properties but are grown by humans in a laboratory. Imitations: Any gemstone can be imitated – sometimes using man-made materials or natural materials chosen by a person to imitate a particular stone. Why do we like this gem?

Pleochroism: Tanzanite is pleochroic, showing three different colors when viewed from different angles.
Single deposit: Tanzanite, mined in only one place, is rarer than diamond.
Color: Rich blue-violet shades of tanzanite of exceptional beauty.

The value of tanzanite is determined by evaluating the following characteristics.

Deep rich purple, blue or blue-violet are the most valuable colors of tanzanite. Lighter shades are more common.

Inclusions

Visible inclusions reduce the value of tanzanite, especially in lighter stones.

Cutting

Tanzanite is available in a wide range of shapes, but cushion and oval shapes are the most common.

Carat

The color of tanzanite is less intense in smaller sizes. For good color, gemstones must be larger than five carats.

Tanzanite Quality Factors: Tanzanite is a versatile gemstone that comes in a variety of sizes and cut styles. Although it was only discovered in the late 1960s, it quickly established itself as one of the finest gemstones in the world.

Tanzanite is a pleochroic stone, which means it can appear in different colors when viewed from different directions of the crystal. This makes the cut a critical element in determining the color that the consumer sees when the stone is cut and set into jewelry.

The rare color is an intense violet-blue with red flashes of pleochroic color coming from within the stone. Due to the gemstone’s strong pleochroism, sculpted examples typically show a combination of blue and violet colors in a wide range of tones. As with most colored gemstones, lighter colors are more accessible and affordable than rich colors.

Untreated tanzanite usually has a brownish tint. Most blue tanzanites for sale today owe their color to heat treatment, which reveals the attractive pleochroic blue and violet color of the stone. The blue crystals originally discovered by the Maasai tribe were an exception because they were likely at some point exposed to a natural heat source within the earth.

Since trade professionals assume that most tanzanite on the market is heated in some way, this has little effect on pricing. In many cases, gemological laboratories have difficulty determining whether tanzanite has been heated.

Inclusions:

Most tanzanite sold for jewelry has inclusions that can only be seen under magnification, so any visible inclusions will reduce the value of the mineral. Additionally, any inclusions that may create durability issues, such as cracks, will significantly reduce the value of the tanzanite.

Cut:

The cut plays an important role in displaying the color of tanzanite. Due to pleochroism—the ability to display different colors when viewed from different directions of the crystal—the direction of the cut determines the overall color of the stone.

Cutters take financial considerations into account when deciding how to process tanzanite. As with other gemstones, losing weight means losing profits. Cutting tanzanite to highlight the lilac-violet color usually requires less cost than cutting it to produce a violet-blue color. This is one of the reasons why violet-purple tanzanites are more abundant than examples with a stronger blue tint. But this decision must be balanced against the higher price per carat that the rarer violet-blue color can fetch. Essentially, the cutter is making a choice between a smaller blue gemstone and a larger purple one.

Carat:

Tanzanite is available in a wide variety of sizes, shapes and cut designs. The finest and deepest colors are usually over 5 carats. Smaller stones often have less intense color.

All products with tanzanites from Boutique TV have certificates

Go to the “Jewelry with tanzanites” section and choose rings, earrings, pendants with tanzanites in 925 sterling silver

Only natural, natural stones in the Fabulous store.
Each set comes in a branded gift box.
Secure delivery in person to your home or work.
View before payment – at the checkout hall or upon courier delivery.
Photos of stones as is, without embellishment.
The price is indicated for everything at once, and not per carat.
Detailed characteristics in the “Stone parameters” tab.

Will you try to find a two-carat tanzanite that will please the eye with its shade compared to much larger tanzanites? But we find it from time to time. That’s why we at Basnoslovno are so pleased to show you this 2,53-carat tanzanite. The most saturated shade for tanzanites is bright, predominantly blue and not too dark. What is called “like from block D”, meaning that if such ones are found anywhere, then in that part of the field, under the letter D.

Even taking into account heat treatment, there are very few such tanzanites relative to the total tanzanite production. According to the standards of the Gemological Institute of America (GIA), the color is vB 7/5.

VVS clarity, the cut is not Fabulous, but does not require deep recutting, the color is revealed, we are satisfied.

The stone is supplied with the original expert report from the Russian gemological laboratory, Gemological Center of Moscow State University, independent of us. See the scan among the photographs, the original will be given to the buyer along with the tanzanite.

Height (thickness) of this natural rich tanzanite: 5,64mm

Color	Blue
Carat weight	2,53
Country of origin	Tanzania
Size in millimeters	9 × 7
Stone hardness on the Mohs scale	6,5-7
Cut shape	oval
Cut quality	Good cut
Cleanliness	VVS (very pure)
Ennobling	Heat treatment (H – Heating)
Certificate	Already in stock

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