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TN0353 : 4.95ct AAA+ Violet Blue Tanzanite – 12x10mm

HKD 5,678

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Loose Tanzanite Gemstone Certified Tanzanite
Tanzanite price per carat HKD 1,143

In stock

Certification service for gems that do not already have certificate or require additional certification from different lab. View Sample Certificates

All our items are 100% Natural Gemstones – no lab or synthetic.


Gem Specifications

SKU: TN0353 Category: Tags: , , ,
Gem Type Natural Tanzanite
Piece(s) 1
Weight (ct) 4.95
Shape Cushion
Treatment Heated
Clarity SI-1
Size (mm) 12.08 x 10.10 x 5.50
Origin Tanzania
Lab None
Cert no. None
Type Natural Tanzanite
Piece(s) 1
Weight (ct) 4.95
Shape Cushion
Treatment Heated
Clarity SI-1
Size (mm) 12.08 x 10.10 x 5.50
Origin Tanzania
Lab None
Cert no. None

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Color Scheme


Violet Blue

This color scheme is generated by the system using the colors from the product image.

*For Reference only

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TN0353 Gemstone Color Scheme

CLARITY UNDERSTANDING


Gemstone clarity scale

SI-1

Slight Inclusion (SI-1) Clarity: These inclusions are noticeable and can be seen with a naked eye.

Gemstone Shape


Gemstone Shape Chart

Cushion

This is the geometric shape for the gemstone. Some shapes has variations due to dimension.

GEMSTONE CUT TYPE


Gemstone Cut

Fine Step Cut

Cut to perfection to maintain high quality products in our inventory.

Transparent Pricing


Our Gemstones are cut & polished by the same craftsman who make gemstones luxury brands, but sold at a fraction of the price.

We avoid traditional 10x mark-ups by being 100% transparent in our pricing and offer mine-to-market business model.

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HKD 5,678

STAR LANKA PRICE

HKD 13,215

ESTIMATE RETAIL PRICE

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Gem Certification By


We provide gemstone certification service for all our gemstones and use only reputed labs for certification. Our partnered labs have been in the gem industry for very long time and we do not recommend any other lab that is not mentioned here for certification.

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TRADE NAME
Tanzanite Stone
Mineral : Zoisite
Mohs Hardness : 6.5
Refractive Index : 1.69 – 1.70
Specific Gravity : 3.10 – 3.38

VALUE


Tanzanite Stone has seen a rapid increase in popularity in the last few years. Its mineral name is Zoisite and is naturally reddish brown in color, it is through heat treatment that it achieves its beautiful blue to violet color.


INFORMATION


Tanzanite was discovered in 1967, at the foot of Mt. Kilimanjaro in Tanzania (which gave the stone its name). Tanzanite is a pleochroic gemstone, meaning it can appear to have different colors under different light. In natural light, the stone resembles Sapphire in color, however in fluorescent light, it is closer to Amethyst in color. They are naturally trichroic, meaning the show blue, red-violet and yellow-green colors depending on the light on its three crystal axes.

The blue to violet color is their most coveted property. It is rare to find a naturally blue stone in the rough, so most achieve their color through heat treatments. The stone is heated to 500-600 degrees Celsius for about half an hour.


Charecteristics : Zoisite Variety


Tanzanite is the most prized Zoisite, but not the only one. Here are some others worth mentioning:

  • Zoisite - Only blue to violet Zoisites are considered Tanzanite Stone. You can also find transparent zoisite and in a range of colors, like pink, yellow and brown.
  • Thulite - Thulite is the national gemstone for Norway. It is pink in color and translucent to opaque in clarity. They make excellent cabochons and faceted pieces are rare. Other names for this gemstone are Unionite and Rosaline.
  • Anyolite - Anyolite is a lapidary rock containing chrome-rich green zoisite, black Hornblende and some large but opaque Ruby. Expert cutters turn the stone into cabochons and carvings. It is also known as Ruby-in-Zoisite.
  • Synthetics - There are currently no known synthetic Tanzanite. However, simulants and imitations are known to exist.

Enhancements

It is safe to assume that all rich blue Tanzanite have been submitted to a stable heat treatment.


SOURCE


  • Tanzanite - As the name suggests, the sole source for Tanzanite is Tanzania. More specifically in the Merelani Hills, situated in the Lelatema Mountains.
  • Anyolite - Deep green crystals, colored by chromium and with Ruby crystals are found in Longido, Tanzania.
  • Thulite - United States: California; Nevada; North Carolina; Washington. Canada; Greenland; Japan; Norway.

CARE


Tanzanite Stone hardness rages from 6 to 7 on the Mohs scale. However, it has a tendency to cleave and is rather brittle, which is not ideal for daily wear. Tanzanite are best used in occasional pieces or behind protective settings. They should be cleaned with a soft brush, mild detergent, and warm water.

Stone Sizes & collectibles

  • Rough Tanzanite gemstone have been found weighing hundreds of carats and reaches the largest size of all Zoisite in faceted gems.
  • Smithsonian Institution (Washington, DC) houses a 122.7-carat blue Tanzanite and an 18.2-carat blue cat’s eye Tanzanite.
  • A private collector owns a 220-carat Tanzanite.