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Home > SPECIALS > LOOSE GEMS > DISCOUNT TANZANITE > Quality Tanzanite Gemstone 4.12 carats

Quality Tanzanite Gemstone 4.12 carats

Tanzanite Gemstone 0.55 carats

Our Low Price: $233.75

Tanzanite Gemstone 0.57 carats

Our Low Price: $220.00

Tanzanite Gemstone 2.90 carats

Our Low Price: $1,348.50

Item #: TA4CA

Our Low Price: $1,390.00

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DESCRIPTION

ITEM DETAILS

OUR GUARANTEE

Gemstone Comments:

A truly stunning Tanzanite, perfect sized ring stone. Deep, intense color. A royal Burma blue color in daylight with hints of purple. Nice flashes of pink and red hints under the right incandescent light. Excellent proportions for an elegant ring. A must for platinum or white gold setting with top white diamond accents. USA cutting really brings out the fine luster and brilliance.

GemRate Colored Gemstone Scoring System
Was trademarked by AfricaGems.com was devised for a simple purpose, to give a potential gemstone buyer a snapshot of the quality of a colored gemstone based on an easily understood numeric score. Colored gemstones do not have the luxury of a standardized grading system like diamonds.

The GemRate system is based on the most important fundamental grading aspects of colored gemstones to determine value. At AfricaGems.com, the GemRate scoring systemis based on the evaluation of a gemstone by Marc Sarosi, an expert in the colored gemstone industry for 24 years. Marc has seen literally millions of gemstones and has graded hundreds of thousands of gemstones of all types. Marc's GemRate scores are impartial, fair and absolutely honest.

GemRate Score = Exceptional Gemstone

ColorColor: Very slight differences in color and hue can mean the difference between a priceless gem and a nice quality gem. Most gems can rarely be described with a single color. A ruby may display both pink and red hues with red being the dominant color. The most desirable combinations of color, color saturation and lack of zoning are what gem dealers look for. The finest of gems will have the perfect combination of these attributes and hence have the highest value.

Ratings:
9.0 - 10.0:	Ultimate color for this gem species.
8.0 - 8.9:	Very fine color for this species.
7.0 - 7.9:	Fine color for this species.
6.0 - 6.9:	Very good color for this species.
5.0 - 5.9:	Good color for this species.
4.0 - 4.9:	Moderately good color for this species, slightly over or under tone.
3.0 - 3.9:	Moderate color that is moderately under or over tone.
2.0 - 2.9:	Significant areas of gem are over or under tone.
1.0 - 1.9:	Most areas of gemstone are severely over or under tone.
0.0 - 0.9:	Entire gemstone is severely over or under saturated.

8.1

ClarityClarity: Is sometimes a difficult evaluation criteria. Emerald and rubelite tourmaline commonly contain inclusions. When evaluating these types of gems, clarity is not such a critical factor. However, inclusions should not affect the brilliance or appearance of the gem. When a gem dealer is evaluating a colored gemstone such as an emerald, the term eye clean is often used. "Eye clean" is used in the gem trade to describe a gemstone that has no eye visible inclusions when viewed at a distance of approximately one foot.

Ratings:
9.0 - 10.0:	Flawless when viewed under a 10x loupe.
8.0 - 8.9:	When viewed with a 10x gem loupe, 1 to 2 slight inclusions but no inclusions under the table.
7.0 - 7.9:	When viewed with a 10x gem loupe, 3-5 areas of slight to moderate inclusions.
6.0 - 6.9:	With the naked eye, no inclusions are present.
5.0 - 5.9:	Slight inclusions are present, but none under the table.
4.0 - 4.9:	Slight inclusions throughout the gem.
3.0 - 3.9:	Moderate inclusions are present and slightly detract from brilliance.
2.0 - 2.9:	Inclusions easily seen and moderately detract from brilliance.
1.0 - 1.9:	Inclusions easily seen and significantly detract from brilliance.
0.0 - 0.9:	Inclusions are so significant that gem has no brilliance.

9.2

BrillianceBrilliance: Refers to the interplay and reflectivity of light as light travels into a gemstone and is reflected back. An ideal cut diamond would have the highest brilliance grade. Colored gemstones typically contain inclusions, which can impact brilliance. A gemstone's shape & cut is also a factor in brilliance. Gem dealers and collectors will view a gemstone in as many lighting conditions as possible, even very low light conditions to see the gemstone's full range of brilliance.

Ratings:
9.0 - 10.0:	100% brilliance in any lighting condition.
8.0 - 8.9:	100% brilliance but not in low light conditions.
7.0 - 7.9:	Excellent brilliance in 80% of the gemstone.
6.0 - 6.9:	Excellent brilliance in 70% of the gemstone.
5.0 - 5.9:	Good brilliance in 60% of the gemstone.
4.0 - 4.9:	Moderate brilliance in 50% of gemstone.
3.0 - 3.9:	Moderate brilliance in 35% of gemstone.
2.0 - 2.9:	Some brilliance in 25% of the gemstone.
1.0 - 1.9:	Very little brilliance can be see anywhere.
0.0 - 0.9:	Void of any brilliance. Dull and lifeless.

8.5

IntensityIntensity: Intensity is the combination of the saturation and tone values of a gemstone. Saturation is defined as how strong or pure the color of a gemstone is. Tone refers to how dark or light the gemstone is. Intensity is also used to describe the color characteristics of a gemstone against other gemstones. The intensity grade is a very subjective grade, and like color, is in the eye of the beholder. Gem dealers and collectors have the experience to know if a gemstone displays the right intensity for that gem species.

Ratings:
9.0 - 10.0:	Full intensity-open vivid color.
8.0 - 8.9:	Full intensity-open rich color.
7.0 - 7.9:	High intensity-open strong color.
6.0 - 6.9:	High intensity of open medium strong color.
5.0 - 5.9:	Medium intensity of open medium color.
4.0 - 4.9:	Medium intensity of medium dark color.
3.0 - 3.9:	Low intensity of medium light color.
2.0 - 2.9:	Low intensity of darker color.
1.0 - 1.9:	Very low intensity of very dark color.
0.0 - 0.9:	Very low intensity of very light color.

7.2

Cut & FinishCut & Finish: Diamonds are typically cut to precise angles to maximize brilliance. In colored gemstones, a native cutter typically cuts to maximize weight. The result is a gemstone whose brilliance is moderate at best. Some lapidary artists, using precision lapidary equipment do cut colored gemstones with precision and quality. Other cutters, utilizing the gem peg method, can also produce gemstones that are exceptional in brilliance and proportions. Aspects to look for are; no windows, high brilliance, consistent facet pattern, well proportioned shape, appropriate girdle thickness and polish quality.

Ratings:
9.0 - 10.0:	Ideal cut with near perfect proportions.
8.0 - 8.9:	Excellent cut with excellent proportions.
7.0 - 7.9:	Excellent cut with very good proportions.
6.0 - 6.9:	Excellent cut with above average proportions.
5.0 - 5.9:	Good cut with above average proportions.
4.0 - 4.9:	Good cut with either window or heavy pavilion.
3.0 - 3.9:	Average cut with either window or heavy pavilion.
2.0 - 2.9:	Fair cut with average proportions.
1.0 - 1.9:	Fair cut with either window or heavy pavilion.
0.0 - 0.9:	Poor cut with poor proportions.

7.2

RarityRarity: Gemstones result from a multitude of rare combinations of physical conditions such as juxtaposition of unusual rock types, unique pressure and chemical processes, all working simultaneously. In a typical gemstone deposit, there are a very small percentage of the gemstones that are of gem quality. Among those gems of gem quality, an extremely small percentage of them are considered rare.

Ratings:
9.0 - 10.0:	Extremely rare, rarely if ever seen in the gem trade or collections.
8.0 - 8.9:	Very rare and very difficult to find in the open gem market.
7.0 - 7.9:	Scarce and not often seen in the gem market.
6.0 - 6.9:	Difficult to find in the open gem market in certain sizes and shapes.
5.0 - 5.9:	Somewhat difficult to find in the market but can be found with some selection.
4.0 - 4.9:	Limited availability in the gem market with limited selection.
3.0 - 3.9:	Limited availability in the gem market with some selection.
2.0 - 2.9:	Readily available in the gem market with somewhat limited selection.
1.0 - 1.9:	Abundant in the gem market- unlimited selection.

TreatmentTreatment: Some gemstones are routinely enhanced and accepted by the gemstone trade and consumer groups, such as heat treatment of Tanzanite and corundum. Gemstones that are typically enhanced such as corundum will have a higher value if there is no enhancement and accompanied by a certificate from a reputable laboratory. If the gemstone is new in the open market, it may not have a certificate and the dealer will usually guarantee the treatment status.

Ratings:
9.0 - 10.0:	No enhancement with certificate from tier 1 laboratory such as GRS, GIA, AGTA, AGL, Gubelin.
8.0 - 8.9:	Gemstones that are not treated (i.e. Garnet, Spinel, Peridot) and Permanent heat enhancement accepted in the gemstone trade (i.e. Tanzanite, Aquamarine, Tourmaline, and Corundum)
7.0 - 7.9:	No enhancement with dealer guarantee who cut from rough.
6.0 - 6.9:	No enhancement with dealer guarantee who bought cut gemstone.
5.0 - 5.9:	Emerald clarity enhancement by oiling, resins or Opticon.
4.0 - 4.9:	Enhancement by polymer/glass filling of cavities.
3.0 - 3.9:	Enhancement by gamma radiation.
2.0 - 2.9:	Enhancement by chemical diffusion process.
1.0 - 1.9:	Enhancement that is non permanent in nature.

7.8

IdentificationIdentification: The source of the gemstone�s origin can be a significant factor in evaluating a gemstones value. Gemstones from some localities sometimes have certain physical characteristics that positively identify them from that locality. A ruby of Burmese origin is worth more than an African ruby of similar quality and characteristics. It is important that any certificate of origin is from a gemological laboratory that is well known and established for certificates of origin.

Ratings:
9.0 - 10.0:	Certificate of origin from tier 1 laboratory.
8.0 - 8.9:	Origin guarantee from dealer who cut gemstone from rough bought at mine source.
7.0 - 7.9:	Certificate of origin from tier 2 laboratory.
6.0 - 6.9:	Speculative origin from dealer who bought gem rough from local source dealer.
5.0 - 5.9:	Origin guarantee from dealer who bought gem cut in country of origin.
4.0 - 4.9:	Origin guarantee from gem dealer who bought gem on open market.

6.9

Overall Score = 7.7

GemRate Scoring Definitions

Gemstone Details:

Price / carat:In gemstones and diamonds, the Price Per Carat refers to the dollar cost per unit of carats, the traditional unit of measurement for gemstones. 1 carat equals 0.2 grams. The price per carat is the best way to compare very similar gemstones in terms of quality. The higher price per carat reflects a higher quality gem.	$ 525 per carat	Make:This gemstone has a Very Good Make as graded by a professional gemologist. It has been crafted with the highest degree of craftsmanship, with very good proportions, symmetry and polish. It has been cut with little regard to the weight loss of the gemstone rough, and primarily to optimize the gemstones optical properties to its fullest potential.	Very Good
Dimensions:Dimensions are used to describe the size of a gemstone measured in millimeters. The measurements are described first by length, then by width and finally by the depth of the gemstone.	10.90x7.30x6.05 mm	Symmetry:This gemstone has Very Good Symmetry as graded by a professional gemologist and any symmetry flaws are extremely difficult to detect under 10x magnification. Gemstones with at least a Very Good symmetry and Make grade will display superior brilliance. The symmetry grade refers to alignment of the facets, poorly shaped facets or the presence of extra facets.	Very Good
Clarity:This gemstone was graded Eye Clean by a professional gemologist. Type I and Type II gemstones such as Aquamarine, Tanzanite, Yellow Chrysoberyl, most Tourmalines, Yellow Topaz Alexandrite, Peridot, Spessartites, Rhodolite, Ruby, Sapphire, Spinel, and Tsavorite, inclusions will not be visible with the naked eye. This gemstone will display superior brilliance. Type III gemstones such as Emerald, might show some slight eye visible inclusions with an Eye Clean clarity grade. This emerald will display superior brilliance compared to lower clarity grades.	Eye clean	Treatment:This loose gemstone has undergone heat treatment as determined by a professional gemologist using standard gemological testing. All gemstones offered by AfricaGems.com have full treatment disclosure.	Heat
Shape:Shape refers to the geometric shape of the gemstone. Traditional shapes are Oval, Pear, Marquise, Trillion, Cushion, Emerald, Round, Radiant, Princess. Other shapes are usually referred to as Fancy.	Oval	Identification:This gemstone is sold with a Dealer Guarantee and Letter of Certification issued by Marc Sarosi, gemstone expert and dealer for 24 years. The Letter of Certification describes the gemstone in full detail with all relevant gemological details noted	Dealer

AfricaGems Gemstone Buying Advantages:

• Guaranteed GradingEvery AfricaGems Gemstone comes with a either a professional gemological report issued by gemological laboratories such as GIA, GRS, AGL, AGTA, EGL, TGL, or a Letter of Certification issued by Marc Sarosi will be provided upon request only. AfricaGems guarantees all of our Letter of Certifications to provide accurate information. If you feel your AfricaGems.com Letter of Certification is not accurate, we will exchange or refund your purchase within 15 days from the date of purchase. At any time in the future, should the gemstone you purchased be graded by any of the following independent gemological laboratories (GIA, AGS, GRS, EGL, TGL) and the accuracy of the gemstone information disputed, we will exchange, refund or adjust the price of the AfricaGems Gemstone in question. Please inquire if you have any questions.	• 100% GuaranteedAs with all of our loose diamonds and gemstone jewelry items, your AfricaGems.com Gemstone is guaranteed 100%, no questions asked- with a full, complete refund with no hidden charges. We even cover the cost of return shipping and insurance!!
• Competitive PricingAll of our gemstone pricing is super competitive with similar quality gemstones sold elsewhere. We are always ready to meet or beat any other prices. With our superb customer service and 1% donation to charity, you will come out way ahead by purchasing your loose gemstone from AfricaGems	• Actual Gemstone ImageActually see the Gemstone in question! AfricaGems provides the ACTUAL image of the gemstone(s). We do not use stock gemstone images except in the case of our standard-calibrated gemstones which are grouped and carefully graded by A, AA, AAA or GEM grades in terms of color, cut, clarity.	• Generous 15 Day Return PeriodAfricaGems offers a generous 15 day return policy in order to give you ample time to have your Gemstone evaluated by a second party or gem lab. In circumstances warrant, additional evaluation time may be granted if needed.
• Fast Shipping After confirmation of your order, your Gemstone is quickly shipped by USPS, UPS or FedEx service, often the same day.	• 1% Donated To CharityAfricaGems donates a full 1% of GROSS Sales to the Zambian Childrens Fund, a non profit organization that helps orphaned Zambian children by housing, feeding, clothing and educating them. Rest assure that your purchase is helping in a small way to make the world a better place!	• Full Treatment DisclosureMany of the loose gemstones and diamonds for sale on various sales platforms such as the internet are sold without treatment disclosure. This is a violation of consumer trade laws! Treatment of gemstones and diamonds treatments have a significant effect on the value of these gems and diamonds. ALL gemstones and diamond sold on AfricaGems are sold with complete treatment disclosure. Guaranteed!

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