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Welcome to the tanzanite shop

Diamond Education

Learn about Diamond
Know more about Diamond! If you are concerned about getting true value for your money, know what you are getting.

At The Tanzanite Shop, we offer a large variety of high quality diamond shapes and sizes. Diamonds are the world’s most exquisite gemstone and the hardest substance known to man. When mined and properly cut, their magnificent display of light and colors creates a fiery brilliance that has become the perfect symbol of love between two people.

To view the list of available diamonds, please click on the Select Your Diamond image to the right. If you have specific questions regarding diamonds, or would like to schedule an appointment, please contact us at Tel: 212-380-1666, 718-608-6079 or via email

To view the list of available diamonds, please click on the Select Your Diamond image to the right. If you have specific questions regarding diamonds, or would like to schedule an appointment, please contact us at Tel: 212-380-1666, 718-608-6079 or via email
Let our experts help you buy the perfect Ring. Whatever the occasion we'll help you Ring it in!

Drops, hoops or studs? Our Earring guide will help you home in the right pair.

The complete guide to buying and wearing Pendants.

What is blue diamond?
A blue diamond is a diamond that is bluish in color. Blue Diamonds contain an impurity that consists of the metalloid element boron. The boron is what causes blue and gray colored diamonds.
Blue diamonds can occur naturally. They are very, very rare. Several of our jewelry items use natural, mined Diamonds that have been irradiated and/or heated to induce their fancy blue color. This is a permanent process. It can usually only be detected as a surface enhancement and reads differently under a spectroscope than very rare natural blue diamonds. Many of the blue Diamonds seen in the jewelry business are enhanced or color treated. Their sparkle and brilliance is amazing! They are gorgeous in person and look like no other blue gem you have ever seen!
What is Champagne Diamond?
Champagne Diamonds are light-brown diamonds whose color is created by one of the most common issues found with clear Diamonds, too many mineral contaminants. However, with Champagne Diamonds, the minerals combine in such a way that they create a sparkling brown hue.

The formation of natural color Diamonds requires unimaginable heat and pressure exerted on the carbon crystals in rocks, and the presence of trace elements in the crystal’s lattice structure. Tremendous heat and pressure on a Diamond deep in the earth can abnormally compress and distort its structure, creating red, pink, purple or brown stones. If nitrogen, boron, hydrogen or another element interacts with carbon atoms during a Diamond’s creation, the Diamond’s color can change. Radiation during creation can also affect a Diamond’s color.
Anatomy of Diamond
Understanding the individual aspects will help you better understand the differences in diamonds.
The smooth, flat faces on the surface of a diamond. They allow light to both enter a diamond and reflect off its surface at different angles. This creates the wonderful iridescence for which diamonds are famous. A round brilliant has 58 facets (or 57 if there is no culet).
The width of the diamond measured through the girdle.
The outer edge or the widest part of the diamond. The girdle is the intersection of the crown and pavilion.
The bottom portion of the diamond from the girdle to the culet.
The facet at the tip of the diamond. It protects the tip of the pavilion from being chipped or damaged. Most shapes have no culet at all or a very small culet.
The top of the diamond and its largest facet.
The top portion of a diamond from the table to the girdle.
The height of a diamond from table to culet. The depth is measured in millimetres.
Crown Angle
The angle at which a diamond's bezel facets intersect the girdle plane. This gentle slope of the facets that surround the table is what helps to create the dispersion, or fire, in a diamond.
Table Percentage
The value that represents how the diameter of the table facet compares to the diameter of the entire diamond. For a round diamond, gemologists calculate table percentage by dividing the diameter of the table, which is measured in millimetres (this millimetre measurement does not appear on diamond grading reports) by the average girdle diameter. For a fancy shape diamond, table percentage is calculated by dividing the width of the table, at the widest part of the diamond, by the millimetre width of the entire stone.
Shape of a Diamond
Cut and shape are often confused. A diamond’s shape is the outward appearance of the stone. While there are hundreds of different diamond shapes, we have listed the most popular.
The round brilliant is the most popular diamond shape and is the only one with a cut grade recognized by all the laboratories such as the GIA and EGL. While diamond saws and jewelry lathes have enabled the development of Round shapes since around 1900, technology now allows for precise mathematical proportions to optimize the brilliance (the amount of white light reflected) and fire (flashes of spectral colors) of this shape. With 58 exactly placed facets, the round brilliant diamond produces the ultimate in luster and beauty.
The Princess diamond is a relatively new shape having been created in the 1970s, and is one of the more popular fancy shapes. The princess combines the brilliance of a round diamond with an overall square or rectangular appearance. This allows it to emphasize a diamond’s fire rather than its luster. The top of the diamond is square and the overall shape is similar to that of a pyramid.
An emerald diamond is rectangular in shape. Its facets are arranged parallel to the girdle, this is known as the step or trap cut. An emerald cut creates a unique optical appearance providing a view into the diamond. Because sharp corners are points of weakness where a diamond may fracture, these stones often have their corners truncated with an octagonal outline. Both the pavilion and crown are comparatively shallow so step cut stones are usually not as bright or fiery as brilliant cut stones. Instead, they accentuate a diamond's clarity and color.
Named after its developers, Abraham and Joseph Asscher, this cut is basically a square emerald with a unique step cut and cropped corners. The Asscher was very popular in the 1920s, and is now regaining its popularity after being featured on the HBO Series, Sex and the City. Asscher has also recently been the diamond cut of choice for several celebrity engagement rings.
The standard marquise diamond contains 56 facets and is elongated with pointed ends. According to legend, it was inspired by the smile of the Marquise de Pompadour and created for France’s Louis XIV, who wanted a diamond to match it. The shape of a marquise diamond can maximize carat weight, creating a much larger-looking diamond. Additionally, the length of the marquise makes fingers appear long and slender.
The oval is a diamond shape that has become more popular over the last few decades. This is a great choice for those who desire the overall brilliance of a round brilliant cut, but seek a shape that is more unique.
This is a square shaped diamond with trimmed corners. The radiant is extremely versatile and can be set in many different ways. It is one of the less common fancy shapes, so is an alternate for those who want a square diamond such as the princess.
This shape provides the brilliance and fire of a round cut diamond, but with a more unique shape. The pear is also referred to as the teardrop because of its single point and rounded end.
TA heart-shaped diamond is a romantic choice for a variety of diamond jewelry. The heart cut diamond usually contains 59 facets and is considered a brilliant cut.
This fancy diamond shape has been around for more than a century, and usually resembles the shape of a pillow. It is sometimes referred to as a pillow cut. Typically, it is in the shape of a square or square-rectangle.

Cut of a Diamond
Many people confuse diamond cut with the shape. But cut is the metric used to evaluate the precision and quality of the overall cutting itself. Many consider cut the most important of the 4 C’s because a well-cut diamond, regardless of shape, has more fire and brilliance. Cut is also the most complex of the 4 C’s, not even the major labs agree on how to best measure the quality of a diamond’s cut. Diamond Cut usually takes into consideration Proportions, Symmetry and Polish. Light Performance or other tests can also be used to calculate the precision of the diamond cut.
When a diamond is cut to proper proportions, light is reflected from one facet to another and dispersed through the top of the stone.

Too Shallow:

If the diamond is cut too shallow, light escapes through the pavilion before it can be reflected.

Too Deep:
If the diamond is cut too deep, light escapes through the opposite side of the pavilion.
Small variations in symmetry include misalignment of facets or facets that fail to point correctly to the girdle. Symmetry is regarded as an indicator of the quality of a diamond's cut. it is graded as Excellent, Very Good, Good, Fair or Poor.
Polish influences how well light is able to pass through a diamond and is crucial to its brilliance. Diamonds with lower polish grades are less brilliant because they have microscopic polish lines that blur the surface of the diamond. These polish lines reduce the amount of light that enters or exits a diamond. Polish is graded as Excellent, Very Good, Good, Fair or Poor.
Color of a Diamond

Diamond color is graded according to the GIA Grading Scale and is based on the presence or absence of color in white diamonds, which never changes over time. Each color grade is based on a very small range. When a diamond is color graded it is compared using a set of master stones. Master stones are a set of real diamonds that display a range of known colors.

The color-grading scale ranges from D to Z, with D being the whitest stone available. It is also the rarest. Colors E and F have no detectable color to the naked eye and also fall into the Colorless category. Diamonds in the G to J color range have a hint of body color and are considered Near Colorless. The eye begins to detect traces of yellow in diamonds that are in the J to M range.

Exceptions are fancy colored diamonds. Certain colors such as red and pink are very rare and expensive.
Clarity of a Diamond
A diamond’s clarity is a measure of its flaws or impurities. These imperfections are referred to as inclusions, which can be located inside or on the surface of the stone. To determine a diamond’s clarity, it is viewed under 10 time’s magnification by a trained gemologist. Small inclusions do not impact a diamond’s beauty or endanger its durability.

Inclusion Rating
FL/IF (Internally Flawless):
No inclusions visible under 10x magnification.

VVS1/VVS2 (Very Very Slightly Included):

Very difficult to see inclusions under 10x magnification.

VS1/VS2 (Very Slightly Included):

Inclusions are not visible to the unaided eye. Difficult to see inclusions under 10x magnification.

SI1/SI2 (Slightly Included):

Inclusions are typically visible under 10 x magnifications. Some SI diamonds may have inclusions visible to the unaided eye.

I1-I3 (Included):

Diamonds with visible inclusions to the naked eye. These inclusions sometimes affect the stone’s durability and can be so numerous or large that they impact transparency and brilliance.

Carat Weight

A carat is a unit of measurement used to weigh a diamond. Fractions of a carat are referred to as “points” or fractions. A 50-point diamond weighs .5 carats or ½ a carat. Similarly, a 1-carat diamond weighs 100 points.

Weight does not always equal size or beauty. Poorly cut diamonds, regardless of size, can be dull and lifeless. Plus, diamonds of the same weight can be different sizes. If a diamond is cut too shallow it may have a larger diameter but a smaller depth, which will impair its brilliance. That’s why cut is so important.
There are a variety of gemological institutes that appraise diamonds and measure and certify loose diamonds and diamond jewelry. The Tanzanite Shop uses the following agencies for diamond certification:
Gemological Institute of America (GIA)
Founded in 1931 in Los Angeles, the GIA created and introduced the international grading system. Headquarters are still located in Los Angeles.

Download the GIA sample certification here.
European Gemological Laboratory (EGL)
EGL was originally opened in Antwerp in 1974, and now has laboratories in Antwerp, New York, Los Angeles, Johannesburg, Paris, London, Israel and Seoul.

Download the EGL sample certification here.