GUIDE HAND BOOK ON
COMMON AND FANCY GEMSTONES
Eng. Gilay Charles Kilayi Shamika
Senior Professional Engineer & Gemologist, Tanzania Minerals Audit Agency-TMAA
Shamika/R&D/2014/JAN /Series NO.014
1.0 INTRODUCTION
The intention of the Guide Hand Book on Common and Fancy Gemstones is to help to
clear confusion of colored stones synonymous terms; fancy color and multicolor ranges
of certain colored stones. Once you miss the point of these terms, you miss the quality of
those gems and ultimately you miss the real value for money.
We all know fancy diamonds assume higher price than common diamonds
(colorless/white diamonds). Does this apply to all colored stones as well? That all fancy
colored stones assume higher prices than their corresponding common colored stones?
And how gemologically you can differentiate the fancy color and multicolor range
varieties of a certain colored/gemstones. Sapphire is blue but when occurs in other color,
it is called fancy sapphire. For instance Songea Orange sapphire this is fancy sapphire.
Tourmaline has all rainbow colors but in most cases it appears as green. Do those other
multicolor ranges of tourmaline which are not green called fancy tourmaline? The answer
is NO. This is the basis of confusion and the purpose of this guide book to clear that
knowledge gap.
Similarly, in the market, most businesspersons and valuation officials get confusion
sometime on differentiating fancy color and multicolor ranges to establish price. The
second confusion is all about the reference taken from diamonds where fancy diamonds
assume higher price compared to common diamonds (white/colorless) and use that
reference to refer to all colored stones: that all fancy colored stones must have higher
price as well than their corresponding common colored stones. This is generally wrong
but selectively right-because some of fancy colored stone assume higher price but some
not. Therefore generalizing is not right.
This guide hand book addresses the above complexity to drive the point on board and get
rid of those knowledge gaps. Because once you miss the point of fancy color, you miss the
value. Similarly, if you term the multicolor ranges as a fancy color and apply higher price,
once you are in the market for sell you will get lose as well because you will definitely be
told is not fancy is multicolor ranges with less value than that you bought before.
2.0 COMMON DIAMONDS AND GEMSTONES
A common diamonds and gemstones/colored stone means all diamonds and gemstones
with common or known colors. The common color for diamonds is colorless or white. For
gemstones referring to the Big Three Gemstones, common ones are; Ruby in Red color,
Sapphire in Blue color and Emerald in Green color. Each colored stone has its own master
color. When those gemstones/colored stones occur in their master colors, they are called
common colored stones. But when they occur in different color, it can be fancy color or
multicolor ranges.
2.1 Ancient Gemstones Groups
In ancient era the gemstones were categorized into four groups only. The central topic for
these groups was based on the hardness and popularity of those referred colored stones.
The hardness and popularity/favorites of Diamonds, Ruby, Sapphire and Emeralds
derived the earlier Gemologists to group and classify other gemstones in relation to these
gems.
Recently Diamonds were excluded from other colored stones and its Gemological courses
have been separated from colored stones as a full course of its own. The four groups were;
1. White Gemstones: All white colored stones were believed to be diamonds. Therefore
all stones with colorless or white color and tints were termed as Diamonds.
2. Red Gemstones: All red colored stones were grouped as Ruby since ruby occurs as
red.
3. Blue Gemstones: Sapphire appears as a blue stone and other stones with blue color
were all called sapphire as well.
4. Green Gemstones: Green colored stones in ancient era were all called emerald
referring to the color of Emerald.
2.2 FANCY DIAMONDS AND FANCY COLORED STONES
Fancy in common English language it means imagine, think, visualize or believe.
Something so immaculate that you dont imagine, think or believe can exist or be perfect
as it is before you.
The meaning is the same for diamond and other Gemstones that Fancy Diamond or
Fancy Colored stone is the one which occur with an imaginable/different color than the
one known color that is not expected or not common/familiar for the diamond or
colored stone to appear.
2.3 Fancy Diamonds
The common color for diamond is colorless or white. Many people know that diamonds
appear with colorless or white color. When diamond appears in that color
(colorless/white) is only called diamond.
After years of research and development of technology for diamonds and gemstones
identification, it came to be known that diamonds occur in other color than white or
colorless.
These diamonds which appear in different or unimaginable color other than white or
colorless are known as fancy diamonds. The diamonds with color of pink, blue, green,
black, yellow etc are called fancy diamonds. It is naturally expected diamonds to be white
or colorless and more than 98 per cent occur in that color. Other occurrences (fancy
colors) are only 2 per cent.
Due to this scarcity, the fancy diamonds assume high price compared to common or
normal white diamonds which are available in the market in abundance. Pink diamonds
leading with premium price than the rest fancy diamonds if all 4Cs remain the same.
In a broad note, fancy color for the diamonds is the advantage. When the miner grabs
fancy diamond it means he/she has scored a bingo.
2.4 Fancy Colored Stones/Gemstones
Each color stone has its own master color; the common color which is mostly known for
that gemstone to appear.
Ruby as red, Sapphire as blue and Tanzanite as blue as well. These are master colors of
these gemstones. When they occur into other different colors, they are called fancy.
Fancy Sapphire: This is the colored stone with master/common color of blue. When it
occurs into different color other than blue, it is called fancy sapphire like Pink Sapphire,
Orange Sapphire from Songea Tanzania, and Yellow Sapphire from Madascar etc.
In this case also, fancy sapphires assume high price due to rarity and high demand.
2.5 UNIQUENESS OF FANCY TANZANITE
Tanzanite Name History: Since Tanzanite is only found in one source in the world,
Tanzania East Africa. Tiffany & Co the main distributor by then decided to name it by
referring to the country of origin.
Colour Ranges: Tanzanite crystal occurs as a transparent rough with different colours
including brown, blue, greenish-blue and khaki. But the most common is the one with
blue colour. Predominantly blue tanzanite is generally worth more than other hues. The
deep blue (A- grade) is obtained by heating tanzanite in controlled temperature but also
they occur naturally.
Varieties: Tanzanite comes from Zoisite group. Before discovery of Tanzanite the only
Zoisite varieties known were Thulite and Anyolite.
A great deal of Tanzanite marketing makes a big deal of the "red flash" phenomenon of
Tanzanite. This is one of the features of the stone and is due to Tanzanite's trichroism.
Tanzanite is extremely light sensitive, with incandescent lighting (yellow lighting found
in common light bulbs) tending to shift its color to the violet side causing the red and
pink flashes to appear within the stone. The images below of the same stone show it
under white (daylight) and under incandescent light respectively:
TANZANITE GEM IDENTITIES
Refractive Index (RI): DR 1.69 to 1.70
Specific gravity (SG): 3.35
Inclusions: Often inclusion free but can include fine needles, pinpoints and clouds.
Hardness: 6.5 to 7
2.6 TWO TYPES OF FANCY TANZANITE
Type One:-Faded blue/brown color: In light of the above, tanzanite occurs in two
colors: blue and brown, but predominantly deep blue. Unlike other colored stones where
fancy color means different color apart from the master/common color, for tanzanite the
fancy color is the faded common color; pale blue or pale brown color. Beyond the Blue
Light color, the Tanzanite is called fancy tanzanite or sometime colored. Therefore the
fancy tanzanite is the one which is less bluish or brownish color below Light Blue (BL).
In that context, fancy tanzanite commands low prices than normal tanzanite. This is the
rule of thumb of pricing method in colored stones; low color, low price. Below is the
standard grading of tanzanite color and inclusion.
Tanzanite grading standards
Colour and Inclusion Abbreviation Explanation/What is seen in Gems
A Exceptional Colour, Eye Clean
B Rare Deep Blue/Brown ,other Colour, Eye Clean
BSI B Colour-Slightly Included
BI B Colour Included
BL B Lighter Colour Grade, Eye Clean
BLSI B Light-Slightly Included
BLI B Light Included
D Opaque Material(agreed to use D instead of O)
Type Two: Special Fancy Tanzanite: This is like other fancy color rules, that fancy are those
colors which are not common not blue or brown.
Since tanzanite is available at a Single source at Mirerani, everything mined or found together
with the pockets of tanzanite in the underground, is believed to be tanzanite. In 1990s they used
to find pink and green gems attached to tanzanite. These colored stones were called special fancy
tanzanite by the virtue of their origin being associated with tanzanite. On this case these special
fancy tanzanite assumed higher prices.
Points to ponder: Generally speaking, the price of fancy in relation to common colored
stone depends on the defined and traditional market segments and not generalizing that
fancy should assume higher price. As we have seen in this article some yes and some not.
3.0 FANCY COLOR VS MULTI-COLOR COLORED STONES
There are other colored stones which have multicolor. If the colored stone appear to have
multicolor naturally, these color ranges are not called fancy.
Tourmaline has all rainbow colors. Each color will have its own name and not called fancy
Tourmaline though most tourmalines occur in green color. The same applies for Zircon and
garnets which have different color ranges and are not called fancy.
Therefore there are should be a clear understanding between the fancy color and the multicolored
gemstones. The multicolored gemstones have no fancy names rather; they have the real known
names for each type of color range;
3.1 Some of the multicolored Color stones
Tourmaline: Tourmaline comes in a wide range of colors. It is believed to be a gem
with widest color ranges of any gem species.
Varieties: Tourmaline exists in six varieties categorized by their colours.
1. Rubellite tourmaline 2.Indicolite tourmaline 3.Paraiba Tourmaline
4. Chrome tourmaline 5.Parti-colored tourmalines 6.Watermelone Tourmaline
Zircon: It has wide range of color- colorless, strong blue, green-blue, yellow, brown, orange, red, violet. The most occurrences are strong blue and green-blue with green
color component.
3.2 Some of the Uses of Multicolored Colored Stones.
URU bracelets proudly Tanzanian Every URU piece is unique. The URU stones are exclusively sourced from Tanzanian small-scale miners throughout the country. In appreciation of the natural beauty inherent in the rough stones, the gems are used as they are found, ensuring that no two pieces are the same. The precious metal used in each URU design is hand carved, cast and polished by an URU artisan using age-old methods. Our unique threaded bracelet strap is hand woven by an URU craftsman in a time consuming process that takes up to six hours. More than 50 meters of thread in as many as six colours is used to create each piece. Dar-es-salaam, Tanzania, @ the Slipway. The Souk 1st floor.
WELCOME ARUSHA GEMSHOW WHERE ALL AFRICAN GEMS
ARE CONVENED
4.0 REFERENCE
1. Eng.Gilay Shamika (2013).Gemstones of Tanzania online publication.
2. Waterman, F (2000). Gemstones of the World
3. Eng.Gilay Shamika (2009). Gemstones processing Methods, Tanzanite Study Case
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