Precision
Jewelry & Gems
The following is only a partial list of some of the
"Elite collection" of connoisseur collector gemstones that we
offer set in beautiful jewelry!

Alexandrite

Alexandrite, a member of the ‘Chrysoberl’ family of gemstones, is known to be the rarest
gemstone of them all…  Discovered initially in the Ural Mountains in Russia in the early
1800s it was named after Czar Alexander II.  This gemstone owes its notoriety to the ability
to shift color between daylight and incandescent light.  The most valuable stones can cost
in the many tens of thousands per caret in larger sizes if a high percentage of color
change exists and when the color shift is from red to green color.  Alexandrite or “ALEX” as
it’s often referred to would, for the most part, not exist still if new finds had not occurred in
Brazil, Madagascar and Tanzania.  Variations on the color and degree of shift have made
“Alex” somewhat affordable for the more modest connoisseur collector. Alexandrite is
usually not treated but synthetics do exist and for this reason a cert. from a reputable
major gem testing lab on all stones is essential when buying this gemstone! We believe
that any time true certified “Alex” is offered in over one caret sizes a true collector
opportunity exists!  

Gemstone Facts (Alexandrite)
Composition: Beryllium, aluminum oxide
Hardness: 8.5 on Mohs scale
Refractive Index: 1.74 -1.75
Specific Gravity: 3.71
Color Change: Yes
Origin: Ural Mt.s (Russia), Brazil, Sri Lanka, Tanzania, and Madagascar

Colored Diamonds

Fancy colored diamonds are indeed a rarity and very desirable for the connoisseur
collector of valuable gemstones.  Normally a white diamond is composed of just the
single element carbon.  In nature to end up with a natural “fancy” colored diamond some
other impurity must find its way into the diamonds tight elemental structure.  When this
happens a range of colors is possible for fancy color diamonds.  In fact a famous
collection of colored diamonds includes thirteen individual colors for “fancies”. The rarity of
any fancy colored diamond is many times greater than a flawless D white diamond.  As
such the record prices recorded for sales of fancy colored diamonds are quite amazing!  
For example a fancy intense pink of 7.37 carets sold for over six million dollars.  A fancy
vivid yellow of 13.83 carets sold for over 3 million dollars.
At “Precision Jewelry and Gems” we will only offer fancy colored diamond jewelry if we
believe it offers a significant degree of value and affordability.  We then will only sell 100%
natural untreated EGL certified and appraised fancy colored diamond jewelry.  This type of
integrity and disclosure for all of our jewelry offered for sale is  one of the services that sets
us apart form other quality internet jewelry purveyors’

Gemstone Facts (Colored Diamonds)
Composition: Carbon
Hardness: 10 on the Mohs scale
Refractive Index: 2.42
Specific Gravity: 3.52
Color Change: No
Origin: India, Brazil, South Africa, Australia, Russia, USA, and Brazil

Sapphire

A very beautiful and precious gemstone that is  considered one of the "big three" (emerald,
ruby and sapphire).  Sapphire is actually a member of the corundum family along with
ruby.  Blue color sapphire is the best known and highly prized, but other colors (a.k.a.
"fancy sapphires") come in pink, yellow, green,  and pink/orange color "padparasdscha."
These fancy sapphires are very beautiful and some are very expensive; (padparadscha).  
Sapphires are frequently heat treated to improve color, which is accepted as a standard
practice. Additionally a sapphire may have additional treatments that are generally not
desirable for the connoisseur, collector, or investor. Treatments such as diffusion
treatment, oiling, and berillium heating should be avoided. In all cases a certification on
the true treatment disclosure of any sapphire is essential when purchasing one of value.
Another quality that a sapphire can possess is color change.  Essentially this is a shift in
color appearance of the gem in different lighting, daylight versus incandescent; making a
valuable gem even rarer!

Gemstone Facts  (Sapphire)  

Composition:  aluminum oxide
Hardness:  9 on Mohs Scale
Refractive Index:  1.76-1.77
Specific Gravity:  4.00
Color Change = possible
Origin - Burma, Sri Lanka, India, Thailand, Australia, Cambodia,Nigeria, USA,

Spessartite Garnet


Spessartite or spessartine garnet is a member of the garnet family. It occurs in a true
orange or orange red color and has the highest refractive index of the three orange
garnets, the others being malaya and hessonite. Spessartite is rare and is among the
hardest member of the garnet group making it suitable for jewelry use. One of the newest
and best sources for this beautiful garnet in a true madarine orange is Namibia and also
Nigeria. The most valued and sought after are the virtually pure orange and the burnt
orange variety.  Larger stones in over five carets are rare and over ten carets extremely
rare.  Once one sees an exceptional example of this fiery beautiful orange garnet it is easy
to see why it is so  prized by collectors and connoisseurs.  Experts predict the investment
value of fine examples of this gem to climb in the future. This collectible gemstone set in
jewelry will be truly unique and  beautiful!

Gemstone Facts (Spessertite Garnet)

Composition - Maganese aluminium silicate
Hardness - 7-71/2 on Mohs Scale
Refractive Index - 1.79-1.81
Specific Gravity - 4.16
Origin - Sri Lanka, Madagascar, Brazil,Burma, Germany, Africa




Spinel

A rare and beautiful gemstone that few persons outside collectors and gemstone
connoisseurs even know exists... This gemstone is represented by  two of the most
notable gemstones in the  British Crown Jewels; the Black Prince's Ruby and the Timur
Ruby, both of which are actually spinel, not ruby.  .Spinel is now rarer than Ruby, posses
more fire (dispersion), and is currently much more affordable.  Other reasons why spinel
is so coveted by connoisseurs is because spinel is one of the few gemstones that is
presently not enhanced in anyway and is hard (8 on the Mohs scale of hardness) for
jewelry use.  A number of notable authorities recommend  spinel as a potential investment
gemstone before the cost becomes out of the reach. Although its existence is mostly
unknown the sky is truly the limit for future price increases. These increases are based
upon its intrinsic value, desirability, and rarity. Another  feature of some spinel gemstones
is their ability to exhibit a color change. This definitely is a gem to own in a beautiful piece
of jewelry!

Gemstone facts (Spinel)

Composition:  Magnesium Aluminum Oxide or Magnesium Aluminate
Hardness: 8 Mohs Scale
Refractive Index: 1.714-1.736
Specific Gravity: 3.58-3.75, exceptional to 4.06
Color change=Yes, possible
Origin - Burma, Sri Lanka, Madagascar, Vietnam,  Afghanistan, Pakistan, Brazil, USSR.

Tanzanite


A beautiful and rare single source gemstone found only in Tanzania, Africa. This
gemstone has only been discovered since 1967.  Tanzanite is a trichrotic gemstone,
which means it exhibits one of three colors depending on the lighting and how it is
viewed.  Most gem quality tanzanite is eye clean, and the deeper the color saturation the
more desirable the gem.  Many are predicting that this gemstone may be mined out over
the next decade with rarity and value potentially escalating signifigantly.  The gemstone is
6 1/2 on the mohs hardness scale, which is generally considered the starting point  
needed for jewelry use. If worn daily it should be treated with care avoiding ultrasonic
cleaners.  If you love a blue/purplish color stone with beautiful crystal this is a gemstone
for your jewelry collection to get and keep as a collector and connoisseur.


Gemstone Facts - (Tanzanite - Zoisite)

Composition - Calcium aluminium hydrosilicate
Hardness - 61/2 Mohs Scale
Refractive Index - 1.60-1.70
Specific Gravity - 3.35
Origin - Tanzenia

Topaz- Precious - Imperial


Truly exceptional examples of precious and/or imperial Topaz are beautiful and rare in
every size and color.  Most of the worlds commercial reserve of imperial  and or  precious
topaz comes from the Brazilian town of Ouro Preto.  Other smaller deposits come from the
Ural Mountains in Russia, Afghanistan, Burma, and Pakistan. Many people confuse the
commercially available treated topaz as what topaz looks like and its value.  Nothing could
be further from the truth.  Natural untreated precious and imperial topaz is beautiful, rare,
and hard enough for jewelry use, 8 on the mohs hardness scale.  The natural occuring
colors of topaz range from yellow, light to dark orange, peach, and violetish red.  Oh yes,
topaz does come naturally in a blue, but due to the commonness of treated blue topaz it is
difficult to recommend this common color to the serious conoisseur collector. A wonderful
feature of the beauty of natural precious topaz is its soft velvet appearance and high
transparency. The rarest of the precious topaz is the pinkest in color (only if not enchanced
by radiation or coating). We love this gemstone and feel it has a significant role to play in
the future from increased demand, rarity, and beauty. Now is an excellent opportunity to
own a beautiful precious/ imperial topaz piece of jewelry at a relatively low investment cost!

Gemstone Facts (Topaz - "Precious/ Imperial")

Composition - aluminum fluorohyrosilicate
Hardness - 8 on Mohs Scale
Refractive Index - 1.62-1.63
Specific Gravity - 3.54
Origin, - Brazil, USA, Sri Lanka, Afganistan, Pakistan, USSR, Africa, Mexico



Tourmaline - (Paraiba)

These very rare, beautiful, and special tourmalines are unique in all the gemstone world
because of their extraordinary neon vividness. They were not initially  discovered until the
1980's  in the Federal Brazilian State of Paraiba. The new tourmaline owed its color and
vividness to copper often containing manganese.  These two elements combine in the
Paraiba Tourmaline to offer wonderful varying shades and vividness that the  Paraiba
Tourmaline is legendary for.  In fact these gems are so coveted by collectors and
connoisseurs that they  have commanded prices in the many thousands of dollars per
caret.  Unfortunately the availability of this gemstone in larger gem sizes only lasted a few
short years and now larger clean stones are rarely found in Paraiba Brazil.   Fortunately in
2001 Paraiba like Tourmaline was discovered in Nigeria and Mozambique. The reason
scientists believe that the gems were also found in Africa is because they believe the  
sources  were separated when the continental drift took place millions of years ago when
the two landmasses were once joined.  The new finds have been verified to contain
copper and labs who certify gems agree that when they find copper in the gems they are
indeed Paraiba like tourmaline.  Value of the new Paraiba tourmaline from Africa is on the
rise and may reach full Brazilian Paraiba prices in the near future. Gemstone advisors
have recommended investing in some of this newly discovered Paraiba material from
Africa while one can still afford to do so. What's even better about the newly discovered
tourmaline is the fact that they have found completely new exotic colors that can only be
found in the African material that were never seen before! Paraiba tourmailine jewelry
makes a beautiful addition for a connoisseur collector.

Gemstone Facts (Paraiba Tourmaline)

Composition:  Complex borosilicate with copper, manganese  
Hardness:  7-71/2 Mohs Scale
Refractive Index:  1.642-1.644
Specific Gravity:  3.06
Origin - Brazil, Nigeria, Mozambique
Copyright © 2006 Precision Jewelry & Gems, Inc. All Rights Reserved.