cut gemstones... what are they? That is a question sent in by a lady new
to the world of gems and jewelry investing.
indicated she had looked through our archive of newsletters, but had not
found a specific reference. I'm pretty sure I've never written an answer
to this question before. I will answer her question here.
cut gemstones is a term with multiple meanings, including:
phrase can correctly be used in a discussion where the context is known.
But one of the three terms listed above should be employed (if appropriate)
in a gem's written description.
to the standard length and width dimensions used by manufacturers of
jewelry mountings that feature gems. If a manufacturer is making many
pieces of the same design, they produce a master first. From the master,
many production pieces are made, all requiring the same size gems. For
instance, a marquise shaped gem in 8 mm in length, by 4 mm in width, is a
calibrated size. A marquise shaped gem 9 mm in length, by 4.5 mm in
width, is not a standard size.
can be cut to calibrated size by either automated or older style
faceting machines... but its a lot easier using the computer controlled
machines. Cutting to a
specific size generally means more of the rough crystal is wasted.
refers to the angles at which the upper and lower parts of a stone are
cut. Different gem species have different light bending properties.
Refraction, as it is called, will vary in gems due to chemical composition
and crystal structure. To understand why gems are
faceted, it is essential to understand how light behaves once it passes
into a gemstone from the airLight
can either be reflected off a surface or pass through the surface
into the new substance. When light passes from one material into another,
it is bent, or refracted. For example, gems with a refractive index of 1.5 will have a critical angle of 41.81° between the
girdle and the culet in a brilliant cut.
a gem was cut using an automated production faceting machine. These days,
the machines are computer controlled. The software is loaded with
information on various gem species... gem refractive indices, shapes,
cuts, sizes, angles, and other pertinent information. The information can
be called up on the computer control panel for each job as needed.
modern computer controlled faceting machine differs greatly from the
traditional hand cutting faceting machines.
cut gemstones tend to be popular gems with good color and a lower price
point. For example, topaz, amethyst, citrine, and garnet.
faceting methods are entirely capable of producing gems of extremely high
quality. Almost all premium gems are faceted using traditional faceting
methods and equipment. The rough crystals of top quality premium gems such
as emerald, ruby, tsavorite, and alexandrite are very valuable and rare.
To maximize value, each gem is carefully cut to the size and shape
dictated by the piece of rough.
cut gemstones can be as good as the term sounds, but that is not always
the case. Computer controlled faceting machines produce stones of exactly
the same dimension and angles until the machine's settings are changed.
While proper angles are programmed into automated faceting
machines, the operator can change the settings and "cut for
weight," meaning they could use a lesser angle and retain more of the
rough stones weight in the finished gem..
cut gemstones are, when you get right down to it, the gems that are lively
and beautiful. A gem
cut to the proper angles, with good color, good clarity, and good polish
will be pleasing to the eye. Written and verbal descriptions help, but the
true test of a gem is its appearance.
Top - Amethyst oval
Next - Topaz marquise in Swiss
Next - Gem refraction
Next - Traditional faceting
machine (electric powered) requiring manual intervention
controlled faceting machine
Special Offer - White
topaz - An alternate April birthstone
Next - Dealer Product Image - Chrome Diopside and White
Topaz Ring in Sterling
Last - Dealer Program Image - Pink Spinel and Sterling
A Google search using keywords such as calibrated faceting
or gemstone critical angle can return some very interesting
information and websites.
Here is this month's special gem deal. I have a good
stock of topaz in many colors. I have several matching white topaz gems
in this size.
We keep gem prices low by buying quality gemstone rough
worldwide, and having the rough material cut by our gem cutters in Asia.
Gem Industry News
Las Vegas Jewelry and Gem
The Las Vegas trade shows are coming. Make your plans and hotel
GLDA Las Vegas Show -- May 30 - June 2, 2012
The 13th Annual G.L.D.A. Las Vegas Gem & Jewelry trade show will be
held in the fabulous 90,000 square foot, $120 million dollar "Mirage
Events Center", The Mirage Casino-Hotel is located on the strip in
Las Vegas across from the Sands Convention & Expo Center.
AGTA GemFair -- May 31, 2012 - June 4, 2012
The 2012 AGTA GemFair™ at the JCK Las Vegas Show is
located in the South Pacific and Islander Ballrooms in the Mandalay Bay
JCK Las Vegas Show -- June
1 - June 4, 2012
Access the best selection of products in the jewelry industry at JCK
Las Vegas. See all your favorites under one roof while building and
sustaining relationships with more than 2500 participating companies from
From a supply perspective, now is the time to replenish your depleted inventory.
If you have some money to invest in inventory - there are deals to be had.
And you should have some cash. After all, that depleted inventory was sales.
From a sales perspective, gift giving occasions have not disappeared. Birthdays,
anniversaries, and many other reasons to give nice jewelry at a great price just
keep on coming. Your customers (and their friends) need what you offer!
A market where people perceive they should spend less fits right into your
Be The Quality Jewelry Discounter.
Do you enjoy jewelry and gems?
Do you enjoy talking with friends and friends