|
Gemological separation of heat treated sapphires from unheated sapphires;
quality factors
in grading natural sapphires. www.sapphires.ca |
Natural Sapphires FAQ |
|
|---|
|
|
|
Heat
treatment in sapphires
|
Heat-treatment is popular in the gem and jewelry business because it converts previously worthless gray stones into blues and yellows that sell for a lot more money. "Cooking" a sapphire is done at approximately 2000 degrees Celsius, almost the melting point of sapphire. "Diffusion- treatment" is a process that artificially introduces color into a stone by adding chemicals prior to heat-treating--All diffusion-treated sapphires have been heat treated. Diffusion-treatment is artificial enhancement of color and may be impossible to detect without sophisticated Lab procedures and instruments. Diffusion-treatment requires heat treatment. If a sapphire is free of heat-treatment, it can't have been diffusion-treated. We can eliminate diffusion-treated stones simply by eliminating all heat treated sapphires. If a sapphire has been heat-treated, it may be impossible for most dealers and gemologists to rule out diffusion-treatment. I've completed advanced gemological training, specifically for the separation of unheated sapphires from heat-treated sapphires, at The Asian Institute of Gemological Sciences in Bangkok, Thailand and at The Gemological Institute of America, Carlsbad, California, USA. This advanced training is the foundation for providing you with a genuine, unheated sapphire.
|
|
Certification
|
|
Gem Certification A Gemological Certificate indicating unheated sapphire accompanies each sapphire. "Third-party Certification" is granted by leading Gemological Laboratories in Sri Lanka only after their highly trained, experienced gemologists examine and test each unheated sapphire. Third-party certification is Impartial, Objective, Reliable.
|
|
Magnification
and magnifiers
|
|
When examined under magnification, almost all gemstones show "inclusions", the naturally-occurring variations in structure and composition that reveal origin and history of the gem. The size, quantity, location and type of inclusion determine value and desirability of a gemstone. Only "dark-field", binocular gemological microscopes are precise enough to accurately locate and evaluate inclusions. I always use a high-quality gemological 'scope to select untreated sapphires, gems with only the smallest of inclusions.
|
|
How
do you know these sapphires haven't been heat treated?
|
|
"Silk" is the name given to the mineral rutile that has formed thin strands within the sapphire. These thin strands of silk are visible with magnification. If a sapphire has been heat treated to enhance color, silk either disappears or forms thin lines of melted remnants. If silk is partially melted, leaving microscopic lines of tiny drops, we know the stone has been heat-treated. Intact silk indicates freedom from heat-treatment. Intact, unaltered crystal inclusions also indicate freedom from heat-treatment. Virtually every gemstone reveals some inclusions when examined under a gemological microscope. Very, very small inclusions have little impact on the value of a sapphire. Large inclusions have a large impact on the value of a gem. I specialize in sapphires that display a high degree of purity and clarity.
|
|
If
most jewelers, gem-dealers and consumers don't care whether or not a sapphire
has been heat-treated, why should I care?
|
Part of the appeal of a gemstone is that it's a creation of Nature, rare and exquisite, rather than the product of human manipulation. Not everyone feels this way about gemstones and for consumers who don't care whether or not a stone has been treated, there is a never-ending supply of stones that have been enhanced. For those of us who prefer a pristine gemstone that has not been "enhanced", there is an ever-decreasing supply of untreated gems. Untreated gems are rare and likely to become more treasured for the rarity that they represent.
|
|
How
large are these gems?
|
|
The
photographs have been greatly enlarged in order to show detail.
|
|
Proportion
Grading
|
Proportions are more important in diamonds than in colored stones. Excellent proportions are essential to the beauty of a diamond.because proportions determine how much sparkle it shows. The entire visual impact of a diamond is created by refraction and sparkle. But for colored stones (all gems other than diamonds), gem color has a greater impact on beauty than proportions so a wider range of proportion standards is applied to colored stones.
|
|
How
are these gems purchased at the source?
|
|
Each gem I select represents the best value in its category. Most stones coming out of the mines are poor color, uneven color or imperfect clarity. But miners and cutters have to sell everything they produce, not just the beautiful gemstones that are rarely found. So they assemble parcels of stones of mixed quality and sell the whole parcel to gem and jewelry wholesalers. Instead of buying parcels of gems consisting of a few good stones, some bad stones and a lot of mediocre stones, I select each stone individually. Using a gemological microscope, I sort through (and reject) literally thousands of gemstones, selecting only a fraction of one per cent of the gems offered. My selections are based on thirty years spent evaluating and grading gemstones.
|
|
Bluff
stones
|
"Bluff Stones" are stones that, to the untrained eye, seem to be a great bargain. A bluff stone's color may be good but it has so many inclusions that the stone has no "life" to it . Or it may be a large size but with a bad fracture that is difficult to see. Or its color may be only visible with perfect lighting conditions. Without perfect lighting, the stone becomes too dark or even changes to a different color.
|
Do you sell treated sapphires? |
Gemologically, a "natural" gem is one that has "come out of the ground" but the term "natural" does not indicate it's free of treatment. (If it's man-made in a factory or "grown" in a Lab, it can't be called natural. It should be identified as "synthetic".) I never offer sapphires that have been heat-treated (thermally-enhanced), burned, diffusion-treated or enhanced in any way. I never offer synthetic "gems". Every sapphire on this site is Unconditionally Guaranteed genuine, natural, unheated and free of treatment!
|
|
The
most common sapphires now available
|
|
Most sapphires available are known as "Australian sapphires"; a trade term for a sapphire that is "inky" dark blue. These sapphires are usually too dark. Most of them show a strong blackish component that makes them very unattractive, when compared to a good stone. The term "Australian sapphire" is not restricted to sapphires found in Australia; it is applied to any blue sapphire that is overly dark and has a strong blackish component. These are found in Nigeria, China and Thailand as well as Australia. These sapphires are very popular in the gem trade because they are so cheap at the source and many consumers have been misinformed as to their true value by being told that "dark is better". I don't carry "Australian" sapphires.
|
|
Do
you sell synthetic sapphires?
|
|
Synthetic "gem" is man-made material that appears to duplicate the chemical and crystallographic structure of a natural gemstone. I never offer synthetics of any kind! Some synthetics are manufactured
in large scale factories while some are made in small batches in "laboratories".
Whether they are flux-grown, lab-grown or flame-grown they
are all man-made and I don't carry them. Every sapphire on this site is Unconditionally Guaranteed genuine, natural, unheated and free of treatment!
|
|
Yellow Sapphire Color
|
|
Until heat-treatment became wide-spread about 30 years ago, very deep "burnt orange" yellow sapphire was not available. Very Deep orange-yellow color is virtually never seen in an unheated yellow sapphire. When these deep orange-yellow sapphires are compared to unheated yellow sapphires, the treated stone shows more intense color. You may prefer the more intense color of thermally-enhanced yellow sapphire but it's good to keep in mind that its color results from "cooking". (If all heat treated yellow sapphires came out of the oven with a deep orange-yellow color, separating them from untreated stones would be simple but that isn't the case. Many heat-treated yellow sapphires are within the color range of untreated yellow sapphire.) |
Returns |
Every sapphire on this site comes with a 30 day, full-refund return policy. I ask only that you return the gem in its original condition and that it hasn't been set into a piece of jewelry prior to its return. If you'd like more information about returns, please contact me at: billkent@islandnet.com |
|
What
does the price include?
|
Prices All prices are in Canadian Dollars. All Canadian and American Clients receive their gem purchases free of taxes, customs fees or shipping charges. You'll pay nothing extra.
shipping charges. Plus, you receive an Export Discount of 7%, independent of currency exchange calculation.
International Clients: You receive an Export Discount of 7%, independent of currency exchange calculation.
IMPORTANT NOTICE: The Canadian Dollar has gained strength and now I can purchase gems in Asia at much better prices. So I'm passing this saving on to you.
Effective immediately, all items are reduced by 10% from list price. Please subtract 10% from prices shown on-site. All Canadian, American and International Clients immediately qualify for this benefit.
The Export Discount of 7% for American and International clients is calculated after subtracting the 10% price reduction.
Please contact me at billkent@islandnet.com with any questions you may have.
|
|
Privacy
policy
|
|
I don't sell, trade, rent or give away your personal information to any one. I don't collect information on visitors to my site by the use of cookies or by any other method. |
![]() |
|
I make frequent trips to Sri Lanka to select sapphires at the mines. Here we're using an ancient technique for separating rough gems from muddy gravel excavated from the mines--the first step in the long journey your untreated sapphire travels to you!. Hands-on selecting untreated sapphires at the mines
saves you money! |
|
Profile
|
|
Bill Kent G.G. |
This experience and expertise saves you money. |
Member
|
Strict standards of gem valuation are required of members of this professional association. This enables you to make price comparisons based on realistic, accurate prices. |
|||||
|
Training |
Professional education and recognition from the leading Gemological Institute guides my selection process and ensures the untreated status of your sapphire. |
Advanced
Training
|
... Advanced, specialized, in-depth education in the separation of treated and untreated sapphires further protects your investment in your untreated sapphire. |
|||||
|
William
Kent Corporation In
Canada call toll free: 1-800-656-5368 .www.sapphires.ca . your best source for untreated sapphires . |
|
Privacy
Policy
|
|
I don't sell, trade, rent or give away your personal information to any one. I don't collect information on visitors to my site by the use of cookies or by any other method. |
faq.html