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Deep Blue Sapphires
CHEMISTRY: Al2O3
CRYSTALLOGRAPHY: Hexagonal
REFRACTIVE INDEX: 1.757 - 1.779
HARDNESS: 9
SPECIFIC GRAVITY: 3.99 - 4.0
CLEAVAGE: None
HEAT SENSITIVE: No
WEARABILITY: Excellent
SPECIAL CARE INSTRUCTIONS: None
ENHANCEMENTS: Heat treated. Common.
Diffusion treatment, (places a thin blue coating
on colorless sapphire.) Occasional. Irradiation,
(turns colorless gems yellow, orange or light blue.)
Rare.
Wearability: Excellent
In Our Opinion
Although sapphires come in all colors from any of the
mining areas around the world.
It has been our experience that most of the smaller deep blue sapphire.
Found in commercial
verities of jewelry are from three primary areas. Australia, Thailand
and Sri Lanka (Ceylon).
As with turquoise and the term Persian, being more a
statement of color, rather than location.
So is it, with dark blue sapphire. For many years Thailand was the major
producer of dark blue
sapphire. Therefor most of us think, Thai or use the term Thai Sapphire
when we see a rich
royal blue sapphire.
As with most mining areas. Depletion at some time or
another becomes a factor. As is true
in the case of Thailand sapphire. More recent discoveries of rich royal
blue sapphire have
come from Australia. Allot of Australian sapphire is being cut in Thailand
and may even be
represented as Thailand Sapphire.
In any event this type of sapphire still enjoys wide
popularity. As we stated earlier small
stones may come from anywhere. But in most cases larger sized stones do
come with specific information of their locality. We will include
this information whenever possible. We have also
found an interesting article about the Australian sapphire fields.
Recent Sapphire Digs
in Australia

The Central Queensland Sapphire Gemfields is one of
the worlds significant Sapphire resources. Sapphire was discovered here
about 125 years ago near Retreat Creek and has been mined intermittently
ever since. The earliest mining was by hand and included mining conducted
by emissaries of the Russian Czars. Providing many of the gems for the
lavish Czarist crown jewels.
The early 1970's witnessed the introduction of machinery mining and the
Sapphire Industry boomed until 1977 when a downturn began. Mining activity
waxed and waned due to the price fluctuations of rough sapphire and in
1997 only two machinery miners continued to operate. This was mostly due
to the collapse of the Asian currencies (especially the Thai Baht) and
the flooding of the world market with sapphire from new fields in Madagascar.
In mid 1999 the Australian Sapphire Industry took a more positive turn
as economies strengthened and the supply from Madagascar diminished. As
a result of slightly improved prices there are now several medium to large
machinery mining operation on the Gemfields. These are mainly family companies
that employ 2 to 6 people, the largest company is GTN Resources which
employs 15 people.
Many small hand mines still exist on the Gemfields. The small miners are
normally working the areas of richer 'wash'. Whereas the machinery miners
are limited to the less concentrated or deeper deposits. Conditions set
buy the Mines Department.
A large proportion of the sapphire produced on the Gemfields is to cater
to the export market. Annually some $ 10 to $ 12 million of rough sapphire
is sold mostly to Thai agents who ship the rough sapphire to Thailand
where it is cut and processed.
The best of the material is on-sold as "product of Thailand", and only
the lower grade material is being sold as Australian stone. This deceit
has been going on for decades. The Tourism potential of the Gemfields
has developed significantly over the years.
In the early days it was mainly the dedicated 'Rock Hound' who came out
and roughed it for a chance to find their own gems. With the continual
improvement in roads and infrastructure, especially over the last 10 years,
the Gemfields has become a much easier and more comfortable place to visit.
The main towns in the area are connected by bitumen road. Anakie, Sapphire
and Rubyvale now have a town water supply. Well-established caravan parks
exists in all the townships. The Outpatients clinic and Ambulance Station
have greatly improved the health care services available.
Perhaps the biggest boon for travelers and tourists has been the development
of fossicking parks. These parks have made it easy for anyone to have
a real chance at finding a Sapphire. Most provide the equipment needed
to find sapphire, washing drums, sieves and sorting table.
The visitor purchases a bucket of Wash and can them sieve that bucket
for Sapphire. The Wash comes from sapphire bearing ground but all the
back breaking work of digging down to the wash layer is already done.
The parks also provide valuable experience on how to correctly sieve and
identify sapphire.
Most also offer gems cutting and jewelry services For the serious fossicker/prospector
they is still the opportunity to go out in the bush and dig for sapphire.
The Qld Mines Department has reserved areas of the gemfields as Fossicking
Areas.
As for the cost of a fossicking permit. A visitor can dig in these areas,
any stone you find is yours to keep. The fossicking areas have been selected
for relatively shallow digging with a good chance of finding quality material.
To dig outside the fossicking areas other regulations apply and normally
a mining claim or lease must be plotted and registered before digging
can occur.
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