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Tag: Sapphire

Burma: What Does It Mean for Gems?

Burma

(Also Known as Myanmar)

No heat antique Burma ruby ring

Burma Ruby and Diamond Ring Sold, November 2017, $22,000

Burma, it’s a name that evokes images of great treasures to anyone who knows about gemstones.

Now known as Myanmar, the country is still referred to as Burma by many people.

The country of Burma is in Southeast Asia, bordering India, Bangladesh, China, Laos, and Thailand. Several of these countries are known for their gem wealth. However, this one country stands out as a shining light among the great gem sources.

The Most Famous Rubies in the World

Burma is historically known as the source of the finest rubies in the world.  These remarkable red gems are found in several sources, but no rubies are as eagerly sought-after as those from Burma, the most famous of gem sources.

The finest Rubies from Burma have an intense to vivid tone of slightly pinkish red colour, and it can be a colour that is remarkably eye-catching. Of course, variations in colour can come from any source, but Burmese rubies are very fine, on average, and are reminiscent of a hot coal.

Other countries in Asia are noted sources of ruby. Neighbouring countries of Thailand, Cambodia, Laos, and nearby Vietnam have all produced many beautiful rubies. However, these nearby sources don’t have the same fame and history. Also, none of the other sources produces rubies of quite the same vivid colours.

Additionally, a number of countries in Africa have been producing rubies, but still Burma rings on the lips of gem lovers.

Jade

Jadeite jade ring

Burma (Myanmar) jadeite jade and diamond ring, Lot 354, offered in the Important Jewels Auction, June 2018

Jade is a gem that is famous for its luminescent green colour. The word “Imperial” is often given to the richest, strongest green found in the gem known as jadeite jade.

Two types of gem that are called jade: Jadeite jade and nephrite jade. The rich and vibrant green of the finest jadeite from Burma is unmatched. There really is no other source for this most precious jadeite jade. While the other type of jade, nephrite, is found in many countries around the world, Canada is a major exporter of this other type of jade. Nephrite jade has a lower intensity of colour and often has a greyish green colour. Historically, for centuries, jadeite jade of a bright green colour and a high degree of translucency has been a gem most highly prized in China. and other countries.

Sapphire

Lot 402 June 2018

6.44 carat Burma (Myanmar) sapphire offered in June 2018 Important Jewels Auction

Burma is a source of very beautiful sapphires, and has been for a very long time. The only sapphire more desired is one from Kashmir, but Kashmir hasn’t been mined for decades, making sapphires from Kashmir extremely rare. So, these days, Burma produces some of the finest sapphires in the world. The colour of a Burma sapphire is often a rich and very attractive blue.

Burma is a key gem source, and remains that way after centuries of production, it is highly important to this day. The country is a most highly desired source for the most important gems in the world. Being from Burma adds to the value of a gem when compared to similar gems from other countries.

We are very fortunate to have the consignments that allow you to purchase Burmese gems at Dupuis auctions on a regular basis.

 

Stars among gems

Star Sapphire at Dupuis Auctioneers

Star Sapphire at Dupuis Auctioneers

Stars are rare among gems, but given the right conditions, the right crystallographic structure, the right gem, and the right inclusions, all working together, a gem might exhibit a star. These four star sapphires are shown in a group, a constellation, and were all offered in the November 2013 Dupuis fine jewellery auction, lots 183 (go to: http://bit.ly/18orDoj ), 282 (go to: http://bit.ly/IGsQAH ), 454 (go to: http://bit.ly/1eTAHWu ), and 655 ( go to: http://bit.ly/1kgeza4 ) in the sale. The catalogue can still be viewed at www.dupuis.ca

Star Sapphire at Dupuis Auctioneers

Star Sapphire at Dupuis Auctioneers

Sapphires will usually show a six rayed star, some gems (garnets and spinel, diopside) might show a four rayed star, while others may show as many as twelve rays.

The star in a sapphire is caused by light reflecting from the surface of parallel needle-like inclusions of a mineral called rutile, formed in relation to the hexagonally related growth structure of the sapphire.
The rays of the star are perpendicular to the direction of the inclusions (think of light reflecting from combed hair pulled into a pony tail, or reflecting from a spool of thread: The line of reflection is in the opposite direction to the direction the hair or threads are going). The star will only show on a domed surface such as these cabochon cut gems, or beads or spheres, and not on a flat faceted surface.

Star Sapphire at Dupuis Auctioneers

Star Sapphire at Dupuis Auctioneers

What makes a star gem desirable is a combination of the features that make any gem desirable: Colour, clarity, carat weight, and cut, plus it has the added bonus of the phenomenon of a star. The best star will be well-centred, very distinct, have all of the “legs” of equal strength, and as straight as possible.
In auction catalogues, star gems are often shown without the star in evidence. This is because the sharp, single source, un-diffused light required to show the star will usually detract from the photograph in most other ways, and the colour of the gem doesn’t show as well as it can.

Sometimes a star sapphire may also have the added bonus of having a colour change, such as lot 244 in the November Dupuis sale. This sapphire has a six rayed star, plus it has a colour that is purple in candlelight or incandescent light, and blue in daylight or fluorescent light (this gem was mentioned in an earlier post too).

Untreated Star Sapphire

Sapphire Ring

Sapphire Ring

Sapphires are amazing for many reasons, including the diversity of colours they may have, the phenomena that may have, and the parts of the world where they may occur.
On average, sapphires are thought to be blue, but they really can be any colour except red (red is reserved for ruby of the same mineral).
This gem has several interesting things to note: It is a star sapphire, with needle-like inclusions oriented in three directions causing reflections to form a 6 ray star, plus it changes colour, purple in incandescent light and bluish in daylight, but it also has bubbles that move around in liquid filled inclusions (one of the bubbles disappears when the gem is warmed to hand temperature, and returns when it cools down). The liquid filled inclusions virtually prove that the gem has not been heat treated, the presence of the star due to inclusions helps to prove it (these would be damaged during the heating process). This sapphire likely originates in Sri Lanka. Lot 244 in the upcoming November 24th 2013 Dupuis Auction. For more information go to: http://bit.ly/HYXndu

Sapphire Ring Inclusions

Sapphire Ring Inclusions

Unheated Sapphires

Sapphire and Diamond Ring

Sapphire and Diamond Ring

Sapphires and rubies are among the best known gems in the world, the gems flowing through the hands of storybook pirates when they delve into their treasure chests. The gems that are entirely untreated, and are the colour they were when they were mined are very rare, and are most sought after. This pink sapphire has needle-like inclusions, the tell-tale indicators that there has been no heat applied to the gem. These needles, seen through a microscope, in a sapphire are arranged in three directions at 60 degree angles to each other, and are found in this sapphire, lot 80, in the upcoming Dupuis auction, November 24, 2013. for more information go to: http://bit.ly/1bAYQiF

Needle-like inclusions

Needle-like inclusions