Shiraz Jewelry

Shiraz Jewelry

Sunday, 17 March 2019 10:59

Ruby Ring with Diamonds


Center Stone: Natural Ruby
Side Stones: 2 x Diamonds
Metal: 18K White Gold 
Size:  Free Resizing 


When we design this ring, we realize that a good quality Ruby is getting more difficult to find. But we love Ruby and pair it with 18K white gold they make a stunning ring. We know exactly what we put in the ring. When you are in Chiang Mai and visiting our store, we show you this ring if you will. 

It doesn't have to be diamond. Ruby can be a great center stone for an engagement ring.

Note that the ruby's weight may vary.

Tuesday, 12 March 2019 13:53

Tanzanite


Color: Sapphire blue, amethyst, violet
Hardness: 6.5 - 7 Mohs
Specific Gravity: 3.35 
Refractive Index:  1.691 - 1.700


The name Tanzanite was introduced by the New York jewelers Tiffany & Co after an East African state called Tanzania. The name is accepted by the gems trade, but scientist refer to it as Blue Zoisite. We have to thank Tiffany & Co for disliking the name 'Blue Zoisite' which sounds pretty much like 'Blue Suicide'.

Where do we get Tanzanite gems
Obviously in Tanzania we can see the mines operating to get tanzanite gems. Nowhere else. However, the government of Tanzania banned the export of rough stones weighing more than one gram. Most likely you will see the fine, polished tanzanite gems when you visit your local gems store.

Heat treatment
Most (if not all) tanzanites used in jewelry industry are heat treated. The temperature is usually between 730-390°C for 30 minutes, and the stones should not have any cracks or bubbles, as they could shatter or the cracks/bubble could increase in size during furnace heating. (Ref: Wikipedia)

Other treatment
Recently, coated tanzanites were discovered and tested by the AGTA and AGL laboratories. A thin layer containing cobalt had been applied to improve the color. It was noted that "coatings in particular are not considered permanent", and in the United States are required to be disclosed at the point of sale.

 

Monday, 11 March 2019 23:47

Topaz


Color: Colorless, yellow, red-brown, light blue, pinky red, pale green
Hardness: 8 Mohs
Specific Gravity: 3.35 - 3.56
Refractive Index:  1.610 - 1.638


In the past all yellow and brown gemstones were called "topaz". With advancement of technology we can happily distinct topaz from the less valuable gemstones such as citrine. A variety of impurities and treatments may make topaz wine red, pale gray, reddish-orange, pale green, or pink (rare), and opaque to transparent.

Important Topaz deposits in the world
Today's most important mines are located in Brazil, Sri Lanka, Burma, and Russia. Some clear topaz crystals from Brazil can reach boulder size and weight hundreds of pounds.

Most desirable Topaz color is pink and orange
Colored topaz are rarely vivid. The most common color is yellow with a red tint. The most valuable is pink. Orange topaz also known as precious topaz. Some topaz can fade on exposure to sunlight.

Topaz must be carefully handled
Although topaz is very hard, they must must be treated with greater care than some other gemstone of similar hardness (such as sapphire, ruby) because of a weakness of atomic bonding in different planes. This gives topaz a tendency to fracture along such a plane if struck with sufficient force. An experienced stone setting would have a good knowledge on how to set topaz into jewelry.

 

Thursday, 28 February 2019 23:07

Sapphire


Color: Blue, colorless, pink, orange, yellow, green, purple, black
Hardness: 9 Mohs
Specific Gravity: 3.99 - 4.00
Refractive Index:  1.766 - 1.774


Sapphire is a precious gemstone which is typically blue, but natural 'fancy' sapphires also occur in yellow, purple, orange, and green colors. They occur also in gray and black, and can be colorless.

Sapphires are hard stone at 9 Mohs, making them perfectly suitable for rings, engagement rings, earrings, pendants, or any other jewelries used everyday.

 

If you can see the tiny lines in this sapphire means the stone is natural and real. Some will dislike it considering...

Posted by Shiraz Jewelry on Sunday, March 31, 2019

 

Heat Treatment
It is common practice to heat natural sapphire to improve or enhance color. Evidences shown that the practice goes back at least to Roman times. Now, heat treatment often accompanied by beryllium under very high heat (just below the melting point of sapphire).

Synthetic Sapphire
Be aware when you found a sapphire gemstone that is very, very, cheap. The saying, 'if it is too good to be true, then probably it is not true" applies here. They are typically very clean without any inclusions. Visit only your trusted store to ensure you get genuine sapphire. 

Thursday, 28 February 2019 22:52

Spinel


Color: Red, pink, violet, yellow, orange, blue, dark green, black
Hardness: 8 Mohs
Specific Gravity: 3.58 - 3.61
Refractive Index:  1.712 - 1.736


Spinel is a fascinating gem that occurs in a wide range of colors, such as carmine-red, blood-red (or 'ruby-spinel'), brownish-red, rose-red, orange, blue, violet-blue, dark blue, purple, greenish, and black. 

Large fine spinels are great treasures, yet few people know of their existence. That is because spinel sometimes associated with ruby and sapphire. The hardness of 8 on the Mohs scale makes spinels durable gems, suitable for daily wear jewelry.

Where are spinels coming from?
Main deposits in Burma (Myanmar) and in Sri Lanka. There are deposits in Thailand too, although not too large. 

Should you be worried of synthetic spinels when buying natural spinel?
Yes. Synthetic spinels are commonly seen in class rings and inexpensive birthstone jewelry. Synthetic spinels have been on the market since 1920s. They imitate natural spinel, and also many other gems. 

But since natural spinels are very hard, lovely, and durable, spinels should be more popular that they are now - the current neglect is due to a lack of exposure to the public by the jewelry trade. This is your chance  to get a real, natural spinel when you visit Chiang Mai, at a price that is a bargain.

Some spinel gemstone from Shiraz Jewelry in Chiang Mai.

Thursday, 28 February 2019 01:04

Emerald


Color: Light green, yellow green, dark green
Hardness: 7.5 - 8 Mohs
Specific Gravity: 2.67 - 2.78
Refractive Index:  1.576 - 1.582


Emerald derived its name from Smaragdos which means 'green stone'.Its green is incomparable, and is therefore called 'emerald green'.

Only the finest qualities are transparent. Often clouded by inclusions (liquid or gas bubbles, cracks, and crystals). These are not necessarily classified as faults, but are evidences as to the genuineness of the stone as compared with synthetic and other imitations. Because most emeralds are highly included, their toughness (resistance to breakage) is classified as generally poor.

Treatments
Most emeralds are oiled in order to fill in cracks so that clarity and stability are improved. The use of oil is traditional and largely accepted by the gem trade.

Thursday, 28 February 2019 00:19

Diamond


Color: Colorless, yellow, brown, green, blue, reddish, black
Hardness: 10 Mohs
Specific Gravity: 3.47 - 3.55
Refractive Index:  2.417 - 2.419


In simple word, diamond is carbon. A solid form of carbon with the highest hardness of any natural material on earth. Most natural diamonds are between 1 billion and 3.5 billion years. But only 20% of all diamonds can be used for jewelry, the remaining 80% are used in industry.

How valuable is my diamond?
You'd probably have heard about "4 Cs", they are: color, clarity, cut, and carat (weight). The value of your diamond is measured against these Cs.  

 

The Gemological Institute of America (GIA), has a system of color grading using letters starting at D. The highest quality color grades are D, E, and F.

A clarity grading system also has been devised by GIA. They are: Flawless (F), Very Very Slightly Imperfect (VVSI), Very Slightly Imperfect (VSI), Slightly Imperfect (SI), and Imperfect (I).

Thursday, 28 February 2019 00:05

Amethyst


Color: Violet, pale red-violet
Hardness: 7 Mohs
Specific Gravity: 2.63 - 2.65
Refractive Index:  1.544 - 1.553


Amethyst is the birthstone of February. It is the most highly valued stone in the quartz group. Amethyst is often associated with bringing luck, ensures constancy, and stability.

Color
You will most probably recognize amethyst from its beautiful purple color. But the gemstone color actually can range from a pale red violet to a deep purple that looks like blue or red. Some amethyst may lose some color in daylight.

Source
Amethyst can be found in every corner of our earth. As mentioned earlier, it is composed of quartz, which is the second most abundant material in the earth's crust. While they can be found anywhere, the most important deposits are in Brazil, Uruguay and the Malagasy Republic.

How to Buy Amethyst
When looking to purchase amethyst, here are some suggested steps:

First, visit a jeweler who is trusted and reputable to ensure that you get the best information about the gemstone.

Second, check the color. A bright deep purple color is most desirable. Avoid white stripes or layers of color, brownish or rust colored tints. Too deep a purple will make the stone look black in certain light condition.

Third, look at the clarity. Visible inclusions will reduce the value of the amethyst.

Since amethyst is relatively abundant, the price usually is inexpensive. Visit our store at 170 Thapae Road, Chiang Mai to view some beautiful and top quality amethysts.

Sunday, 25 August 2019 09:14

Nat Wat Home Cafe | Around Chiang Mai

Chiang Mai is located in the mountaineous region of Northern Thailand. It is rich in culture everywhere you go. But while on the trip to Chiang Mai and you're feeling hungry, don't miss this the opportunity to visit Nat Wat Home Cafe.

Located on 330/2 Charoenrat Road, Watket district of Chiang Mai, this cafe offers great value for money. Our team members have personally visited the cafe few times, and we love the food and the coffee. It's mixture of modern and loft style with nice and spacious airy space around. If you decided to go there, the best way is to take any ride-sharing app like Grab.

 A review from TripAdvisor user, mrt103 :

Best western breakfast in town. Really inventive breakfast menu with amazing presentation and attention to detail. The chef has a really good grasp of western cuisine and what flavours work well together.

Here is a video to visualize our experience at Nat Wat Home Cafe.

Monday, 25 February 2019 11:27

Ruby


Color: Varying red
Hardness: 9 Mohs
Specific Gravity: 3.97 - 4.05
Refractive Index:  1.766 - 1.774


Ruby is named because of its red color. The red color varies with the individual deposits, so it is not possible to determine the source area from the color, as each deposit yields various tones.

The designation "Burma-ruby" or "Siam-ruby" is erroneous, and refers more to quality than origin. The most desirable color is "pigeon's blood", pure red with a hint of blue.

All natural rubies have imperfections in them, including color impurities and inclusions of needles known as 'silk'. We use these needle inclusions in rubies to distinguish them from synthetics. It is extremely common and acceptable now that almost all rubies are treated in some form, with heat treatment being the most common practice.

 

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