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.
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.
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.
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).
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.
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.
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.
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.
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.
Center Stone: Natural Blue Sapphire 1.75ct
Side Stones: 14 x Diamonds 0.32ct
Metal: 18K White Gold
Size: Free Resizing
Since 1982 all Shiraz's engagement rings are made by hand, including this special one. Made as a replica of England's famous royal engagement ring, it is trully a ring you can expect to last and a head turner. The side diamonds around the center stone are individually selected and carefully placed by hand. Visit our shop to inquire.
Note that the blue sapphire's weight may vary. Metal options are yellow and white 18K gold. Large sapphires are rare and they are sometimes named in the same way as famous diamonds.
Color: Colorless, yellow, brown, orange, red, violet, blue, green
Hardness: 6.5 - 7.5 Mohs
Specific Gravity: 3.90 - 4.71
Refractive Index: 1.777 - 1.987
Records shown that Zircon has been used as gemstone since the beginning of history. Carved zircons have been recovered from some of the most ancient archaeological sites. Because of its high refractive index and strong dispersion, it has great brilliance and intense fire. It is brittle and therefore sensitive to knocks and pressure.
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This is a Blue Zircon from Thailand. The primary sources for zircon are Cambodia and Thailand, where it is found as waterworn pebbles colored reddish-brown to yellowish-brown. The pebbles are heated in primitive coal-burning ovens, sometimes several times. The treatment causes a color change, producing blue, golden-yellow, and colorless material. Bangkok is a cutting and heating center for zircon. Low-type zircon of gem quality is found in Sri Lanka, as worn pebbles in the gem gravels. (Source: Gems and Jewelry, Joel Arem, 1975). #bluezircon #pebbles #heattreatment #thailand #cambodia #gemsandjewelry #gemscutting #chiangmai #shirazjewelry
Deposits and Mines
Deposits are mostly found in Cambodia, Burma, Thailand and Sri Lanka. Bangkok is the cutting and heating center for zircon.
Naturally most zircon are gray-brown and red-brown. Heat treatment changes to colorless and blue Zircon. Occasionally red or orange stones appear on the market, but these colors are natural and not produced by heating.
What can you do with it?
Anything from ring, pendant, earring, and bracelet will look beautiful with zircon. The refraction index of zircon is very high. If cut as round brilliants, zircons have steely brilliance and dispersive color. These stone can easily be mistaken for diamonds at first glance. However, zircon is very brittle and susceptible to damage when worn in a ring. Small zircon may be used as side stones in jewelry, in place of diamond chips.