July 28, 2021

Red sapphire, emerald, tourmaline, tanzanite shopping tips

Each colored gem has a unique reason to be loved by the world. Some people like rubies because they want to have the same passion and unrestrained emotions as fire; some people like emeralds because green is the color of everything, bringing life and hope; some people like tourmaline because it has magical evil spirits and health care. The function of health.

It can be said that colored gemstones can bring a very personal choice to people of different classes and different preferences. Of course, this will inevitably make you feel confused about not knowing colored gemstones. I don't know how to choose.

Below, we will introduce you to the selection and identification techniques of several colored gemstones. I believe that after reading it, you can choose your favorite gemstone more confidently.

Red Sapphire Purchase Tips


When buying red sapphires, we must pay attention to their quality, because quality is the key factor affecting their value. At present, the domestic and international markets generally recognize the quality of red sapphire from the aspects of color, weight, transparency, clarity, and cut.

In terms of color, natural red sapphire cannot be expressed as a single spectral color, but has a dominant color and an auxiliary color.

In principle, the closer the color of the red sapphire is to the ideal spectral color, the higher its quality. For example, the Myanmar pigeon blood red ruby ​​and Kashmir cornflower sapphire are closer to the ideal spectral color, so they are the best of the red sapphires. Conversely, if the proportion of red sapphire color is greater, the color is less pure, the lower the color quality, and the lower the value.

It is worth mentioning that for sapphire, the ideal color is generally considered to be pure and uniform blue, but some sapphire with color-changing effect is also very rare and worth collecting.

In terms of weight, the particles of natural rubies are generally small, and it is rare to reach 1 carat, and it is extremely rare to be above 5 carats. The larger the ruby, the greater the price increase per carat, and the carat premium is much greater than the diamond. When purchasing, we should try to buy a large carat ruby ​​under other conditions.

Relatively speaking, sapphire production is more than ruby, a few carats, dozens of carats of sapphire can be seen, but more than 100 carats is very precious. Therefore, the price of natural sapphire is generally lower than that of ruby.

In terms of transparency and clarity, the more pure and transparent red sapphires, the higher the price.

For rubies, it is very difficult to be completely transparent, flawless, and crack-free. Under a 10x magnifying glass, ruby ​​always has such small defects or various inclusions. Therefore, the transparency and clarity requirements of ruby ​​naturally need to be Lower.

For sapphire, because the fairly pure and transparent sapphire is easier to find, the clarity and transparency requirements are therefore much higher than ruby. A truly good quality sapphire is generally required to be pure and transparent. If the clarity and transparency are not high, the price will be greatly affected.

In addition to the inherent quality of red sapphire, the quality of its cut is also an important factor affecting the overall value. The quality of the cut does not only affect the appearance, but also affect the color. High-quality red sapphire requires a moderately cut at the bottom. If the bottom is too shallow, the center will become a “dead zone” completely; if the bottom is too deep, it will affect the transparency, the proportion will be out of balance, and the mosaic will be affected. In these cases, the price will be greatly reduced.

In addition, red sapphire with a star effect should be evaluated separately. In addition to the ideal color, uniform color, flawless, fine polishing and other conditions, more important is the brightness, shape position, integrity and proportional relationship of the star line, these are important factors affecting the star red sapphire.

Of course, in addition to the quality evaluation of red sapphires from the above aspects, the judgment of true and false is more important. In general, fake red sapphire is divided into two cases.

One is to impersonate red sapphires with low-grade gems. These low-grade gemstones are free of the unique color and light properties of natural red sapphire, which can be observed by the naked eye and the instrument.

The second is artificial red sapphire. Natural red sapphire crystals are always surrounded by some other natural mineral crystals, which are often encased in red sapphire crystals to form inclusions. These inclusions have two major characteristics: one is an angular shape with an angular shape; the other is often arranged in a certain direction, intersecting each other at an angle of 60°. When viewed by the naked eye, it seems that the surface of the red sapphire has many filaments, which is an important symbol of true gemstones. On the contrary, inclusions may also appear in artificial red sapphire. Its inclusions are not various minerals, but bubbles. The appearance of bubbles is usually irregular, densely integrated, or isolated.

The above shopping skills can help us make judgments, but the most reliable one is to go to a qualified and reputable merchant to buy red sapphires. Of course, you must remember to obtain an identification certificate.

Minor Mistakes: Sapphire is not all blue

Among the corundum gems, except for the red, pink, and light red gems called rubies, other colors of corundum gems are called sapphire, so sapphire is not necessarily blue, such as yellow sapphires.

Emerald shopping tips

In the market, the evaluation criteria of emerald quality are similar to other gemstones, but also look at color, clarity, weight, cut, etc., but the primary factor is the color quality of emerald.

In terms of color, you can't simply think that the darker the color of the emerald is, the better it should be. First, you should see if the color is "positive". The so-called "color positive" means that the green color looks bright and pleasing to the eye. Of course, the more pure this green, the higher its value. In general, emeralds are better in green with blue and green with gray.

In terms of transparency, the clear, bright and crystal-clear emerald is the best, translucent is an ordinary product.

In terms of clarity, since the emerald's connotations and cracks are always very common and varied, the standard for the evaluation of emerald clarity is looser in colored gemstones. People call the emerald under the microscope "garden."

By studying the differences in "plants" in the emerald "garden", one can determine the origin of the emerald and even evaluate its value. Clear and unpretentious emeralds are extremely rare, and more than 3 carats of relatively clean emeralds are quite rare and expensive.

In the cut, the emerald texture is brittle and easy to be crushed by gravity, so the gemologist designed a unique emerald cut, which cuts the sharp corners of the four sides of the emerald rectangle into a flat shape. Some emeralds with low quality, poor transparency and light color will be cut into a dough. From this point, we can also judge the quality of emerald.

In the identification of true and false emeralds, we can distinguish the natural green gemstones similar to them by emerald characteristics, such as fluorite, green tourmaline, apatite, green sapphire, chrome vanadium-containing calcium aluminum garnet and artificial imitation Products and so on. Such as apatite, although there is a light green color, but its hardness is small, the refractive index is larger, and phosphorescence under ultraviolet light, these are very different from the characteristics of emerald.

Minor misunderstanding: the gems are very hard, not afraid of falling

In general, gems are harder than ordinary stones, but they are not equal to them. For example, emerald has a higher hardness, which only indicates that it is more resistant to scratching, but it is more brittle and easily cracks when impacted.

Tourmaline shopping skills

When choosing a tourmaline, choose a crystal clearer with a poor fog or opacity that is of poor quality. In terms of color selection, red, blue, and green are preferred, and uniformity is required. If you choose a tourmaline necklace or bracelet, the color of each bead can be different, and it can be matched with red, yellow, blue, green, purple and other colors.

In the choice of clarity, because the nature of the tourmaline is brittle, it is prone to cracks, and the interior often contains a large number of inclusions. If there are many cracks and inclusions inside the tourmaline, its transparency, color, and fire color will be affected. Of course, if the interior of the tourmaline is very pure, it is a top grade and it is rare. Therefore, when choosing, try to choose internal clean.

In terms of cut and weight, a good cut should show the brightness and fire of the tourmaline as much as possible. In addition, the value of tourmaline will increase geometrically with increasing weight. Of course, the same weight of tourmaline will vary greatly in value due to color, clarity, and cut.

However, while being able to judge the quality of the tourmaline, we should also know how to identify its true and false.

If we encounter the raw material of tourmaline crystal, it can be judged by the long column of the tourmaline mineral material, the longitudinal grain on the cylinder surface and the curved triangle on the cross section. These are easy to identify.

If it is a processed tourmaline jewelry, it is easy to be confused with other natural gemstones, synthetic gemstones and even colored glass. We are slightly more difficult to identify, but it can also be identified according to the three characteristics of tourmaline.

First of all, through the strong birefringence of tourmaline, it can be distinguished from topaz and synthetic spinel, because the bottom edge of the tourmaline can be seen to have obvious double shadow phenomenon.

Secondly, through the strong dichroism of tourmaline, it can be distinguished from olivine, tinted glass and garnet. For example, red tourmalines often exhibit red and pink dichroism, while green tourmalines show green and light green dichroism.

Finally, if the tourmaline is processed into an emerald step shape, then the direction of the long side can often see some tubular wraps or cotton batt, while observing the direction of the short side will reveal its darker color, which is due to the difference in tourmaline. The direction of light absorption is different. Using this feature, we can identify some synthetic imitations.

Minor Misunderstanding: Simply Pursue the Perfection of Tourmaline

Some consumers are cautious when choosing tourmaline, lest they buy a tourmaline with a hint of impurities or tiny cracks inside. In fact, the natural tourmaline must have imperfections, there will always be such defects, as long as it does not affect its external beauty.

Tanzanite shopping tips

Fifteen years ago, the popularity of the Titanic, the general audience was deeply attracted by the blue and crystal of the "heart of the ocean" worn by the heroine. However, this tanzanite from the foot of Mount Kilimanjaro in Tanzania, East Africa, has caused many people to think it is a sapphire.

It is precisely because the blue of tanzanite and the blue of sapphire are very similar, many consumers are easily confused. So how do we identify the two?

The easiest way is to distinguish between hardness and color. The sapphire has a Mohs hardness of 9 and the tanzanite is 6.5-7. Compared to sapphire, tanzanite is more colorful. Most sapphires are grayish or blackish, while tanzanite is more blue.

Compared with sapphire, tanzanite is much cheaper and more "big". The 1-2 carat sapphire is relatively large, and the tanzanite has more than a dozen carats. At the same time, most of the tanzanite is relatively clean and clear, and the impurities of sapphire are relatively more.

In addition, how should we evaluate the quality of tanzanite? It is generally accepted internationally that the Tanzanite Fund is rated according to the “5C” standard, that is, the higher the combined value of color, clarity, cut, carat weight, confidence, etc., the rarer the tanzanite, the higher the value. .

Since 90% of the world's tanzanite is distributed through members of the International Colored Gemstone Association (ICA), you should choose Tanzanite, which is darker in color and has the MarkofRarityTM logo (the logo of the Tanzanite Foundation). .

It is worth mentioning that the synthetic tollite made in Russia on the market is posing as tanzanite, and it is difficult to distinguish. Adding iron, vanadium, cobalt and other elements to the forsterite will make the original olive green appear blue-violet and become the "replacement" of tanzanite.

Therefore, if consumers intend to purchase a considerable price of tanzanite, they must let the seller show the authority certificate of gemstone inspection or go to the authority for inspection on the spot, otherwise they must purchase carefully.

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