It's trouble, how can you call it trouble when you get a baby?

When Zhang Nan hung up the phone, a few people on the side heard the conversation between the two just now, and they couldn't turn around for this "trouble" all of a sudden.

"Questions?"

It was Yasuko Sawaguchi who was asking, and she didn't understand either.

Zhang Nan nodded and said, "It's trouble, it's a big trouble!"

Why?

“... Brown is a jewelry appraiser and labourer, and his thinking is from a practical point of view, to make each gemstone the most perfect, and to make it the most economically valuable, whether it is to be sold or not.

Now Colombia's high-quality emerald deposits are almost exhausted, because of its own brittle and cracked material, most of the emerald rough produced in Colombia can only be polished into gems below 0.5 carats, with the most 0.23 and very few that can be polished more than 2 carats.

As for the auction company, the quality is passable, the weight is greater than 5 carats can be auctioned, or the more important auction, 5-10 carat specifications of high-quality emeralds in the top market circulation is the largest.

As for the emeralds that can be sold for the highest price, they are generally between 10 and 50 carats, which is not to say that larger emeralds cannot be sold at a high price, but that emerald crystals that have basically not been able to make such large finished gemstones have not appeared in recent decades.

There are big ones, but there are too many internal impurities and cracks, even if the crystals are large, they can't be processed into a large finished product..."

Unlike diamonds, color is an important factor in determining the value of emeralds!

The color grading of diamonds is simple and straightforward, and colorless diamonds can be judged directly by the degree of colorlessness, but the color of emeralds is much more complex.

Although this color can be reflected by purity, saturation and hue, it is difficult to decide which color saturation or hue of emerald is better, so in the emerald grading system, the color rating is more troublesome, and it often depends on feeling.

The color can be divided into five levels, the highest grade is bright green, which is the highest grade of emerald color, if you can also add "emerald" it is even more amazing, just now Zhang Nan made this judgment by feeling.

In fact, he is not very interested in emeralds, who made Zhang Nan a Chinese, and he only had a little preference for jadeite in his last life for green mineral babies.

But Jenny at home has a very high opinion of emeralds, so Zhang Nan also knows something about it, and this registration judgment is basically not wrong - this Brown knows this, because Zhang Nan's ability to appreciate the grading of emeralds is what he taught.

Emeralds, the greener, the better?

No, too much green can become black, bright green is the darkest color of all emerald green that can avoid opacity or excessive coloration, and the brightness of bright emeralds should reach excellent, and "emerald" is the highest level of vividness.

Under the bright green is bright green, bright green emeralds are slightly lighter than bright green in color, but they are also extremely popular, because bright green emeralds are really too few and too little, and money can't buy them!

The third tier is dark green, which is still quite rare and popular.

The fourth level is medium green, with a green saturation of 50% to 70%, followed by the fifth soft green, with a saturation of 20% to 40%.

As for the lower grade than soft green...

You don't have to buy it, it's not interesting.

In addition to color grading, there is also clarity grading: the clarity of an emerald is identified by the naked eye whether it is pure or not, which is different from the clarity of a diamond when viewed under 10x magnification!

Because the impurities contained in emeralds are generally more obvious than diamonds, they do not need to be observed with a magnifying glass. There is no significant difference in price between an emerald that is recognizable to the naked eye and an emerald that is recognizable as pure under 10x magnification.

In addition, color, clarity, weight, and cut have almost the same impact on price for diamonds, but emerald color has a significantly greater impact on price than clarity.

Therefore, in the grading system of emeralds, the clarity grading is relatively simple: the highest grade is flawless (FL/IF), which means that it is 100% free of impurities under the naked eye of a professional jeweler or expert.

Zhang Nan has good eyes, and the number of high-grade gems is terrifying, and now he can be regarded as a 100% expert.

He couldn't be wrong.

The second level is Very Fine Impurities (VVS), which are not visible to non-specialists, but can be observed by a professional jeweler or specialist.

The third level is very fine impurities (VS), which can be found by non-specialists on closer inspection.

The lower part is the fine impurities (SI), which can be found by non-professionals under careful observation, but does not affect the color and vividness of the emerald.

The fifth grade is impurities (I), which means that the impurities are obvious and have an impact on the color and vividness of the emerald.

Emerald also has a very distinctive classification, that is, "oil": oil immersion is actually to play a protective role in emeralds, because emeralds are flawed and cracked, so oil immersion is throughout the entire process from mining to sales.

When the rough stone is mined, the miner will dip the stone in the oil tank that he carries with him, so that the stone will be effectively protected from easy chipping in the subsequent cutting.

Modern mining emeralds, this oil is basically unavoidable, even if it is a top-quality emerald. It is nothing more than that the better the clarity, the less oil the emerald has, because there are no gaps to let the oil in.

A multi-split emerald, after being immersed in enough special oil, looks like the grade can be greatly improved to the naked eye!

Was emerald soaked in oil when it was mined in the early 18th century?

It's unlikely, and even if there is, it should have been eroded by the sea because of the gaps, and since it hasn't been eroded, the huge crystals that have been fished up this time are oil-free.

Bright green, flawless and oil-free, this piece of emerald is the top color, not to mention its terrifying block!

And the trouble is here, or big trouble!

In this regard, Zhang Nan smiled bitterly at the people next to him, and said, "It's because it's so big and perfect, Brown and I don't know what to do with it."

Is it in a museum? This is a fast crystal, not a relic, and that's not in our interest.

But what can be done with him?

It weighed two or three kilograms, and Brown didn't even have to see the real thing to cut this guy with a design, let alone how to cut it to perfectly reflect its best interests.

This is a big problem, how can you deal with it?"

Well, Nicole's 407.48-carat "star" yellow diamond is not something that ordinary people can hold, the same reason, two or three kilograms of flawless, bright green emerald, how to deal with it, where to hang?

Trouble, big trouble!

The trouble of happiness, no matter how you cut it, is a waste, and it is even more troublesome to leave it alone, and other people are equally dumbfounded by their big eyes.