SPECIALISTS IN CERTIFICATED DIAMONDS WITH THE BEST QUALITY, ADVICE AND PRICE
Each diamond is unique and unrepeatable, as unique and unrepeatable is the time to give or buy it. In Quera we have been diamond specialists for over 130 years, we work with the main international gemological institutes to offer official certification and the best quality, advice and price.
THE DIAMONDS
Each diamond is unique. No gemstone can be compared to diamonds. It is found in the most remote places on earth and the mere fact that it can be created is already a miracle. It takes practically a ton of rock and a multitude of geological variables to get less than half a carat of a rough diamond. Diamonds are formed under conditions of high pressure and extreme temperature, at depths of more than 140 kilometers within the Earth's mantle, and reach the surface through vents caused by volcanic eruptions. A rough diamond is generally in the shape of an octahedron, like two pyramids joined at the base with four facets each.
Diamond is the hardest stone that exists. Its name comes from the Greek "Adamas" which means invincible, unalterable, indomitable. Among other things, that is why it is called to be a "forever" stone.
THE 4 C
Being a natural phenomenon each diamond is unique. Diamonds are made in many sizes, shapes, colors and with various internal characteristics. The value of one or the other is based on a combination of factors. There is a systematic and internationally agreed way among jewelery professionals to evaluate these factors developed by the GIA (Gemological Institute of America). This scale establishes the use of four factors known in English as 4C: Cut, Color, Clarity & Carat.
THE 4 C
Being a natural phenomenon each diamond is unique. Diamonds are made in many sizes, shapes, colors and with various internal characteristics. The value of one or the other is based on a combination of factors. There is a systematic and internationally agreed way among jewelery professionals to evaluate these factors developed by the GIA (Gemological Institute of America). This scale establishes the use of four factors known in English as 4C: Cut, Color, Clarity & Carat.
CLARITY / PURITY
Because diamonds are formed inside the earth at high temperatures, sometimes there are particles of other minerals remaining inside, which is what we call inclusions. The gem has more quality when these inclusions are less visible.
There is a table to evaluate the purity of diamonds. It has 11 degrees of clarity, which from low to high would be:
Many inclusions and defects are too small to be seen by anyone other than a trained and formatted diamond grader. At first glance, a VS1 and an SI2 diamond may look exactly the same, but these diamonds are quite different in terms of overall quality. This is why expert and accurate evaluation of clarity is extremely important.
CUT
The quality of the cut is crucial to the beauty and final value of the diamond. Each angle and each facet affects the amount of light that returns to the human eye.
The most common diamond shape used in jewelry is the round, which we call glitter. A well-cut shine should have 58 facets (57 excluding the butt), regardless of size.
The cut is evaluated with a table with 5 levels: Excellent, Very Good, Good, Fair and Poor.
All other diamond shapes are known as fantasy shapes. Depending on the way the diamond is cut it takes different names. If it is rectangular it is called a baguette, if it is a square princess, in the shape of a heart, a pear ...
CUT
The quality of the cut is crucial to the beauty and final value of the diamond. Each angle and each facet affects the amount of light that returns to the human eye.
The most common diamond shape used in jewelry is the round, which we call glitter. A well-cut shine should have 58 facets (57 excluding the butt), regardless of size.
The cut is evaluated with a table with 5 levels: Excellent, Very Good, Good, Fair and Poor.
All other diamond shapes are known as fantasy shapes. Depending on the way the diamond is cut it takes different names. If it is rectangular it is called a baguette, if it is a square princess, in the shape of a heart, a pear ...
THE WEIGHT
The weight of the glitter is measured in a unit called carat and is directly related to the size of the stone. 1 carat (ct) = 6.5 mm in diameter.
Value, however, is not strictly proportionate to its weight. The concept is simple, large diamonds are rarer than small ones. The scarcer something is, the more valuable it is. So a larger stone not only costs more for the carats it has, but the percentage per carat is higher. A 1 carat diamond weighs the same as four 0.25 carat diamonds. But even if the other quality factors are the same, the larger diamond is worth much more than the sum of the four smaller diamonds.
Each carat can be subdivided into 100 points. This allows for very accurate measurements.
THE COLOUR
The most valued color is non-colour. The closer a colourless diamond is, the greater its value. Despite the fact that we are most accustomed to seeing them, colorless diamonds are extremely rare. The color in diamonds is caused by impurities and structural defects in their formation. We find yellow, brown, black, orange, pink, blue ...
Leading diamond certification institutes, colour gradients with a table ranging from "D" to "Z". Each letter represents a range of colours based on the tone and saturation of a diamond. The "D" is the highest expression in the range of white and colorless, while the "Z" is when the diamond has a very marked color, which also makes it valuable for its rarity. Intermediate terms are the most common.
THE COLOUR
The most valued color is non-colour. The closer a colourless diamond is, the greater its value. Despite the fact that we are most accustomed to seeing them, colorless diamonds are extremely rare. The color in diamonds is caused by impurities and structural defects in their formation. We find yellow, brown, black, orange, pink, blue ...
Leading diamond certification institutes, colour gradients with a table ranging from "D" to "Z". Each letter represents a range of colours based on the tone and saturation of a diamond. The "D" is the highest expression in the range of white and colorless, while the "Z" is when the diamond has a very marked color, which also makes it valuable for its rarity. Intermediate terms are the most common.
CERTIFICATION
Buying a diamond must be a rigorous, thoughtful, objectionable and evaluated decision by accredited professionals. The value of diamonds depends on the combination of several tangible and valuable variables. Super deals, promotions or bargains do not exist on high quality diamonds. Fear of diamonds sold by unknown platforms or jewelers without official training or certification. Also doubt their own or third-party certifications that they cannot verify are officially made by the world's three major gemological institutes: GIA, HRD and IGI.
TRUST
Buying a diamond must be a rigorous, thoughtful, objectionable and evaluated decision by accredited professionals. The value of diamonds depends on the combination of several tangible and valuable variables. Super deals, promotions or bargains do not exist on high quality diamonds. Fear of diamonds sold by unknown platforms or jewelers without official training or certification. Also doubt their own or third-party certifications that they cannot verify are officially made by the world's three major gemological institutes: GIA, HRD and IGI.
TRUST
Buying a diamond must be a rigorous, thoughtful, objectionable and evaluated decision by accredited professionals. The value of diamonds depends on the combination of several tangible and valuable variables. Super deals, promotions or bargains do not exist on high quality diamonds. Fear of diamonds sold by unknown platforms or jewelers without official training or certification. Also doubt their own or third-party certifications that they cannot verify are officially made by the world's three major gemological institutes: GIA, HRD and IGI.
QUALITY
The quality of all the materials is an unbeatable premise in all the jewels that come from the different boutiques of Quera. All diamonds are certified and always delivered with their guarantee of quality officially accredited with value all over the world.
All the diamonds used by the Quera jewelery workshop are of minimum quality VVS-VS and F-H color, to guarantee the highest quality.
TRADITION
Diamonds are special gems for life and the time to give them as well. For this reason, it cannot be failed and the highest quality guarantees must be guaranteed. Quera has a long history of more than 130 years working in this sector.
TRADITION
Diamonds are special gems for life and the time to give them as well. For this reason, it cannot be failed and the highest quality guarantees must be guaranteed. Quera has a long history of more than 130 years working in this sector.
INNOVATION
These traditional techniques and the experience acquired over the years are combined with perfection using the latest in technological instruments that are updated year after year and which help to achieve perfection in all kinds of details and finishes, as well as to provide customers the speed and service worthy of their trust.
PROFESSIONALITY
Quera is a family business with more than 130 years of history that works in alliance with the main diamond institutes in the world: the GIA, the HRD and the IGI. In addition, Mariona Quera, the sixth generation of the family and the jewelry manager of Quera, has graduated in Gemmology and has the certification of the main center in the world in this sector, the Gemological Instutite of America.
PROFESSIONALITY
Quera is a family business with more than 130 years of history that works in alliance with the main diamond institutes in the world: the GIA, the HRD and the IGI. In addition, Mariona Quera, the sixth generation of the family and the jewelry manager of Quera, has graduated in Gemmology and has the certification of the main center in the world in this sector, the Gemological Instutite of America.
PRICE
This long experience also means that you can buy them directly from the world's diamond stock exchanges, eliminating intermediaries. The professionals at the Quera jewelry department are familiar with the complex criteria used to select diamonds and guarantee the highest quality at attractive prices. Quera's diamond selection and classification tests exceed the most exhaustive guidelines of certification institutes and go beyond 4C.
THE KIMBERLEY PROCESS SCHEME (KPCS)
The diamonds Quera works with in compliance with the Kimberley Process. This is an international certification treaty that regulates the trading of raw diamonds and seeks to eliminate conflicting diamonds from the global supply chain, while also helping to protect the legitimate trade of raw diamonds. To combat this, KPCS has developed a set of minimum requirements that each participant must meet.
THE KIMBERLEY PROCESS SCHEME (KPCS)
The diamonds Quera works with in compliance with the Kimberley Process. This is an international certification treaty that regulates the trading of raw diamonds and seeks to eliminate conflicting diamonds from the global supply chain, while also helping to protect the legitimate trade of raw diamonds. To combat this, KPCS has developed a set of minimum requirements that each participant must meet.
THE JEWELRY WORKSHOP IN PERE QUERA 1887
Once you have chosen the diamond you need to find the best frame for it to look in all its splendor. In a ring, in a pendant, in earrings, alone, accompanied ... There are many decisions that must be made and you have to know how to place them to get the most out of these unique gems.
In the more than 130 years of Quera history in the world of jewelery, the baggage and specialization that have been passed on from generation to generation have been acquired. All these traditional techniques and the acquired experience combine seamlessly with the latest technology instruments.
The Quera Jewelry Workshop controls all production processes while designing and creating your unique jewelry. A diamond is forever, but to guarantee this eternity, the highest guarantees of quality and the advice and the hands of qualified and experienced professionals are essential.
MARIONA QUERA, GIA GRADUATE
Mariona Quera, 6th generation of the family and a graduate of the Institute of GIA (Gemological Institute of America), the most prestigious jewellery institute in the world, is the head of the jewellery section at Quera. GIA is a non-profit organisation dedicated to research and training in the field of gemology and jewellery, founded in 1931 with the mission of protecting sellers and buyers of gems, establishing and maintaining standards for assessing gem quality.
MARIONA QUERA, GIA GRADUATE
Mariona Quera, 6th generation of the family and a graduate of the Institute of GIA (Gemological Institute of America), the most prestigious jewellery institute in the world, is the head of the jewellery section at Quera. GIA is a non-profit organisation dedicated to research and training in the field of gemology and jewellery, founded in 1931 with the mission of protecting sellers and buyers of gems, establishing and maintaining standards for assessing gem quality.
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