Which gemstones are subject to certification?

When, with great joy and anticipation, we finally buy a piece of jewelry with a colored gemstone or diamond, we always wonder if the stone matches its characteristics. Does this diamond really weigh 1 carat, as the seller said?

There is a certificate to prove the origin and quality characteristics of diamonds and colored gemstones. This article tells you what certificates are provided for which stones and which laboratories you can trust.

Two groups of stones subject to certification:

Diamonds and colored gemstones

What is the best certificate for Diamonds ?

The GIA (Gemological Institute of America) is a non-profit organization that develops and implements quality standards for diamonds and is rightfully considered the most reputable gemological laboratory in the world. They provide the best certifications for any diamond. It was the GIA that created the diamond grading system, on the basis of which national standards have been developed around the world.

As a result of the examination of each diamond, GIA experts get the exact geometric parameters of the stone, assess the quality of cutting and polishing, its color and clarity, as well as the presence of fluorescence.

If your diamond jewelry was provided with a certificate from GIA, you can be sure of its origin and the characteristics described in the certificate.

It is worth mentioning that the price of a diamond at the Rapaport price list is also influenced by the company that issued the certificate. As a rule, AGSL-certified diamonds are sold at a considerable discount from the Rapaport price list because their color and clarity scales are lower than those of GIA, HRD and IGI. That is, AGSL "overestimate" the characteristics of the stone, so diamonds with certificates from these laboratories get lower color and clarity characteristics when they are evaluated by the GIA, HRD or IGI, which consequently affects their price.

What is the best certificate for colored gemstones ?

For colored gemstones we distinguished three of the most reputable: GRS, SSEF and Gubeline.

1) GEMRESEARCH SWISSLAB Gemological Research Center (GRS)

Gemological reports issued by the certification laboratories of GRS Gemresearch Swisslab AG are some of the most authoritative supporting documents for commercial transactions with high-grade gemstones.

Gemological services in the list of GRS works include diagnosis of a jewelry stone, nature of origin, methods of enhancement, for some gemstones the definition of region of origin is provided, as well as characterization of belonging of some jewelry stones to higher quality groups, such as "PIGEON BLOOD" and "SCARLET" for rubies, "ROYAL BLUE" and "CORNFLOWER" for sapphires, "OLD MINE / MUZO GREEN APPENDIX" for emeralds, "SUNRISE" and "SUNSET" for padparadscha, "HONEY-COLOR" for chrysoberyl, "PARAIBA-COLOR" and "NEON-COLOR" for tourmaline-elbaite.

2) One of the leading authorities in the field of colored gemstone authentication is the Gübelin Gem Lab.

Its main specialty is the origin of stones, which can be determined by their unique visual characteristics. Gubelin's gemstone rating takes into account three factors: quality, rarity and importance, where quality is the most important factor. It marks visual aspects such as color, clarity/transparency and shape. Rarity evaluates the type of gemstone, its weight, and any treatments used to enhance the gemstone. Clarity, transparency, and shape describe the uniqueness of the gemstone and its ability to stand out.

3) Another reputable gem certification center is the Swiss Gemological Institute, or SSEF (Schweizerische Stiftung für Edelstein-Forschung).

All gemologists who work in the laboratory have a scientific degree and a special gemological education, have great experience and a high level of knowledge.

The laboratory is equipped with the most modern analytical equipment. This guarantees that the authenticity of gemstones, their provenance and possible processing can be verified using scientific methods of analysis.

The laboratory offers its services to both private and corporate clients. Because the laboratory's analytical results are reliable and its experts are independent, it has received international recognition.

What is in the certificate?

The results of the analysis and evaluation of natural diamonds, synthetic diamonds, colored gemstones and pearls are accompanied by a separate type of GIA certificate.

Diamond Grading Report is the main type of GIA certificate that contains a 4C grade (carat grade, color grade, clarity grade, cut grade) diagram of clarity characteristics and a graphic representation of the proportions of the stone. This report includes diamonds of 0.15 carats and above:

D-Z color natural diamonds - Natural Diamond Grading Report,

Natural Colored Diamonds - Colored Diamond Grading Report, Artificial Diamonds - Laboratory-Grown Diamond Grading Report.For natural colored diamonds, there is a certificate that specifies the origin and structure of the color.

The GIA provides three types of certificates for colored gemstones and pearls:

Identification Report - for colored stones and pearls,

Identification and Origin Report - for colored stones,

Identification and Classification Report - for pearls.

The Identification and Origin Report is available only for rubies, sapphires, emeralds, Paraiba tourmalines, red spinels and alexandrites.

How to avoid counterfeiting?

One of the most important documents for any gemstone (diamond, ruby, emerald, or sapphire) is its certificate. It is true that its presence, especially if it is issued by a prestigious gemological laboratory, may slightly increase the price of the crystal, but it also reduces the risk of being cheated, so the buyers who want to be sure of the quality and authenticity of their sparkling gems order certificates from reputable laboratories (GIA, GRS, SSEF, Gubelin etc.) first of all. The certificate has several degrees of protection, such as micro-printing, watermarks, holographic image. You can check the conformity of the certificate by entering its number on the official GIA, GRS, SSEF and Gubeline website.

A certificate from a world-renowned laboratory for a diamond, ruby, emerald or any other stone not only confirms the characteristics of the stone, but also shows the buyer that the seller is ready to do business openly.

Certifications of which laboratories does Kantor Jewelry provide?

Kantor Jewelry works exclusively with reliable and reputable laboratories of world renown (GIA, GRS, Gubelin, SSEF, GFCO, AIGS, LOTUS).

When it comes to diamonds we work only with natural white and color diamonds certified by the independent Gemological Institute of America (GIA). This organization evaluates gemstones and sets strict international quality standards for the industry.

The GIA certificate number is engraved on the diamond, written on the paper certificate and can be found on the laboratory's global database. Using a magnifying glass, you can check the number on the stone against the documents. This is a guarantee of the quality and authenticity of your diamond.

Unique jewelry as an investment

As a type of alternative investment, investing in art, including jewelry, has its own unique advantages and characteristics. The advantage of jewelry as an object of investment is their rarity and non-renewability, which guarantees their high value.

Is it safe to buy custom jewelry online?

What should I do to buy jewelry online safely? in this article we will talk about what you should pay attention to when buying precious jewelry in online stores

What does the price of gem-stones depend on?

Gemstones are one of the categories of goods in which the price of individual items may vary dozens or even hundreds of times.In this article, we will look at how the price of jewelry is made up, what determines the price for a certain kind of mineral, and what the range of prices within this kind of mineral is.

What is tourmaline? It’s value and uniqueness

The following article will tell you about what tourmaline is, how tourmaline prices are determined, what colors and varieties it comes in, and will also help you to figure out which tourmaline is right for you.

What is a cut and how does it affect the value of a gemstone?

The following article will tell you about the types of the faceted cuts and how they affect the value of your gemstone, and will help you figure out which cut is right for you.

Birthstones

The following article will tell you about the birthstone of each month and will reveal their symbolic meaning.

Diamond Foundry plans to eliminate natural diamonds from the market: An expert opinion on whether it is possible or not

In this article, we will analyze how real such prospects are and what will actually happen to the diamond market.

August birthstone

In the following article we will look at the history of the peridot, its cultural and spiritual significance, and its use in jewelry. This article will be of interest to anyone born in August.

January birthstone

In the following article we will look at the history of the garnet, its cultural and spiritual significance, and its use in jewelry. This article will be of interest to anyone born in January.

September Birthstone

In the following article we will look at the history of the sapphire, its cultural and spiritual significance, and its use in jewelry. This article will be of interest to anyone born in September.

June Birthstone

In the following article we will tell you about the history, symbolism and meaning of pearls in the world of jewelry. You will learn what kinds of jewelry pearls look best in. This article will be of interest to those born in June.

Ring for engagement

In the following article, we will look at some aspects of an engagement ring and how to choose one.

Star sapphire

In the following article we will tell you about the history, symbolism and meaning of star sapphire in the world of jewelry.

Green diamond

In the following article you will learn how green diamonds are mined, what makes them rare, and how prices are formed.

How to tell if diamonds are real

The following article will tell you how to distinguish a real diamond from a fake, as well as what kind of stones can be used as substitutes for diamonds.

Ruby stone

In the following article you will learn about the history of the ruby, its characteristics, and its symbolic meaning. This article will help you choose the perfect ruby for you as well as tell you how to properly care for this gemstone.

White sapphire

In the following article we will look at white sapphire, its cultural and spiritual significance, and its use in jewelry.

Blue Sapphire ring

In thе following article, we will talk about the history of blue sapphire, its value and magical properties, as well as who will suit a ring with this stone.

Tanzanite

In the following article we will talk about tanzanites and compare this stone with a diamond.

Green gemstones

In the following article we will look at different kinds of green precious stones, their cultural and spiritual significance, and their use in jewelry.

Alexandrite stone

In the following article, we look at the history of alexandrite, its cultural and spiritual significance, and its use in jewelry.

Pink sapphire

In this article we will tell you about the properties of pink sapphires, where they are mined, what shades they come in, and which pink sapphires are considered more valuable.

May Birthstone

In this article, you will learn about the emerald, which is the birthstone of May. We will tell you about its history, its symbolic meaning, and the price of emeralds.

How much should you spend on an engagement ring?

In the following article we will talk about how much to spend on an engagement ring and exactly how expensive it should be.

All about jewelry appraisal

In the following article, we will tell you everything you need to know about jewelry appraisal.

The largest diamond in the world

In the following article we will tell historical facts about some of the most popular diamonds in the world.

What is a garnet?

In the following article, we've compiled some frequently asked questions about pomegranates to help you understand them.

White sapphire - the value, rarity and value of this stone

Sapphires are mostly known as blue stones, but there are also white ones, they are unusual in nature, they are often confused with a diamond, but there are huge differences between them. However, white sapphires have incredible beauty and charm.

History of diamonds. How the first diamond was discovered

This article will tell us when diamonds were first used to create jewelry. By tracing the history of diamonds, we can get a better understanding of buying diamond jewelry.

Diamond colors

In this article we will tell you about the diamond color scale. Colored and white diamonds are graded using different scales.

Color change of sapphire compared to alexandrite

In this article we will look at the difference between such stones as sapphire and alexandrite, what is the color difference between these two stones, and which is more unique and rare

December stones – TURQUOISE, BLUE TOPAZ AND TANZANITE

This article will be interesting for those born in December. We will tell everything about turquoise, blue topaz and tanzanite, and take a closer look at their role in modern jewelry.

Garnet

To help you understand what a garnet gemstone is, we've compiled some of the most frequently asked questions about garnets and spelled out the answers in this article

Carat in jewelry

In this article we will tell you what carats are and what they are for and how to determine the weight of precious stones.

The Seven Keystones of the World's Largest Diamond

In this article, we will tell you about a unique untreated colorless diamond weighing 3,016 carats and 10.1 centimeters high. Seven magnificent base stones were created from this powerful stone.

The Rare Star Ruby – value, meaning, rarity

In this article, we will consider the features of the star ruby, its rarity.

Jewelry as a gift

In this article, we'll take a look at the top 10 reasons why jewelry makes an excellent gift choice.

What are TW, CTW (Carat Total Weight) of a Diamond?

In this article, we'll look at what the total weight of a CTW diamond means and why it's important when choosing jewelry.

Ruby stone – meaning, benefits and facts

In this article, we will look at the meaning of ruby, its benefits, and present some interesting facts about this stone that attracts the attention of many jewelry lovers.

What are the rarest diamonds?

In this article we will look at the different types of colored diamonds, their hues, and find out how prices are formed.

Different types of rubies

In our article, we will look at the various sources of rubies, their possible forms and specific attributes. We will also discuss the differences between rubies and pink sapphires and look at their similarities and differences. So hold your hand and dive into the world of magnificent rubies.

February Birthstone

In this article, we will talk about the birthstone of February - amethyst. Its symbolism, characteristics and use in jewelry

The Enchanting Allure of Pink Diamonds: A Precious Rarity

In this article, we will look at the history of pink diamonds, their rarity and their use in jewelry.

Aquamarine Jewelry: Captivating Beauty from the Depths of the Sea

In this article, we will explore the allure of aquamarine jewelry, its history, characteristics, and why it continues to be a popular choice for those seeking elegance and sophistication.

The Timeless Appeal of Engagement Rings for Men

In this article, we explore the rising trend of engagement rings for men and shed light on the significance and style of these timeless tokens of love.

The Enchanting Elegance of Blue Diamond Rings

In this article, we explore the mesmerizing charm of blue diamond rings, their origin, characteristics, and why they have become such a sought-after choice for those seeking unique and exquisite jewelry pieces.

A March Birthstone of Tranquility and Elegance

This article delves into the fascinating history, symbolism, and properties of the March birthstone, celebrating its timeless allure and significance

Exploring the Allure of I-Colored Diamonds

This article delves into the unique characteristics and appeal of I-coloured diamonds.

Emeralds and Other Green Stones

In the following article, we will explore the fascinating world of emeralds and other green gemstones and examine their significance.

G-Color Diamonds

In this article, we will explore the world of G-color diamonds and find out what qualities make them popular among those who seek not only beauty but also budget savings.

World of Yellow Gemstones

In this article, we will explore some of the most exquisite and revered yellow gemstones, their characteristics, meanings, and uses.

April Birthstone

In this article, we delve into the captivating world of the April birthstone, exploring its history, meaning, and significance.

November Birthstone

In this article, we will explore the fascinating world of November's birthstones, topaz and citrine.

Diamond Band Rings

In this article, we'll explore the allure and significance of diamond band rings, from their history to their enduring popularity.

Pigeon Blood Rubies

In this article, we will explore the fascinating world of pigeon blood rubies, delving into their history, characteristics, significance, and more.

World of Blue Gemstones

In this article, we will embark on a journey through the mesmerizing world of blue gemstones, exploring their characteristics, origins, symbolism, and popular uses.

The Timeless Elegance of Emerald Earrings: A Gemstone Treasure

In this article, we'll look at the world of emerald earrings and discover the mystique and elegance they bring to any ensemble.

Cornflower Blue Sapphires

In this article, we will look at the captivating world of cornflower blue sapphires, exploring their origin, significance and appeal to collectors and admirers.

Sphene - The Radiant Gemstone Unveiling Nature's Kaleidoscope

In this article, we will take a journey into the mesmerizing realm of sphene, exploring its origin, unique properties and what makes it so appealing to gemstone lovers and collectors.

The Art of Bespoke Jewelry Design

In this article, we delve into the captivating world of bespoke jewelry design, exploring the intricacies that make each piece a one-of-a-kind masterpiece.

Didn't find the one you were looking for?

Send us a request for a personalized selection of the gemstone and we'll contact you soon for more details