Ratna jyoti Gem,Rudraksha Testing & Diamond Gradation Laboratory

Gemology Service

RJL Lab is Govt. Reg. Laboratory.
Pijush Nandi,Govt.Reg.Gemologist, W.B.,India
Gemologist Govt. Regd. No:-STVT6091010078
Laboratory Licence No:474/2010-2011 

The Ultimate Diamond & Gems Information Site:  https://www.ratnajyoti.com/
Phone & Fax:-03412668022,Mobile:-+91 9732150484, e-mail:- contact@ratnajyoti.com

At Frist you signup to www.ratnajyoti.com.Than you confarm your order & payment online/offline.than you send yours Gem to our address,than we Test & Grad That gem and we send gem with report to your address.

Laboratory Instruments :

Diamond Tester

Diamond & Gems  Weighting Machine

Diamond & Gems  Specific Gravity Tester Machine

Reflactive  Index Test Metter

Clarity Testing Machine

X-Ray for Rudraksha

CT Scanning for Rudraksha


Tempreature Test machine

Colour Testing Machine

Hardness Testing Machine

Measurement Testing Machine

Birefringence Testing Machine

Symmetry testing machine

Fluorescen testing machine

Polish testing machine

Chemical testing Machine

Cut Grade testing machine

 Lustre testing machine

 Pleochroism testing machine

 Luminescence testing machine

 Transparency testing machine

 Inclusions Tester Machine

 Gem inside Growth line testing machine

 Gem Species testing machine

 Naturality or Synthetic  testing machine

How RJL Grades Diamonds
People from all over the world send their diamonds to the RJ Laboratory for grading and analysis.

Grading Diamonds


Objectivity and independence are the hallmarks of all RJL reports and services, and RJL has elaborate processes in place to ensure a diamond anonymity through the grading process.

Weights and Measures

Diamonds are weighed with an electronic micro-balance that captures their weight to the fifth decimal place.

Grading Cut

verify & Grading cut
Grading Color

Since light source and background can have a significant impact on the appearance of color, the diamond color is graded in a standardized viewing environment. Color graders submit their independent opinions into the system.

Grading Clarity and Finish

Clarity is graded with 10x magnification under standard viewing conditions. The preliminary grader carefully examines the diamond to locate clarity/finish characteristics and evidence of any diamond treatments, such as fracture filling or laser drilling.

Depending on the diamond weight, quality, and the agreement of grading opinions, additional quality assurance process steps are also performed. More experienced staff gemologists may review all of the previous grading information and render independent clarity/polish/symmetry opinions. Grading results are finalized once there are sufficient agreeing opinions.

Astro Gem Testing Reports

RJL s Gemological Identification Reports assess the characteristics of a Astro-Gem (weight, shape-cut , Transparency,Lustre, Refractive Index,Specific gravity,Hardness,Species,Inclusions and color) and indicate any detectable treatments. The stone’s identity, whether it is natural or synthetic, and if it is a ruby, sapphire or emerald ect., geographic origin is provided.

Astro Gem Reports

RJL Astro Gem Identification Reports

These reports document the results of a full gemological examination of a material, identifying the material examined and detailing such characteristics as color, transparency, shape, cut, and dimensions weight . The full report states whether the material is natural or synthetic and if it has been treated to enhance its appearance by an identifiable treatment. The report also notes whether the material is a simulant with no known natural counterpart, or if it has been assembled from two or more separate components.


1.creating the D-to-Z color scale and Flawless-to-I3 clarity scale for diamonds
2.detecting irradiated yellow diamonds
3.determining the color of black cultured pearls to be natural
4.the first study of a new gem now known as tanzanite
5.the first report on faceted synthetic diamonds
6.identifying Naturl rubies, sapphire ,all type Gems & all type Rudraksha.
7.identifying glass-filled rubies & Gems
8.identifying synthetic & Plastik rubies , Gems & Rudraksha
9.detecting fracture-filled diamonds
10.evaluating the durability of emerald filling substances
11.distinguishing natural from synthetic diamonds
12.detecting synthetic moissanite, a popular diamond imitation
13.identifying the effect of fluorescence on diamond appearance
14.detecting diamonds decolorized by high pressure/high temperature (HPHT) treatment
15.detecting gem-quality synthetic diamonds created by chemical vapor deposition (CVD)
16.creating a comprehensive system for grading diamond cut quality


his guide defines the five essential characteristics of gemstone quality. By understanding these characteristics, you will be able to shop with confidence. Print this helpful information and take it with you shopping so you can make the best choice on a beautiful piece of gemstone jewelry.

The jewelry industry recognizes the highest quality gemstones by purity of their hue, the depth of tone, and the color saturation. The best value is in colors that include slight traces of other colors, are not too light or dark, and have a lot of saturated color. Ratna Jyoti offers some of the highest-quality colored gemstones available. Nearly all gemstones today, including Ratna Jyoti stones, have been treated to enhance their color. The most common methods of treatment are heating, nearly always seen . .


The beautiful color of a gemstone is its most defining characteristic, and many jewelers consider it to be the most important evaluation criterion. When deciding upon gemstone color, examine hue, tone, and saturation.


The most valuable gemstones are those that exhibit a pure color and only slight hues of other colors in addition to their primary color, as all Ratna Jyoti gemstones do. For example, Ratna Jyotis RUBY range in hue from slightly purplish-blue to slightly greenish-blue, pink sapphires always range from pink to slightly purplish-pink, and rubies range from slightly orangish-red to slightly purplish-red. With the exception of opals, variation in a gemstones hue will be called out in the gemstone details on the product detail page.


Tone represents the depth of color, ranging from colorless to black. Gemstone tone is described as light,medium-light,medium, medium-dark, and dark. Ratna Jyoti offers gemstones with the most sought-after tones that fall within the medium-light to medium-dark range. For all of our gemstone jewelry, you will find any tone variations are called out in the gemstone details.


Saturation, or color purity, refers to the degree to which the gem is free from brown or gray hues. The most desirable gemstones, which show little gray or brown, are often described as having vivid or strong color saturation. Generally, the levels of color saturation will not be called out in the product details because the gemstones in our jewelry are hand-selected for their vivid colors.


The carat weight of a gemstone is not necessarily an accurate gauge for gemstone size. To help you judge the size of a gemstone, Ratna Jyoti lists the diameter of the gemstone when viewed from above - since if the gemstone is set in jewelry; this is the only part of the gemstone that is visible.

Different Densities

The carat weight of a gemstone does not necessarily allow you to accurately envision the size of the gemstone. Different gemstones have different densities (mass per unit volume), so two gems that appear to be the same size may actually have very different weights. For example, a old mines burma ruby is more dense than a diamond, so a 1-carat old mines burma ruby will look smaller than a 1-carat diamond.

Always request the dimensions of a gemstone to ensure that the majority of the gemstone weight will be visible when set in the setting.

To help you envision the gemstones actual appearance, we at Blue Nile provide the diameter dimensions (for round) or length and width (for other shapes) of a given gemstone. You can even click the zoom button to see a closer look at any piece of gemstone jewelry.


Almost all gemstones contain inclusions. Even those most highly prized have at least some inclusions. Flawless gemstones are very rare and very expensive. The best value is found in gems that are lightly to moderately included, like those in Ratna Jyoti gemstone jewelry.

Identifying Marks

Because gemstones form under unique circumstances, each individual gemstone is comprised of a combination of trace minerals, which create a unique set of identifying marks or inclusions. Inclusions will not necessarily detract from the beauty or desirability of a colored gemstone.

What to Look For

When considering a colored gemstones clarity, you should measure your expectations against the standard for that variety of gemstone. Some varieties of colored gemstones, ruby, tend to have a higher rate of acceptable inclusions.

Clarity is an important factor in comparing quality colored gemstones. Even opaque opals can have milky inclusions that will affect their iridescence and color play. In general, the best values are available in gemstones that are moderately included. Exceptional gemstones with few or no inclusions are available, but they can command extravagant prices.
N.B:-(1) Mr.Rajroop Tank (Jaipur,India),Mr. Bobwison (U.S.A), the World Famous Gems Therapist say that- Real Gems must have differents types of Minarel Signs-Like Air bubles/Sign of Layer/Feathers/ cLODS/SPORTS/Fracture etc. These are not Harmful..
(2) Price of a Gem various according to its SIZE,COLOUR,CLARITY,MINES,CARAT & QUALITY.


Unlike diamonds, with gemstones there isnot an IDEAL cut geometrically configured for maximum brilliance. But a high-quality gemstone cut is one that presents the most even color, exposes the fewest inclusions, and displays the majority of the gemstone weight when set in jewelry.

Colored gemstones are generally cut to maximize the beauty of their color. To recognize quality in the cut of a gemstone, there are several points to consider.

What to Look For

A good cut showcases the gemstones color, diminishes its inclusions, and exhibits good overall symmetry and proportion. Because gemstone color can vary, there are no hard geometrical standards when it comes to maximizing brilliance or color. Gemstones, especially rarer ones, are sometimes cut for size without regard for their color. For example, when corundum varieties such as sapphire and ruby are cut for maximum weight rather than beauty, they may display banded colors or streaks.Ratna Jyoti sells only the finest quality, hand-selected colored gemstones.

In a gemstone with more saturated color, the best cut may be more shallow than average, permitting more light to penetrate the gemstone, while in a less saturated gem, the color may benefit from a deeper cut.

Gemstone Cut

Look at the gemstone in the setting and ensure that all the facets are symmetrical. An asymmetrically-cut crown indicates a gemstone of low-quality. In all cases, a well-cut gemstone is symmetrical and reflects light evenly across the surface, and the polish is smooth, without any nicks or scratches. These are the characteristics that Ratna Jyoti jewelers look for when selecting our gemstone jewelry.

Like diamonds, fine quality color gems usually have a table, crown, girdle, pavilion, and culet. Iridescent opals are one exception, and most often have a rounded cabochon cut.


Nearly all gemstones on the market, including gemstones offered by Ratna Jyoti , have been treated to enhance their appearance. Gemstones that have not been treated but exhibit desirable color and clarity command extravagant prices. Some enhancement treatments are almost universal, are permanent, and require no special care of the gemstone, such as heat treatment to enhance color. Other treatments are common, and may require more or less special care to avoid damage, such as infusion of colorless oil, wax or resin to improve clarity.

Ratna Jyotis Colored Gemstone Enhancement Policy

Ratna Jyoti offers consumers only the highest quality, authentic gemstones. Our colored gemstones undergo rigorous internal inspections by our trained gemologists to ensure they meet our stringent quality standards.

Due to their rarity and unique visual properties, nearly all colored gemstones sold at fine jewelers, including Ratna Jyoti , are enhanced using various techniques. Many of these techniques have been used for centuries. Colored gemstones that have not been enhanced are very rare and command extravagant prices.

Our diamonds are not enhanced in any way, other than normal cutting and polishing.

Colored Gemstone Enhancement Processes

There are many methods of enhancing colored gemstones. We describe the most common enhancements below. For more information on colored gemstone enhancements, see the Gem Trade Associations Gemstone Information Manual.

Heat Treatment

The application of heat to enhance the color and/or clarity of gemstones has been a common practice around the globe for centuries. It is part of the standard polishing and finishing process for many colored gemstones. As such, it is accepted by the jewelry industry and the Gem Trade Association. The enhanced color and/or clarity of heat-treated gemstones is permanent.


The filling of a gem material with an oil, wax, glass, resin or other material, colored or colorless, to improve appearance. This process began centuries ago by gemstone merchants who found that immersing emeralds in oil or waxes made them look clearer to the unaided eye. This practice continues today with many colored gemstones.


The use of wax, resin or oil applied to the exterior of a porous colored gemstone to protect the natural substance, and to improve sturdiness and appearance.


The application of chemicals or other elements to lighten or enhance color consistency.


The act of adding coloring agents so that they permeate a colored gemstone to enhance or alter color.


The alteration of a gemstones color through the use of radiation. This is often followed by a heating process. The enhanced color of irradiated gemstones is permanent.

New and Future Technologies

Techniques for enhancing colored gemstones, either detectable or otherwise, are continually being developed. These may be difficult, or in rare cases, impossible to detect, even for the most sophisticated laboratory. Ratna Jyoti will continue to work with industry groups and gemological experts who are committed to the identification and disclosure of new and future techniques in order to maintain our stringent quality standards.

Basic Gemstone Care

While gemstones are durable, they require varying levels of care. For example, some gemstones are especially vulnerable to household chemicals and temperature changes. Cleaning gemstones presents special challenges. While many gemstones should be cared for by following our basic care guidelines below, please refer to our Gemstone and Pearl Care and Enhancement Overview to understand the care requirements for your specific stone. If you still have questions, please contact Ratna Jyoti customer service.


After removing your gemstone jewelry, clean it by following the directions on a non-abrasive jewelry cleaner. Make sure that the jewelry cleaner specifies that it is safe to use with your gemstone. Use a soft cloth to remove any remaining dirt or other residue.


Store your gemstone jewelry in a lined case or a soft cloth, so the gems do not touch each other or parts of other jewelry. Gemstones are harder than 18Kgold, silver,Coper,or Bronj and can scratch the surfaces of your other fine jewelry if they are not kept separate.


While it is true that gemstones such as old mines burma ruby are second only to diamond on the hardness scale, it is not a measurement of their indestructibility. It means that these gemstones are able to resist scratching almost as well as a diamond. Abrasive surfaces, harsh chemicals, and sharp blows can damage even the hardest gem. Your gemstone jewelry should be the last thing you put on when getting dressed and the first thing you take off at the end of the night. Store your gemstones carefully and they will be enjoyed for generations.