Diamond: Quality, Grading, Value and Certification

Hope diamond

Hope diamond mounted on platinum. Discovered: before 1668; The gem was cut several times between 1668 and 1958
Hope diamond mounted on platinum. Discovered: before 1668; The gem was cut several times between 1668 and 1958 | Source

Know diamond grading before buying

Some laboratories provide certifications for quality and grading of diamonds that determine the value of a diamond. The number of new consumers is growing very fast all over the world. Non-trustworthy sellers may take a chance and cheat these new customers. This article is written with a purpose to educate them to get the full value for their money.

India was producing much but consuming less in recent past but Indians are now consuming a huge quantity of diamonds. How to evaluate and buy the diamonds and diamond jewelry?

It is better to go to a trustworthy Jewelers. It is also advisable to know about the grading of diamonds to determine its value before buying a diamond or a diamond jewelry. People prefer investing in diamonds. It is extremely necessary to know the realistic value along with quality and grading of the purchased diamonds or diamond jewelry.

A Diamond is forever - De Beers

Diamond cut history

A diagram of old diamond cuts showing the evolution from the most primitive (point cut) to the most advanced pre-Tolkowsky cut (old European)
A diagram of old diamond cuts showing the evolution from the most primitive (point cut) to the most advanced pre-Tolkowsky cut (old European) | Source

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Value of diamond is dependent on four C's

Certification bodies use four "c"s as a parameter for grading quality of the diamond. These four are also a parameter in determining the value of a diamond and diamond jewelry.

1. cut

2. color

3. clarity and

4. carat weight.

Cut: There are different types of cut e.g. Flat cut (parav and polki, rose cut) Michael cut, single cut, brilliant or double cut etc.There are also different shapes such as round, square, octagon, oval, marquise and various fancy shapes such as pentagon, alphabets, star etc. Beads, drops, briolettes are also available in diamond.

Diamond cuts are certified as excellent (the best), very good, good and fair (cut quality in descending order).

Color: Diamonds are found mainly in colors ranging from white and brown or yellow. Some fancy colors such as green, blue, pink, red are found rarely in nature. These natural fancy colors fetch enormous price depending upon its quality.

Fancy colors are also obtained by treating diamonds. These artificially colored diamonds are not expensive.

As per international standard of diamond grading, it is graded in 'D' to 'P' colors. The best white color is graded as D and then E, F, G, H etc in descending order. Color grade from D to H is considered as white. Grade I, J, K, and L represent shades light to medium brown or yellow. M, N, O, P grades represent deep brown or yellow color. Grades from 'P' to 'Z' is for fancy yellow, golden, orange or brown. It is difficult for laymen to determine minute differences in shades. Only experts can determine those variations in color.

3. Clarity: Diamonds are graded for clarity as IF (internally flawless), V VS-1, V VS-2 (very very small inclusions), VS-1 VS-2 (very small inclusions) and SI-1, SI-2, and SI-3.The purest is IF and the least purity has a gradation of SI-3.

Fluorescence is one of the inclusions of diamond which lessens brightness or glitter of a diamond. Diamond grading certificates mention this inclusion separately as fluorescent or non-fluorescent. Fluorescent diamond has a lesser value.

4.Carat weight: Diamonds are found in various sizes. it is weighed in carats. One carat is equal to 200 mg. Further, a carat is divided into 100 parts and this part is called cent. One carat is equal to 100 cents. In general more the weight more the price, a lesser weight fetches a lesser price.

Comparisons of Diamond clarity grades

Guide to Diamond color

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Certifying laboratories

There are synthetic and treated diamonds. Synthetic diamonds have very low value.Treated diamonds also have a lesser value.

More and more people buying diamonds are dependent on certificates. However, they generally do not know about the standards that determine the value of diamonds. The most painful are unethical practices of many certifying agencies.There is no system of authentication of certifying agencies. Many laboratories grade diamonds in genuinely. Some traders use these in-genuine certificates to cheat their customers.

Just one grade up in color enhances value by ten to fifteen percent on an average. Similar things happen with clarity. If a certifying laboratory grades an H color diamond wrongly to G and VS2 purity to VS1, it will enhance price by 25 to 30 percent or so.

GIA certification is much better than others according to the Jewelers, I talked about.To the best of my knowledge, they strictly adhere to the standard. A good news is that Bureau of Indian Standards (BIS) Is now coming to grade diamonds.

Now onward, whenever to go to buy a diamond refer to above-mentioned features to get the full value of your money.

( This article is written for laymen / general customers. This is an attempt to make aware the consumers. It is not meant for technical purposes. Please consult your adviser or a trustworthy jeweler before buying diamonds.Please feel free to mail me at vardhamangems@yahoo.com for any relevant information).

Learn 4Cs of Diamond grading by GIA

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Comments 30 comments

JYOTI KOTHARI profile image

JYOTI KOTHARI 23 months ago from Jaipur Author

Thanks Cornelia for commenting.

CorneliaMladenova profile image

CorneliaMladenova 23 months ago from Cork, Ireland

Great article, I learned so much about these precious stones :)

Sam 5 years ago

Very useful information presented in a great way! Very useful for people who are interested in diamonds and are considering investing in them.


JYOTI KOTHARI profile image

JYOTI KOTHARI 6 years ago from Jaipur Author

Dr. Hasan,

Thanks a lot.

Jyoti Kothari

DR. Hasan 6 years ago


JYOTI KOTHARI profile image

JYOTI KOTHARI 6 years ago from Jaipur Author


Nice comment. Thanks,

Jyoti Kothari

Reneepp 6 years ago

Diamonds have huge investment value and they should be bought with lot of care and concern.

4 C's

Diamond grading certificates are the few basics of diamond perches.

Your information is really valuable. Thanks for sharing!!!


JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Hi Dr. Kabir,

Lot of thanks for your long edition in this hub.

Thanks again,

Jyoti Kothari

DR. HASAN KABIR 7 years ago


The lure of diamonds is intensified by lyrical ballads, enlivened by timeless tunes, immortalized by legends and love, in the near future expressed by the magical creation from RAJESHSHORI JYOTISALAYA.

A gift of eternity

Diamond is one of the rear charms whose intensity remains unchanged for so many thousand years. Some thought of it as fragment of star, some thought of it as God's teardrop, some thought Cupid's arrow was tipped with diamonds that gave it extra ordinary Qualities. The Greeks believed the five in the diamond reflected their constant flame of love. Today the image of diamond has drawn from theses various routes to enjoy the unique status of being the ultimate symbol of love and eternity.

From Kings and Queens:

Diamonds have been sought the world over, fought for worshipped and used as expression of love, royalty, spirit, invincibility, and magical power. They have travelled from crowns of kings and queens to hands of conquerors to showcases in museums. This regal saga of the ‘Queen of Gems’ is best captured in the artistry of the “King of Jewellery” –Rajeshshori Jyotisalaya. It boasts of a diamond range put together with rear talent, meticulous effort and matchless skill. A special design and development cell creates each piece of jewellery after studying international trends. Exquisite diamond pieces creativity amalgamates oriental and occidental designs. The diamond ring collection epitomises Rajeshshori Jyotisalaya passion to innovate, as well as the passion diamond-evokes in every person heart (not at present, I am trying to get permission from the Govt. of Bangladesh). The finest talent creates this expression of love while being in right to the sense of style and romance a modern woman seeks. In the jewellery sets there are also combination diamond pieces, with touches of pearls, rubies, sapphires, emeralds and other such precious stones. This style is as traditional as it is trendy. The early royals often bedecked themselves with such combination jewellery and so do the modern day fashion icons.

For Marilyn Monroe and you:

Today images of dazzling divas conjure up in one’s mind, at the very mention of diamond. This crystalline stone has found its pride of place in the highest echelons of society at all ages. Liz Taylor, Marilyn Monroe, Princes Dina, are some of the prima donnas who symbolise the magnetic appeal of diamonds But no matter how elusive the stone is, it is always within your reach, with Rajeshshori Jyotisalaya. The Rajeshshori Jyotisalaya range of diamonds jewellery offers surprising value. There are nose pins starting from 150US$, pendants spriced at 900US$ and above. Cluster tops one of the hottest selling items in today’s jewellery market all over the world are priced 850US$, onwards. Studs, broaches have price tags of 700US$, onwards and bracelets starts from 650US$. Solitaire rings are 700US$ onwards, Solitaire tops starts from 900 US$, while neck pieces are from 570US$, small diamond necklace sets begin at 2000US$, combination sets of rubies, emeralds, pearls, diamonds rate prices at 3500US$ onwards. Diamonds bangles, single line (2 pieces) cost 5000US$ onwards. There are solitaire diamonds top starting from 500US$ and bangles from 3500 US$, within a highly appreciated resale value and a lifetime warranty. Rajeshshori Jyotisalaya’s diamonds that will come with a certificate of authenticity are an amazing buy, a precious gift, an enduring possessions and a profitable investment.

Note: Above item priced are not included Government tax. The buyers should be paying the Govt. Tax throughout me. You will get Govt. tax necessary paper and documents. Please don’t request me something to do which illicit and illegal. If you request this kind Rajjatak Dr. Hasan Kabir might have right to refuse any one else.

Care for your diamonds:

Prepare a small bowl of hot water with any mild liquid detergent. Clean diamond studded jewellery with a new soft toothbrush. Transfer to a wire strainer and rinse with warm water. Put a dry with soft clothes. Please do not keep diamonds jewellery together as diamonds scratch each other. Do not wear your diamonds while doing rough work like washing dishes. Bring your diamonds to me for a free check up once a year.

How to choose a right diamonds:

• Check for the 4 c’s cut, carat, colour and clarity. cut: it takes a master cutter to revel the brilliance of diamond. Hold of the diamonds to the light and see if it through out a rainbow of colours.

• Carat: This is a measure of weight not size. A small stone may have a higher carat than a bigger looking one.

• Colour: Diamonds may appear colourless but there are actually 20 subtle grades of colour from exceptional white to Tinted colour. The fewer colours a diamond has, the more valuable it is.

• Clarity: The size, location and number of naturally occurring minerals or “inclusions” in the stone provide uniqueness to each diamond and affect its value.

A Sparkle on your neck is worth a thousands Sparkles in your eyes!!

Where diamonds found:

Once a time Indian GOLAKUNDA Diamond mines was world famous. Now a days where is Golakunda mine, No one can say? The world famous diamond like KOHINOOR, the great Mogul, Regent (pitt), Dresden, Shah Of Persia, Moon of mountain, Nizam Diamond, the Jahangir, Daria-e-noor are Golakundo mines diamond. Brazil, South Africa, Angola, Zaire, Ghana, Guinea, Ivory coast, Tanzania, Soviet Union, Guyana, Venezuela, Borneo, Australia.

• Chemical composition: Carbon

• Hardness: 10

• Hardness: 10

• Specific gravity: 3.47-3.55

• Refractive index: 2.417-2.419

• Dispersion: 0.044

Planet Venus fact file:

• Relation to the sun: 2nd planet from sun

• Mean distance: 108 million km (67 million miles).

• Relative size: very similar to earth.

• Atmospheric composition: 96% Carbon dioxide, 3% Nitrozen, traces argon, water.

• Orbit around the Sun: 224.7 earth years.

• Period of rotation: 243 earth days.

• Surface temperature: -480°c (-896°F)

• No. of moons: 0 moon

• Vibration of the planet Mercury: 130000Hz.

(Vibration varies person to person)

• Radiation of the diamond: Frequency range 60,000 to 65,000Hz.

(Frequency range varies on gems Quality.)

Emma 7 years ago

Hi Jyoti,

I was just surfering internet and found your article.

I left India 1,5 months ago after making good " business" with one of Jaipur stones factory.

I was naïve and now the point is not about my lost money but about some rules.

If you have some advise please contact me: zima2@tlen.pl

kalpesh 7 years ago

i am fancy color diamond seller round&sheapcut mob:919327013180 kalpesh

JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Hi Emma,

I feel unpleasant that some one have cheated you. You have not left any contact so that I can try to suggest you something. If you will come back to this hub and see this comment then info your contact.


Jyoti Kothari

Emma 7 years ago

Thank you for great article.But it' too late.

I'm just new cheated customer by Jaipur stones factory.

Some advise now?

JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Hi Kalpesh,

Thanks for your comment. I have noted your Mobile Number.

Jyoti Kothari

kalpesh 7 years ago

i am fancy color diamond seller sheap &roundcut mob:919327013180

JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Dear Vinod,

Thanks for your comments in the hub Diamond: Quality, Grading, Value and Certification. I am glad to know that this hub has helped a person like you who is in gems and jewelry trade.

Jyoti Kothari

Vinod Malpani 7 years ago

We are from jaipur and dealing in semi precious stones. Some times we use diamonds and this hub will help us in evaluating diamonds. Our knowledge of diamond is limited.


JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Dear Earnesthub,

Thanks for comments. I am in Gems and Jewelry business so there is nothing special in having knowledge about my business. i am glad to know about your love to diamonds.

Thanks again.

Jyoti Kothari

earnestshub profile image

earnestshub 7 years ago from Melbourne Australia

Another really helpful hub Jyoti, I love diamonds and this is the first time I have seen this information. You certainly have a lot of knowledge. Much appreciated!

JYOTI KOTHARI profile image

JYOTI KOTHARI 7 years ago from Jaipur Author

Hi Monalisa,

These are essential tips for buying diamonds. GIA is the most trusted source for certification of diamonds to the best of our knowledge.

Jyoti Kothari

Monalisa 7 years ago


You have described basics of diamonds very well. What if we do not get GIA certificates?


JYOTI KOTHARI profile image

JYOTI KOTHARI 8 years ago from Jaipur Author

Dear gemfind,

You can join http://vardhamangems.webs.com for more info. It has forum and blog about gem and jewelry.

Jyoti Kothari

gemfind profile image

gemfind 8 years ago

Useful information on diamonds.

R.S. Reddy 8 years ago

Should I buy some diamonds for investment? Will value increase? Where from should I buy it in Hyderabad?

BrainFire profile image

BrainFire 8 years ago from The Island

Thanks for publishing this!

Excellent reference hub Jyoti!

My Mom has been a Jeweler for over 30 years now. Her site is: http://www.WeBuyItAll.com/

My Mom, and the rest of us are really into Antiques, and Antique Jewelry too. I wear a pink gold ring with rubies, and diamonds that's over 100 years old. She's also made me countless pieces of custom jewelry over the years, which I've always loved too.

I love all jewelry, and yours is amazing.

Thanks for all the info! Happy hubbing!


Lou Purplefairy profile image

Lou Purplefairy 8 years ago from Southwest UK

hi jyoti,

Great Hub!

a quick question.

I live in the UK.

Which body would I contact about having a diamond in an antique setting graded? A friend has an old ring which the local jeweller has estimated to be a 0.4ct old mine cut stone.

Thanks for the welcome

Lou Purplefairy

JYOTI KOTHARI profile image

JYOTI KOTHARI 8 years ago from Jaipur Author

That is why I write it. Consumers should aware before buying.

Jyoti Kothari


john schmit 8 years ago

Fantastic. it will help me buying diamonds.Info regarding decieving attitude of salers and certifying agencies are fascinating. thumbs up.


JYOTI KOTHARI profile image

JYOTI KOTHARI 8 years ago from Jaipur Author

Dear Ratnaveera,

Your name contents word 'ratna' means gemstones, as you know. I think, you like the gemstones, diamond is one of them.

jyoti Kothari,


ratnaveera profile image

ratnaveera 8 years ago from Cumbum

Dear Jyoti, Thank you for presenting very nice and informative Hub. This will be very useful for diamond lovers.

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