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Diamond Fluorescence & What It Means

Posted on June 10th, 2019 by JoeG

Most people shopping for diamonds have heard of the 4 C’s to consider when looking to buy a diamond.

  1.  Color
  2. Clarity
  3. Cut
  4. Carat Weight

These are the characteristics shoppers and dealers look for when purchasing a diamond. Diamonds that have been certified and graded by G.I.A. will have this information on the certificate, but there is another characteristic that 25 to 35% of all natural diamonds exhibit and has become more crucial in determining the values especially over the last 15 years or so. Fluorescence is something that isn’t always apparent to the unaided eye, but can instantly be seen under a Blacklight source. While it is not a grade, it is an identifying marker/factor that will range from:

  • None
  • Faint
  • Medium
  • Strong
  • Very Strong

See the G.I.A. picture for some examples of varying degrees of fluorescence in the same diamonds in daylight and under UV Black Light.

Diamond Buyers Chicago

Some dealers will instantly discount a diamond with fluorescence, while others believe and recognize that fluorescence in lower grade color diamonds from I to M can actually enhance the diamond to appear as if it is a whiter higher grade color. The opposite is true when higher grade color diamonds such as D to H with Blue fluorescence will cause a diamond to look hazy, cloudy and oily especially if it is strong blue in intensity. These diamonds will usually be discounted even if the color and clarity are high.

Like art, beauty is in the eye of the beholder and the effect of fluorescence will vary from diamond to diamond. But it is a factor to consider when buying or selling a diamond. We buy & sell G.I.A. graded diamonds.


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"I drove all the way from the south side just to sell my silver to Chicago Gold Gallery because of the knowledge and professionalism I received on the phone. They gave me top dollar for my silver and were so fast and friendly. I definitely recommend this business!"

Date: 10/27/2017 • 5 / 5 stars ★★★★★

Can't say enough about this place.

This is the most welcoming, non-pretentious place to do business! I was researching where to sell sterling silver I had and ended up choosing here based on the other great reviews. They walked me through the whole process and answered my questions. I got a great price for my items & will go there again.

Date: 09/17/2018 • 5 / 5 stars ★★★★★

Love this place!

Chrissy & Joe are all super friendly and easy to work with. I trust them and they will do whatever they can to help you including giving you advice on what you have or what you should look for. I won't ever go anywhere else and I've recommended it to several friends.

Date: 08/02/2015 • 5 / 5 stars ★★★★★

I would do business with them again

I had a large collection of silver coins sitting in my safe deposit box for 15+ years. Chrissy was so friendly and helpful she even gave me advice about coins I didn't know. She was more than happy to help me for over an hour in between taking care of other customers. They really did give me top dollar for my coins. Whether you are new or a pro with coins, I can highly recommend you take them here!

Date: 02/22/2020 • 5 / 5 stars ★★★★★

Don't Hesitate to call...

I find that Joe at Chicago Gold Gallery consistently offers and pays more for my coins than coin dealers in Chicagoland. He's very nice and easy to deal with. Don't hesitate to call him and preferably visit him.

Date: 12/04/2015 • 5 / 5 stars ★★★★★

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