Diamond Polish

Bottom Line Recommendation:

  • Polish: Do NOT spend any extra money to upgrade polish to anything higher than “Good.”  It’s a complete waste of money.
  • Never, ever, ever pay more for “Triple Excellent” Diamonds!

What is Polish?

Diamond Polish refers to how smooth the outside surface of a diamond has been polished.  You can achieve higher grades by using a finer grain diamond dust on the polishing wheel and polishing for a longer time.

Does Polish Matter?

I have worked in the industry for over 6 years, working for one of the largest and most well respected firms with offices in over 10 cities all over the world, and I cannot distinguish between an “Excellent” Polish diamond, a “Very Good” Polish diamond,  or even a “Good” Polish diamond.  Technically speaking, “Excellent” Polish diamonds have been polished longer on the polishing wheel with a finer grain of diamond dust, but the simple fact is, if I can’t tell the difference with a 10x loupe, there is absolutely no way you will ever be able to perceive a difference without it.

So while it might look nice on a piece of paper to have a pretty word like “Excellent” written three times, it’s certainly not worth the extra 10-20% you’re going to pay for it.  It would be like a car salesmen convincing you to purchase a $5000 upgrade package for a “friendlier cabin aura.”

If you have any questions, please post them in the comments below.  I will usually respond within 24 hours.

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  1. M     Reply

    Hi Ira, I hope you can help me. I’m going to purchase an enhanced diamond one of two, either a 2.00 ct G SI1 or a 2.49 ct G SI2 stone. The price for the enhanced stones are in line with other stones I’ve seen. In fact the price is really good. The dealer is a well regarded vendor on Ebay since 2008. He has answered all of my questions, but there seems to be a bit of a language difference and we aren’t understanding each other as well as I would like for this kind of a purchase. He is in Isreal, and the name of the vendor I Diamonds. Very, very, nice man.

    The dealer told me that he would purchase the 2.49 ct stone and have it polished down to a 2.00 ct to “What we do is basically polish the 2.50 carats to 2.00 carats and brilliance, sparkle
    and the clarity is becoming much more beautiful and quality SI1.”

    Wouldn’t it be better to just buy the 2.00 ct SI1 stone?

    Thank you for your time.


    • Mike     Reply

      Yes it would be better. He doesn’t want to do that before selling it because there is a risk in doing re-cuts. If you buy it, you assume the risk.

  2. Molly     Reply

    I’m planning to go with this diamond: good call?


    I don’t want to go too low in color, because I like a very bright white diamond. But I also want to get a great value and size.

    • Mike     Reply

      That is a very nice diamond.

  3. Pingback: Choosing the Perfect Diamond

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