Recutting Diamonds and Colored Gemstones


Step 4: Gem Grading

Lesson 5

A Note on Antique Gemstone Cuts

To determine if recutting is worthwhile, you’ll also need to know how to value old style cuts. Old mine and European cuts are no longer used. You won’t find them in pricing guides. For appraisal purposes, calculate their value after recutting. In contrast, the rose cut is an antique style that’s enjoying a resurgence of popularity.

What Makes Recutting Diamonds and Other Gems Worthwhile?

Generally, four situations make recutting diamonds or colored gemstones worthwhile:

  • Repairing damage.
  • Increasing the clarity grade by removing inclusions.
  • Re-proportioning to improve optical performance.
  • Buying and repairing damaged diamonds.

This article focuses primarily on recutting diamonds, since you’ll work with these gems most often. The final section deals with the differences between recutting colored stones and diamonds.

A 4.82-ct tanzanite, recut into a unique 3.90-ct custom cushion that fit the shape of the existing stone. © CustomMade. Used with permission.

Recutting Diamonds to Repair Damage

You’ll see diamonds with all levels of damage. With a simple re-polishing, you can correct minor blemishes and finish faults. While you can repair some damaged stones simply by cutting a new …

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Full Article Details


Content Length 3099 words
Reading time 15 min 30 sec

Here's what you get if you unlock this article:

  • A Note on Antique Gemstone Cuts
  • What Makes Recutting Diamonds and Other Gems Worthwhile?
  • Recutting Diamonds to Repair Damage
    • Repairing Round Brilliant Diamonds
      • Common Problems
      • Severe Damage
    • Repairing Fancy-Cut Diamonds
  • Recutting Diamonds to Improve the Clarity Grade
  • Recutting Diamonds to Re-proportion for Optical Performance
    • Re-proportioning Round Brilliants
      • Shallow Crown and Shallow Pavilion
      • Shallow Crown and Deep Pavilion
      • High Crown and Shallow Pavilion
      • High Crown and Deep Pavilion
    • Re-proportioning Fancy-Shaped Stones
  • Recutting Diamonds for Additional Income
  • The Diamond Cutter as a Resource
  • Recutting Colored Gemstones
    • Jam Peg and Calibrated Faceting Machines
    • Time-Consuming Factors
    • Repairing a Gem Cut on a Calibrated Machine
    • Repairing a Gem Cut on a Jam Peg
  • Recutting Native Cut Gems

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  • Exclusive access to other premium articles and courses
  • Unlimited access to our gem pricing guide
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