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Diamonds without eye visible inclusions are rare, so the trade long ago found ways to make flawed stones look better than they are. The most common is the laser. Here is exactly how clarity treatment works, what it costs you in durability and value, and why we recommend trading elsewhere on the certificate instead.
The procedure is elegant and a little unsettling. A laser burns a microscopic tunnel from the diamond's surface down to an unsightly dark inclusion; the channel measures just 20 to 25 microns across, thinner than a human hair, far too small to affect the carat weight. With the passage open, the stone is boiled in acid or other chemicals that bleach the inclusion pale, or the laser simply burns the inclusion away.
The result is a diamond that faces up cleaner than nature made it. The original inclusion is still there, merely faded, and the tunnel now runs beside it, but the apparent clarity grade improves. The change is permanent, GIA will grade the stone with the drill channels marked on its plot, and United States Federal Trade Commission rules require the treatment to be disclosed to every consumer. Disclosed, graded, legal: and still, we think, a purchase to decline.
The treatment has a more aggressive cousin. Instead of a tunnel, a variant technique burns a microscopically thin plane through the crystal to reach the inclusion. The plane is larger than a drill channel but looks far more natural, which makes it harder to detect, and it leaves open space inside the stone.
Open space invites the next step: filling. Since the 1980s, surface reaching fractures, natural or laser made, have been filled with a glassy resin that renders them nearly invisible and lifts the apparent clarity grade again. Gemologists and laboratories detect the filler by a telltale flash effect under magnification, and what they find disqualifies the stone: GIA declines to grade fracture filled diamonds at all, because the treatment is not permanent. The filler can degrade and discolor with time, and it can be damaged or destroyed outright during setting, sizing, repair, or routine cleaning.
That impermanence is the heart of the problem. A fracture filled stone must announce itself to every jeweler who ever works on it, must avoid ultrasonic and steam cleaners, and should never be repolished. The treatment does not just change the diamond; it changes how the diamond must be lived with, forever.
| Dimension | Untreated Diamond | Laser Drilled / Filled |
|---|---|---|
| Grading | Fully graded by GIA and IGI | Drilled stones graded with channels plotted; fracture filled stones refused by GIA |
| Durability | The hardest material worn by humans | Channels weaken the crystal and trap dirt; filler fails under heat, ultrasonics, and bench work |
| Disclosure | Nothing to disclose | Legally required at sale; practically required at every repair, resize, and cleaning, for life |
| Market value | Priced on rarity and quality | Priced well below equivalent untreated stones; many buyers decline treated goods entirely |
Read the table as a whole and the trade reveals itself: the treatment buys one apparent clarity grade and pays for it with durability, liquidity, and a lifetime of asterisks. There are cheaper ways to save money on a diamond, and better ones.
We do not recommend laser drilled or fracture filled diamonds, and the reasoning fits in three cards.
The entire benefit is a stone that appears one clarity grade better. The entire cost is permanent stigma, reduced durability, and a resale market that does not want treated goods. That exchange loses on every line.
Every jeweler who cleans, sizes, or repairs the ring must be warned, for as long as the ring exists. Your heirs inherit the same duty. A diamond should be an heirloom, not a maintenance protocol.
The same savings live one column over on the certificate. Step down a color grade the eye cannot detect, or a few points of weight the finger cannot feel, and buy a natural, untreated, eye clean stone with no asterisks at all.
ROSI™, our gemological intelligence, built by our gemologists, does not recommend treated diamonds, and every stone it scores is screened for treatment before anything else. Request a ROSI™ Score Report on any diamond you are considering, ours or anyone else's, and know exactly what you are holding.
A treated diamond is a bargain struck against the truth. The savings are real, and so is everything you signed up for to get them.
There is nothing illegal about a disclosed, laser drilled diamond, and for some buyers the price is persuasive. But a diamond is supposed to be the one purchase that asks nothing of you afterward: no warnings to jewelers, no cleaning restrictions, no explanation at resale. Spend the same money on an untreated stone with an honest certificate, give up a grade the eye cannot see, and own something that never needs a footnote.
Found a diamond you are considering, here or anywhere else? Send the GIA or IGI certificate number and our gemological team returns its ROSI™ Score and a read of where it sits in the current market. Complimentary, within minutes.
Score a DiamondWhere stones of the same exact specifications are trading on the open market right now. You get a straight answer, even when the diamond is not ours.
John Anderson, our Lead Gemologist, screens diamonds for laser drilling and fracture filling every day, and can read the signs on a certificate or under magnification in minutes. Send him whatever you have, paper, photos, or a listing, and he will give you a straight answer. The consultation is complimentary and there is no obligation.
1-800-779-1726