Gemology and Jewelry: Gemology High‑importance

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Diamond enhancement was a good article, but it was removed from the list as it no longer met the good article criteria at the time. There are suggestions below for improving the article. If you can improve it, please do; it may then be renominated.
Review: October 23, 2005. (Reviewed version).

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Moved from Talk:Diamond The article lists that fracture filling of diamonds occurred at the same time as the first laser treatments but in fact laser treatments preceded fracture filling by some twelve years. reference: Crowningshield G&G fall 1970 http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1970.pdf —Preceding unsigned comment added by 81.204.113.195 (talk) 12:55, 3 March 2010 (UTC)[reply]

Clarity enhancement

Treatments (and non-Treatments)

Laser Drilling (not required to disclose before 2001) - and interior acid washing of inclusions, sometimes filled with epoxy which can be damaged by repairing of the mounting when leaving the stone in place.
Fracture Filling - heating, cleaning, resetting, recutting, can break down the treatment, exposing the original flawed stone. Often easy to detect.
Yehuda (Clarity) Treatment - a fracture filling treatment that injects resin. Not readily detectable by most jewelers, and not often disclosed (prior to 2001, it still may not be, depending on the honesty/knowledge of your jeweler).

New FTC regs on treatments and disclosure to buyers

Statements where reasonable people may disagree

A treatment which has broken down is not something for which an insurer is liable.
- This depends on the insurance company, legal jurisdiction, and the fine print of the policy.

Color enhancement / worsening

Coating - cleaning, recutting may damage the coating
Irradiation - Greens may breakdown on heating (cleaning, remounting).
Pegasus color treatment (Monarch) - General Electric inscribes the girdle of their treated stones with GE-POL, but some people have attempted to polish these off. Currently makes colorless diamonds, but they're moving toward fancies. No independent verification on how durable the treatment is.
EGL/NovaDiamond color enhancement - uses pressure and temperature to make fancies. No independent verification on how durable the treatment is.
Beware of shipping items via mail, sometimes (US government, anthrax scare) irradiation is used, which can affect gems - most dramatically, cultured pearls, kunzite, and sapphire. Cumulative effects were also noted, even for the low level of irradiation used.

Dreseden Green Diamond, historical record to 1726, is being used to compare natural versus lab-produced irradiation in hopes of being able to devise a test to differentiat between the two.

statements that should have citations

Color (graded on D-Z, but composed of: Hue (31 gemstone grades), Saturation (9 grades), Tone (9 grades))

~ender 2004-09-04 MST 19:22

Delisted GA

There are no images. slambo 17:20, 23 October 2005 (UTC)[reply]

Melting point of fracture-filling glass

From the section on Fracture Filling: "The filling glass melts at such a low temperature (1673 Kelvin)..." .

1673 Kelvin is 1400 C. Most glasses melt at around 500 C, so something must have gone wrong here. Also, the figure given is implausibly precise for a glass-liquid transition, and degrees K aren't really an appropriate unit. I can't guess what has gone wrong, so I won't try to fix it. Maproom (talk) 12:35, 20 November 2008 (UTC)[reply]

HPHT Dates

HPHT was developed in the 1960's by the Russians and in use by GE starting in the early 1970's. Why does the article say 1999? — Preceding unsigned comment added by 69.143.33.15 (talk) 16:49, 25 March 2012 (UTC)[reply]

1999 refers to specific type of HPHT treatment aiming at controllable change of color, for other dates see HPHT diamond. Materialscientist (talk) 01:05, 26 March 2012 (UTC)[reply]