Can anyone tell me what the “color master code” used by the
Gemological Laboratories in Los Angeles in 1981 was? I know little
about gems and need some help on this.
A customer wants a replacement for a large citrine and she gave me a
description and appraisal of the original that contains a description
of the color in terms of the “color master code”. I have seen the
original (which has been stolen), and my memory is that it was a pale
yellow, but when one looks into it, it viewing it through the thickest
part, is indeed a very attractive honey color, and the facets around
the side reflect ambient light quite beautifully.
I have never seen a citrine with the same color characteristics. All
the large ones I have seen are significantly darker, and I have
assumed this is due to the fact that they are produced by heat
treating. The customer does not like the large dark colored citrines
she has seen, and wants to get a new one of the same color as the old
one. The appraisal has the following description, including a
description of the color in terms of a "color master code:
Shape: Mixed oval Step Cut Length: 26.05 mm Width: 20.53 mm Depth: 12.9 mm Weight: 46.38 Cts. Florescence (1w) inert " (sw) inert
Cut: Fair, large window in center of stone. Polish: Poor, abraded
crown and pavilian facet junctions, polishing marks, surface scratches
Phenomena: None Inclusions: no visible inclusions under 10X magnification Color master code: OB, 33, 77, 04 Color: Medium light yellow Clarity: Internally Flawless Comments: None Conclusion: Natural Citrine Quartz.