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Problems associated with the identification of B-jade and FTIR Spectroscopy

Problems associated with the identification of B-jade and FTIR Spectroscopy

Problem associated with the identification of B-jade

Gemmological methods:

Index of Refraction:

No difference between natural and treated jadeite

Absorption Spectrum:

No difference between natural and treated jadeite

Appearance:

Immersing the treated jadeite in acetone for 30 minutes shows no visible change in appearance. No effect is observed after immersion in alcohol for five minutes. Alan Hodgkinson used a small drop of pure HCl on a piece of natural jadeite, he observed sweating effect.

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GE Synthetic Jadeite

The latest synthetic jadeite from American General Electric Corporation shows characteristic abosrption bands of 3373, 3 471 and 3614 cm-1 under the infrared spectrocopy, which is resulted from the hydroxyl stretching vibration in GE synthetic jadeite jade. it also shows a series of spectral peaks of 376, 700, 989, 1938 cm in a laser Raman spectroscopy.

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Objects Made from Jadeite

12. Objects Made from Jadeite

Jadeite is faceted or carved for jewelry, religious, or ornamental use. As jewelry it is cut into cabochons, beads, and earrings, carved to make intaglios, and carved into rings and bracelets. It is also carved into a wide variety shapes as ceremonial or ornamental sculptures and figures. The overall quality of the stone is sometimes taken into account when deciding how to fashion rough jadeite.

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Fused-powder Jadeite

A new treated jadeite appeared in the market in recent years, believed to have been originated from China, is a composite material made with powdered jadeite and glass compound. The surface of this composite jadeite shows a mosaic pattern of green (jadeite) and colourless (glass) fragments under magnification, gas bubbles may also be found.

Most important value factor: Colour in Jadeite-Jade

Colour (,se)

This is the most important factor in the quality of fashioned jadeite. As per standard colour nomenclature, jadeite's colors are best described by breaking them down into the three colour components: hue (position on the color wheel), saturation (intensity), and tone (lightness or darkness). Colour distribution must also be taken into account. The necklace in figure 23 is an excellent example of top-quality hue, saturation, tone, and colour distribution.

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Who are we?

The Geohavens name is an assurance of timeless beauty, distinct quality and uncompromising value. The Company spares no effort in sourcing from the farthest markets and the deepest mines in order to unearth the most attractive gems.

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