Schlagwort-Archive: Opal

Opals dulled by waer

Opals dulled by waer

Wear can reduce the brightness of an opal. The surface of the opal becomes covered with small scratches and pits caused by coming in contact with harder objects. In addition, detergent tends to dry the surface and make it opaque. Scratches and detergent reduce the amount of light which can enter and return from the opal, reducing the brightness of the opal. This is most common in rings. A properly set opal can reduce scratching by making it more difficult fot objects to come in contact with the opal. Removing rings before washing your hands helps reduce exposure to detergents.
If an opal become scratched and opaque, it can be usefully saved. Using fine sand paper, with the opal still set, sand the surface of the opal. Do not sand the prongs of the setting . Then re- polish the opal with a wet mixture of tin oxide or cerium oxide on a flexible leather disc or a muslin buff, making sure the stone does not get hot. You may not be able to remove the deep scratches, but you will be surprised how much better the opal looks. Be careful that the setting does not grab the polishing disc and go flying.
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Using the process I have re-polished many rings and never cracked one. Thiss progress will flatten the top of the stone slightly and will not remove scratches on the sides. In order to do a complete job it is necessary to remove the stone from the mounting, something I suggest you avoid if at all possible, because there is always a chance that the opal will break as you lift a prong.
Opal is not as fragile as is commonly thought. Remember my dopping technique. A well*protected opal will last a lifetime. The secret is the setting.

The care of Opal

The care of Opal

There are more missinformation on the care of opal rough and finished stones than in any other part of the opal hobby. Opal is about 6% water. The fear most people have is that it will dry out and crack. In fact under normal usage Australien opal will not crack. Rough opal need not be kept under water until cut. Dealers keep it in water because it gives illusion polish, not because it will crack if it drys. Even the highest quality gems rough is shipped from Australia dry. Finished opals need not to be oiled or soaked in water periodically – although soaking them in water will do not harm. Some people believe that oil protects the color. Actually oil hides the cracks in a stone and can discolor or dull the stone over time. The best care is to wear and love them.
 
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The stories i have heard about cracking fall into three groups. One is the common one of hitting the opal and having a crack. I expect that many circumstances where an opal just cracked are cases where people hit the stone but were unaware of it. – remember the tile nippers! Set properly, this problem can be virtually eliminated.
The second is the situation where an opal has been left in a jewelry

care of opal
Opals

box for several years and is cracked when it is taken out. Again, it may be that the opal was hit by other jewelry over the years. But it may be not the cause. Here, again my recommendation that you wear and love your opal. The moisture the stone get when it is worn may prevent any problems. Alternativly, you could soak it in water periodically . It will not hurt and might help. (Do not , however, soak it if the opal is a doublet or triplet).

The third source of cracked opals is the bank safe deposit box. For some inexplicable reason, safe deposit boxes are death on opals. It may be the atmosphere or a change in pressure or those sonic motion detectors. I don´t know. But i have seen more cracked and ruined opals coming out of the safe deposit boxes than from any other source except abuse (hitting). Avoid them if it all possible . If you do keep unset opals in a safe deposit box, put them in water. Set opals can be placed in plastic bags with a little moisture to help prevent damage.
There is another source of cracking which you should be aware of. Jewelry store windows and display cases use very strong lights which get very hot. So do the opals in display. After a long period of displaying, the opal may crack. I have seen numerous cracked opals in jewelry store displays.
By Paul B. Downing, Ph.D. -“ Opal cutting made easy“

 

Kettenanhänger aus Gold mit Opal

Kettenanhänger aus Gold mit Opal

Bei diesem Kettenanhänger aus Gold mit Opal handelt es sich um eine Auftragsarbeit.  Ich habe diesen Anhänger vor längerer Zeit in meiner Goldschmiede angefertigt. Glücklicherweise habe ich das Photo von meinem alten Computer retten können.

Den großen Opal hatte der Kunde aus einem Urlaub mitgebracht.

Kettenanhänger aus Gold mit Opal
Kettenanhänger aus Gold mit Opal

Nach einem ersten kurzen Gespräch, aus dem hervorging, dass der Edelstein für einen Anhänger in Gold (Gold vom Kunden) verarbeitet werden soll, habe ich mich ein paar Tage mit diesem Stein beschäftigt und einige Skizzen auf Papier gebracht.

 

Skizzen helfen bei der Umsetzung

Aus diesen Skizzen entwickelte ich in einem weiteren Gespräch den endgültige Entwurf. Ich  habe diesen dann nochmals mit Aquarellfarben auf Papier gebracht. Anhand dieses Entwurfs, den der Kunde vorab nochmals in meiner Goldschmiede zu sehen bekam, habe ich schließlich mit meiner Arbeit am Werktisch begonnen.

Der Opal, der etwa eine Größe von 25 * 17 mm hat, habe ich in ein leicht gewelltes Goldblech eingearbeitet. Das Goldblech hat eine grob strukturierte Oberfläche erhalten. Die Politur der Fassung wird wieder in dem Runddraht, der das Goldblech umrandet, aufgenommen. Dieser äußere Golddraht schließt den Anhänger nicht nur optisch nach außen ab. Er sorgt auch für mehr Stabilität und für mehr Komfort beim Tragen des Anhängers, da es somit keine scharfen Kanten mehr gab.
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