Showing posts with label pearl bracelet. Show all posts
Showing posts with label pearl bracelet. Show all posts

2008-07-17

Freshwater pearl pendants



I will get into specific cleaning in a moment: First, consider care and cleaning of pearls in general. In a nutshell, cleaning the brooch yourself will come down to baking soda, a good jewelry polishing cloth and a mild detergent. You may opt for a jeweler to do the cleaning. I will get into the specifics later.

"Pearls." Composition of a pearl and why care must be exercised in cleaning and wear. Pearls form naturally in both fresh and saltwater mollusks. The most well-known pearls are saltwater pearls formed inside various forms of pearl oysters. While "oriental" or totally natural pearls were the gems in ages past, pearl farming has led to a supply of cultured pearls which would be impossible from free ranging oysters and the efforts of pearl divers.

Only chance will bring a free swimming oyster to produce a pearl and only fortunate environment will lead to a natural pearl being well-formed, smooth surfaced and beautiful. In pearl farms, many conditions are controlled to help insure a good crop but today pollution in the waters are damaging the growth and supply of fine cultured pearls.

The pearl forms around some type of foreign object inside the oyster shell. In cultured pearls, the object is a bead of mother of pearl (pearl shell) placed into the oyster by pearl farmers. Seeing the object as an irritation, the oyster covers the object with layer and layer of a material called nacre. This is essentially the same material making the shiny and lustrous lining of the shell.

Pearl nacre is made of aragonite, a type of calcium carbonate. A sort of "pearl glue" holds together microscopic plates of aragonite. As long as the oyster is healthy, the nacre forms and becomes thick over the core, developing the luster and shine we recognize as a pearl.
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Why all of that information? There is one reason: aragonite or calcium carbonate. This is the substance of the pearl, the nacre. This material is soft compared to earth formed gemstones. This material is easily damaged by acids, certain chemicals and abrasive substances. The general cleaning methods used for mineral gemstones cannot be safely used to clean the tarnished metal and pearls at the same time. Where a simple gold item may be placed into a mild acid to remove tarnish and buffed to restore shine, that same mild acid will etch the pearl and can actually dissolve it.

"What to avoid when cleaning pearl jewelry?" As important as how to clean the jewelry is knowing what "NOT" to use as a cleanser. Commercial jewelry cleaning liquids are too strong for pearls. Most of these cleaners contain ammonia and ammonia can damage the pearl, reducing the luster. Jewelry cleaners are pretty much ineffective in removing tarnish and are designed to free up and remove dirt and grime more than remove tarnish.

Avoid any cleanser with ammonia, chlorine or abrasives added. Avoid jewelry or silver polishing cloths with a red rouge layer. The rouge is a polishing compound but the red material(iron oxide) can easily get lodged in unseen recesses of a pearl and make the pearl unsightly.

"What to use to clean pearls and remove tarnish from metal?" Oh my, now we get into basic elbow grease! At home cleaning in the safest form is done by taking a wet paste of baking soda and gently rubbing the metal. If the tarnish is not severe, the mild abrasive nature of the damp soda will remove it. Rub with your fingers on the metal only, using a soft brush or implement such as a wet toothpick or cotton ear swab for hard to reach areas. To restore shine to the metal, follow-up with a fine quality jewelry polishing cloth metal.
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