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October 30, 2009

Tips on wearing opal jewelry

Filed under: Uncategorized — admin @ 3:52 pm

Opal is a relatively soft stone, and soft stones don’t do so well in certai types of jewelry. For example, opal pendants can make lovely jewelry, and are relatively safe since they hang around one’s neck.

However, one should use care when purchasing an opal ring, because rings can so easily hit against the side of a wall, or a door, or be scratched on a table or desk…and opals can be scratched when hit in this fashion.

So just be aware that if you’re going to wear an opal ring or bracelet, it should be for a single function – such as a party – and as soon as you get home, take it off and put it back in your jewelry box to keep it safe.

October 28, 2009

The National Gem Collection (US)

Filed under: Museums, opal jewelry — Tags: , — admin @ 1:54 pm

The Smithsonian Institute was founded in 1855, after a bequest by a British scientist, Charles Smithson, upon his death in 1835. (How the Institute came into being is a fascinating story in itself.)

Today. the Institute has 19 museums, most of  them located in Washington DC. The Air and Space Musuem is perhaps the most famous, but its the National Gem Collection that interests here.

Several pieces of opal jewelry are on display in the collection (and photographs of them appear in the book The National Gem Collection, published by the Smithsonian Institution.

The two most famous pieces are an opal and gold necklace designed by Louis Comfort Tiffany in about 1915-1925. It is accented with brilliant green demantoid garnets from Russia. The black opals are from Lightning Ridge, Australia. Ruth and Townsend treadway gifted it ti the Smithsonian in 1974.

There’s also a peacock brooch designed by Harry Winston, Inc. It features a 32-carat black opal from Lightning Ridge as the peacock’s body, with a head and dangling tail encrusted with smaller sapphires, rubies, emeralds and diamonds. Harry Winston gifted it in 1977.

October 26, 2009

Straight, by Dick Francis

There’s a wide variety of literature on gemstones, including opals. Most of it is non-fiction, of course, and talks about how gemstones are found, how they are cut, the history of the most famous gemstones in the world, and so on.

But gemstones are written about in fiction as well, usually in mystery stories where some famous jewel has been stolen, its owner murdered, and the detective has to find the one and discover the other.

Depending on how well written these types of fictions are, the reader may be interested in gemstones in spite of themselves, and become a collector or at least a devote.

(In my own case, I first became interested in gemstones decades ago, when I discovered the book Modesty Blaise, by Peter O’Donnell. A “female James Bond,” we first see her carving a gemstone, as she has lapidary as a hobby. O’Donnell described the process so well that I thought I might like to do it myself. Of course after a few lessons I realized that I had no artistic talent whatsoever. I must remain a devotee and an appreciator of the works of others, unfortunately.)

Anyway, another book that launches the layperson’s interest in gemstones is Straight, by Dick Francis.  Dick Francis is the former steeplechase jockey who, after his retirement, went into an incredibly successful career as a mystery author, typically with the horse racing scene as a background.

In Straight, the protagonist is a jockey, whose brother has been killed in an accident. His brother owns a gemstone firm, which the protagonist inherits. While the hero, Derek Franklin, struggles to solve various mysteries, we are also immersed in the world of the gemologist. And Francis certainly makes it sound fascinating.

Particular inspiring is his descriptions of the work of Prospero Jenks, a character who uses a variety of semi-precious gemstones in his work to create a variety of beautiful objects, sort of like a British Faberge.

If you’re interested in gemstones in all its facets, including fiction, give this book a try.

October 21, 2009

Caring for opals

Filed under: caring for opals — admin @ 8:56 am

Because opal is a relatively soft stone, it must be taken care of in certain ways.

Because of the way they are constituted, opals tend to dry and crack. Therefore, avoid exposure to anything that is potentially drying (for example tramping around in 90 degree F weather for several hours, wearing an opal ring!).

Immerse the opal in water for several hours, on a regular basis. At one point it was the done thing to wipe the surface of an opal with oil – this practice has been discredited. Never wipe the surface of an opal with oil, or immerse them in oil…as this will cause them to lose their fire.

In addition, never clean opals in an ultrasonic cleaner. These cleaners can worsen inclusions and weaken color.

The advice about immersing your opals in water is only valid if it is a solid opal. If it is a doublet or a triplet, you don’t want to do this, as it can weaken the adhesion between the glue.

However it takes prolonged exposure to water to harm a douiblet or a triplet…. if you get caught in the rain or forget to take it off – just once!- while you’re showing, that should be fine.

Cleaning

Solid opal  can be cleaned –gently –with mild detergent in warm water, using  a soft-bristled  toothbrush or cloth. Do not use bleach, or cleaners with chemicals in them. Doubles and triplets should be wiped with a damp cloth, but of course never immersed in water.
Should your opal becomes scratched, or lose its shine due to small scratches or scuff marks, bring it back to an opal cutter, who can polish it to make it look like new again.

October 19, 2009

Opals – Terminology

Filed under: terminology — admin @ 2:58 pm

Here are some terms the opal enthusiast will need to know in order to fully appreciate  the magic that is opal collecting!

Andamooka opal – a type of opal from Andamooka, Australia
Black opal – a rare type of genuine opal with a dark body color
Boulder opal – genuine opal in which brown host rock may be seen
Fire opal – opal with a strong reddish or orange color, mostly from Mexico
Harlequin opal – a very rare, genuine opal that has a “harlequin” pattern.
Jelly opal – a transparent type of opal that has a jelly-like appearance

Gilson opal – this is imitation or synthetic opal
Japanese opal – plastic imitation
Slocum opal – imitation

Opals are unlike any other gemstone in that they are composed of hydrated spheres of silica. These spheres give rise to the “play-of-color,” or “mini-rainbows,” which is an opal’s distinguishing characteristic.

Opals are typically cut flat or in cabochon – no additional brilliance will be uncovered by faceting. Opal is a fairly soft stone, 5.5 – 6.5 on Moh’s scale, so thery must be treated with care.

Opal is categorized based upon the body color – light or dark – and the degree of transparency. (The body color is its base tone, not the rainbow colors in the play of light.)

Crystal – when an opal is transparent or translucent. The play of color must be visible both on the surface and within the stone.

Jelly – when the color in a crystal opal is hazy.

Fire crystal – crystal or jelly opal with an intense, fiery orange color

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