December Blues - Topaz and Turquoise

December's birthstones, turquoise and blue topaz, each possess their own shade of light blue to honor either the northern hemisphere's deep winter ice, or the southern hemisphere's bright summer skies.

Topaz is mined from locations that span the globe.  Naturally occurring blue topaz is very rare.  While topaz can exists in a wide variety of colors, it is mostly found in a range of browns, oranges, reds, and yellows.  Most blue topaz gems on the market are formed by irradiating topaz in a laboratory to create the desired blue color.  However, some natural topaz of a very light blue hue is cut and drilled for beaded jewelry.  It's hardness of 8 on the Mohs scale means it is a durable stone, and so suitable for a variety of jewelry designs.  The stone is symbolic of creativity, individuality, and self confidence.

The characteristic blue shades of turquoise are formed by the presence of copper in the mineral.  While the turquoise mineral can be found in hues that include greens and yellows, it is the blue-aqua shade that has the most value.  Gem quality turquoise is found in a few specific locations on Earth, and such material commands a good price.  Imitation turquoise is becoming very common, but does not usually have the same richness as the original.  This mineral can range in hardness from 5-7 on the Mohs scale, which means some of the softer varieties need special care.  Pieces can shatter if dropped or mishandled.  Turquoise is said to bring the wearer protection, friendship, and peace.  There are those who believe that pairing the stone with copper metal helps to increase the beneficial effects.  Certainly both copper and silver match beautifully with turquoise in beaded jewelry.

Choose your own preferred shade of light blue for your jewelry expressions this month, and feel in tune with the season!

Image Credit:  Turquoise Beads by cobalt123 on flikr via Creative Commons, CC 2.0
Blue Topaz Mineral, Smithsonian Institute, The Dynamic Earth

October's Birthstone: Opal

Radiant, colorful opal is the birthstone for October. There are several theories about the origin of the word “opal,” but the most probable is that it is derived from the Sanskrit word upala, which means “valuable stone.”

The aborigines of Australia have an ancient story about how opal was created. The Creator descends to earth, bringing a message of peace to humanity. The Creator’s foot touches the earth, and the rocks in that spot suddenly come to life and begin to glitter in a variety of brilliant colors. Those sparkling rocks became opal.

Most of the world’s opal, 95-97%, is mined in Australia--hence the creation story--with a small amount produced in the Americas. Opal is related to quartz; but unlike quartz, it is not a mineral. It is instead a kind of silica, and is found in various types of rocks. The most commonly found colors of opal are greens and whites, and the red/black combination is the most rare.

Opal’s most notable characteristic--its glittery, colorful radiance--is know as “play of color.” In the 1960’s, scientists discovered that within opal, tiny spheres of silica interrupted the passage of light through the gemstone, causing the light to refract. This answered a question that until then no one could answer--why opal produces the lovely play of color that makes it so popular.

If you’re looking for an alternative for an October birthstone, pink tourmaline is a beautiful choice. Because it is classified as a semi-precious stone, it is more expensive than opal. Tourmaline comes in a variety of colors, including one called “watermelon” which is green on the outside and pink on the inside.



Photographs of Opal by Opals-On-Black
Photograph of Tourmaline Ring by Liverpool Design Festival