Category Archives: Black Hills Gold jewelry

Birthstone of the Month: the Opal, October’s birthstone

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ER927 Earrings

APPEARANCE OF THE OPAL

The Opal has no crystalline structure, as do most gemstones, but instead is comprised of varying sizes of minute, spherically grouped chains of silicon and oxygen. The more precious the Opal, the more organized the groups of spheres and the more consistent their sizes. This resulting structure creates a changing play of colors as light is dissected and diffracted through the spheres at different wavelengths creating all the colors of the rainbow. It is this colorful, translucent appearance that gives us the term “opalescence”.

HISTORY OF THE OPAL

Almost 95% of all Opals come from Australia, where billions of years ago a vast sea which covered Continue reading →

Birthstone of the Month: Sapphire, September’s Birthstone

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Sapphire

APPEARANCE OF SAPPHIRE

The most celebrated Sapphires are a rich, deep blue but Sapphire may be any color except red. Yellow, green, white, purple and even pink-colored corundum is referred to as Sapphire while true red-colored corundum is known as Ruby. While trace amounts of chromium result in the Ruby’s red color, it is other elements, notably iron and chrome that result in the different colored stones referred to as Sapphires. Continue reading →

Birthstone of the Month: Peridot, August’s Birthstone

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Peridot

APPEARANCE OF PERIDOT

The Peridot (pronounced: pair•a•doe) is the yellowish to olive green gem variety of the mineral olivine. Olivine itself is comprised of two other minerals, fayalite and forsterite, the main composition of each being iron and magnesium, respectively. Though most Peridot is the magnesium rich forsterite, it’s the amount of iron in olivine which contributes most to the final color of Peridot, with amounts less than 15% resulting in the higher quality gems. Other trace elements that contribute to its color are nickel and chromium.

Like other gemstones, Peridot crystals are formed by intense heat and pressure beneath the Earth Continue reading →

Birthstone of the Month: the Ruby, birthstone of July

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Ruby

APPEARANCE OF THE RUBY

The Ruby is the red variety of corundum, the second hardest natural mineral known to mankind. Although pure corundum is virtually colorless, the inclusion of trace amounts of chromium in it result in the Ruby’s red color. Other elements, such as iron will result in different colors, but all these varieties are referred to as sapphires. Only the red variety qualifies as Ruby.

Like other gemstones, Rubies are formed by intense heat and pressure beneath the Earth over millions of years. Interestingly enough, the chromium within the corundum tends to cause cracks within the crystalline structure. These cracks make it very difficult to find Rubies larger than about 3 carats. Consequently, larger Rubies, as well as those with minimal inclusions bring some of the highest prices paid of any gemstones in the world. Continue reading →

Birthstone of The Month: Smokey Quartz and Alexandrite, June’s Birthstones

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SMOKEY QUARTZHISTORY OF SMOKEY QUARTZ

Today more than ever people tend to forgo tradition in favor of personal flair, and when it comes to choosing a birthstone, that trend is evident. Because there are various kinds of birthstones – modern birthstones, traditional birthstones, mystical birthstones, different birthstones for different cultures – people who do not like the looks of their birthstone certainly have a choice. This is clearly true for the month of June, for which a number of birthstones have been claimed. According to the American National Association of Jewelers, Alexandrite has been the regarded the official birthstone for June since 1912. But Pearl, Moonstone and even Opal have been named June birthstones as well. And more recently, Smokey Quartz has become a popular choice.

Alexandrite was named after the Russian czar Alexander II, it’s discovery supposedly occurring in the Ural Mountains of Russia on either the day of his birth, or his coming of age. Alexandrite is a variety of the mineral Chrysoberyl, a very hard and rare gemstone. So rare, in fact, that genuine Alexandrite is very scarce and hardly ever used in modern jewelry making.

Consequently, either synthetic Alexandrite or alternate genuine gemstones such as Smokey Quartz, which resemble Alexandrite, are typically used as the birthstone for the month of June. Continue reading →