Why are most minerals not popular as gems?

There are millions of minerals that exist on the earth, but few of them are prized as gems and used for adornment. Many of them aren’t in colors that are usually highly prized for jewelry. Or they’re not able to be cut and polished to be made wearable as jewelry.

Often it’s a matter of changing taste and times. In Imperial Russia and in the Victorian era, the mineral malachite and other opaque minerals were highly valued as gemstones jewelry. It is often a by-product of copper mining, and is distinguished by a brilliant green color, with dark concentric circles of color swirling through it. It’s not as highly valued because it’s easily available and not as expensive as an emerald or ruby. But there is an entire room devoted to malachite in the Russian museum, the Hermitage, as testament to its desirability among the most privileged class of people.

There have been discoveries that indicate that malachite was mined in Egypt as early as 4,000 B.C. It’s a soft gem, and easily carved and shaped. It polishes to a beautiful, rich sheen. But still is not highly prized in the U.S. as a gemstone.

Very often some minerals simply shouldn’t be used as gemstones, but because of their beauty, people wear them as such anyway. A moonstone is one such gem. It’s relatively soft, with a rating of 6 on Moh’s scale of mineral hardness, compared to a diamond’s hardness rating of 10. It’s a type of mineral called orthoclase, but when it exhibits a translucent, milky quality, it’s then called moonstone.

Other minerals exist, but are simply not prized for gemstones. Among the more common minerals, quartz stands out as one that can be used for jewelry, as well as decorative items.

Common and uncommon gemstones

Gemstones quite literally can take our breath away when we see them. Who hasn’t seen a beautiful diamond or sapphire ring and exclaimed over it? Is it only their beauty that makes them so valuable? Why else are they valuable to us?

Most gemstones are minerals that occur naturally in the earth. The most common is quartz, which is made of silicon and oxygen, two of the most common chemicals or substances on the planet. Even though most people don’t find such crystals unless specifically looking for it, it’s still relatively common in the gem world.

One quality that determines the value of a gem is how rare it is. A diamond, believe it or not, is actually a more common gemstone. However, the sales and distribution of diamonds are tightly controlled, which keeps the demand for diamonds of any characteristic in high value. Certainly perfect, flawless diamonds are truly rare, but diamonds themselves aren’t particularly rare.

Other gemstones are much rarer, such as sapphires and rubies, which are part of the beryl family of minerals. Rubies are rarer than sapphires and top quality colors in both are extremely rare.

A mineral called benitoite is found only in the San Benito valley in California, where only a few hundred carats of it are found each year. It is the state gem of California and is a hexagonal-shaped crystal. It can be cut and polished to produce sapphire-colored gemstone jewelry.

Some gems are even rarer than bentitoite. They’re so rare, that only three or four of them exist in the world. And the location where the gemstone was found can make a big difference as well. While peridot is a fairly common gem, there were actually several carats of peridot discovered in a meteorite, making that one of the rarest gems ever!

Gemstones are mineral crystals

What specifically are gems and gemstones? We know some of the most common ones – emeralds, rubies, sapphires and diamonds. But what exactly are they, how are they made and why we do we prize them so highly?

The International Gem Society defines a gem as "a mineral that has been chosen for its beauty and durability, then cut and polished for human adornment."

Most gems are minerals. Others, like pearls or amber, are created from living organisms. Usually gems are of a color that mirrors other natural elements we consider beautiful or valuable. Emeralds mirror the lush green of plant life, sapphires are the color of the sky and rubies are a rich blood-red. There are variations in color in all of these gems, of course, and in diamonds, but those are the colors most normally associated with them. Diamonds can come in colors as well, with pink and canary diamonds being highly prized variants.

Most gems are hard and durable, although pearls can be easily damaged, as can opals and moonstones. Usually a gemstone has to be durable enough to wear as adornment, but others, while too soft to wear, are valued by collectors. Pearls can eventually disintegrate, even if all you do is wipe dust off them. And if you spray hairspray or perfume on them, this can also damage your pearls.

Opals are highly prized for their beauty and fire and make exquisite jewelry, but are extraordinarily susceptible to damage. They can shatter easily if dropped. And there’s a story of a woman who wore an opal brooch to a holiday party. When she left the warmth of the party to leave and the brooch experienced the sudden drop in temperature, it shattered, just like a glass that’s been heated and then cooled too quickly.

Minerals are crystals

The earliest forms of jewelry were items that early humans found naturally, such as shells or bits of bones. Early gravesites have also revealed that pre-historic man buried his dead with flowers and with carved ivory beads. These primitive beads would have taken at least an hour each to make.

Early man also might have found bits of turquoise that occurred naturally in areas of Turkey and North America. The pearlescent swirls found inside an abalone or conch would have also been used as jewelry.

They might have also found the earliest types of precious gems in the form of natural crystals, such as quartz or diamonds. Crystals are solid substances where the molecules are arranged in a symmetrical fashion, and they generally fall into one of six shapes:

Isometric, or cubic crystals are shaped like blocks and are symmetrically shaped. An example of an isometric crystal would be pyrite. This is also called fool’s gold because it has a metallic yellow or brassy color similar to gold.

Tetragonal, where the crystals are shaped like four-sided prisms and pyramids. An example of a tetragonal crystal is the zircon.

Hexagonal crystals are shaped like six-sided prisms, or pyramids. An example of this kind of crystal is the beryl, which includes gems like emeralds and aquamarines.

Orthorhombic crystals. An example of an orthorhombic crystal is topaz. Topaz can come in a variety of colors, although the mostly highly prized is a deep amber color. At one time, topaz was much more valuable, until rich veins of it were found in Brazil, which devalued the market.

Monoclinic crystals are short and stubby, with tilted faces at each end. Monoclinic crystals include gypsum.

Triclinic crystals are usually flat with sharp edges but no right angles. Each crystal has three unequal axes. An example of triclinic crystal is feldspar.

Palaeolithic age

As a species, we love to adorn ourselves with jewelry, makeup, hair accessories. We do it now to enhance our looks, to attract a mate and because it just makes us feel good about ourselves. Some forms of adornment are symbolic – like wedding rings. Or they’re used to make a statement about our lifestyle, like multiple piercings and earrings.

Have you ever wondered what the origins are of such self-decoration? Was there a meaning behind it? Or did we just start wearing beads, necklaces and earrings as our awareness of self increased and as we evolved?

We know that the earliest jewelry of bits of bones, shells and other personal adornments appeared in graves about 40,000 years ago. The idea that there was an afterlife, and the belief in spirits both good and bad, gave rise to the means to attract the good spirits and ward off the bad ones.

People protected themselves from evil spirits with adornments in the form of necklaces or bracelets, and pierced themselves with the same bones and shells to have these amulets on their persons at all times. At this time people also started painting their bodies with red ochre, which can be considered the earliest form of makeup. They also started lining their eyes with kohl to protect themselves against the force known as the "Evil Eye."

Even today, much jewelry takes the form of amulets. People wear crosses around their necks, or the Star of David, or wear a claddagh ring – all to attract good fortune or ward off bad luck. There are even more throwbacks to this earliest form of magic, such as a lucky rabbit’s foot, or a lucky penny. Or we often have less well known, more personal amulets that have a meaning to us alone, but are still worn as good luck charms and amulets.