Sunday, February 26, 2012

History of The Earth's 3 Most Famous Gems


To this day, people are still debating over the effectiveness of cubic zirconia as a diamond substitute. Did you know that aside from cubic zirconia, there is a diamond alternative called moissanite?

Statistics comparing hardness, refractive indexes and dispersion don’t seem to end any arguments; to most people they are merely numbers that don’t really solve anything. Perhaps if we knew more about the gems’ histories, we would have an easier time deciding how useful each gem actually is.

So let’s delve into the past of the diamond, the moissanite and the cubic zirconia stones:


1.       History of Diamonds
Naturally, no one can say with certainty when the very first diamond was discovered. However, one can say with confidence that the role they’ve come to play in our lives truly began in the 19th century, through man’s developing knowledge of technology and word of mouth. Our new-found methods to improve cut and polish while constructing a successful advertising campaign proved a recipe for success in a time when economy was going through a growth spurt. Before the 19th century, we have vague clues suggesting that diamonds had their place in religious belief systems and ancient tools, which can be traced back to 3,000 – 6,000 years ago. It also would seem that the Indian culture may have been the source of their origin; but no one can be certain.

Their main use throughout their known history has always been adornment, due to the attractive display that results from dispersing white light into spectral colors. After all, this stunning property is their main purpose.

Between 1772 – 1797 scientists conducted experiments that were able to determine the diamonds’ composition (which is made up of carbon) and other various properties. These natural diamonds can be found in 3 typical places: cratons (where diamonds crystallized at deep depths within the earth); meteorite impact craters (where diamonds were left as deposits from asteroid impacts and were most likely not formed post-crash) and volcanic pipes (whereby rocks and minerals are transported out by magma during a volcanic eruption).

2.       History of Moissanite
Typically named after Henri Moissan, who discovered this rare mineral in 1983, this diamond alternative was initially mistaken for an actual diamond. But nearly ten years after its discovery in the Canyon Diablo meteorite, Moissan learned that its crystals consisted of silicon carbide, disassociating it from the diamond’s immediate family. However, for nearly a century it was argued whether moissanite was the earth’s natural product or whether it was a result of human abrasive tools. This question was fuelled by the fact that there were so few locations where this mineral was ever discovered. Today’s assumption is that it is in fact one of nature’s beauties, as it was discovered as an inclusion in kimberlite in a Yakutia diamond mine back in 1959.

Their debut into the jewelry industry began somewhere around 1998, but the rarity of this mineral forced the hand of the industry and so the only moissanite stones on the market today are lab-grown. Interestingly, certain properties including hardness surpass the diamonds’, but the appearance is definitely distinctive, which is why it is considered a diamond alternative and not a simulant or substitute.

Their discovery as a natural form of zirconium oxide in 1982 seemed like a hopeful yet pointless end, until a Soviet scientist figured out how to grow zirconium in a laboratory. Thanks to the Russian Space Program, cubic zirconia resulted when trying to produce a stone with the same optical properties as rubies, as natural rubies were both scarce and yet essential to the development of the lasers used by the Space Program. Cubic zirconia was then formally introduced to the jewelry industry in 1977 as “djevalite” and truly found its popularity when Swarovski & Co. decided it was worth mass production.

More good news is that manufacturers are constantly searching for ways to improve cubic zirconia and make it as competitive a diamond substitute as possible. Cubic zirconia currently fails to sparkle quite as strongly as diamonds, but they flash more in terms of rainbow color, also known as “fire”. The contradiction is quite hard to fathom.

Sunday, February 19, 2012

Why Cubic Zirconia Engagement Rings Are A Good Idea


Now that Valentine’s Day has passed – a sweet and sour day for many people – many of you might find yourself engaged. I hear wedding bells…

Approximately 2.5 million weddings per year take place in the USA alone. What does that mean in dollars? Well, let’s simplify… The average wedding costs between $20,000 - $30,000. That’s not including the engagement ring and the honeymoon that follows. If your fiancĂ© isn’t bald now, he might be after your vows.



Jewelry – often associated with deep wallet reaching – can actually help your wallet, in such a case as the Wedding Day. How, you might ask. Well, let me explain to you the benefits of cubic zirconia jewelry… (Don’t turn away just because I didn’t type “diamond” in there.) Can anyone really afford to ignore cubic zirconia in our current economical day and age? No Rockefeller, I was referring to the average, 7-11 person.

You’d love to know that at first glance, most experts can’t tell the difference between cubic zirconia and diamond stones. Now that you know appearances can be deceiving, your little heart has probably already stopped fluttering. In a comparison chart between cubic zirconia and diamonds, cubic zirconia is very competitive. In fact, here are the stats:

Properties
Cubic Zirconia
Definition:
synthesized mineral to simulate diamonds in appearance
Crystal:
isometric
Crystal Habit:
dipyramidal prismatic
Hardness:
8.05 (harder than most natural gemstones)
Density:
between 5.5 – 5.9
Luster:
adamantine
Flaws:
flawless
Color:
can be made utterly colorless
Dispersion:
0.06
Specific Gravity:
between 5.6 - 6
Cut:
facet shape is often different from that of diamond

Properties
Diamond
Definition:
natural
Crystal:
isometric
Crystal Habit:
octahedral
Hardness:
hardest
Density:
between 3.5 – 3.53
Luster:
adamantine
Flaws:
flawed
Color:
yellow/brownish tinge; colorless is extremely rare
Dispersion:
0.044
Specific Gravity:
3.52
Cut:
can be of various cuts



For us simpletons, I’ll explain to you what the difficult ones mean:
  • Isometric: To consist of three equal axes, that lie at right angles to one another (Yes - my brain’s freezing, too)
  • Crystal Habit: A description of the mineral’s external shape. A more detailed description can be found here: http://www.answers.com/topic/crystal-habit and a better understanding of the shapes’ different meanings can be found here: http://webmineral.com/crystall.shtml
  • Luster: It looks like it sounds; it’s basically the type of “shine” or how the stone reflects light. It contains two categories: metallic and non-metallic. Both diamond and cubic zirconia fall under the latter.
  • Dispersion: The color that results when white light disperses into different colors of the spectrum. Higher fractal values naturally equal greater dispersion.
  • Specific Gravity: Let wiki do the talking here; it’s so much easier for me.