Vol.02Why Do Jewelry Pieces Sparkle?
The Science of Brilliance | The Story of Light Behind the Sparkle.
Why are we so captivated by the sparkle of jewelry?
A diamond catching the light at your fingertips.
Gold quietly gleaming at your neckline.
Gemstones revealing different facets with every change in angle.
Their beauty is no accident.
The sparkle of jewelry is deeply influenced by the properties of light, the characteristics of materials,
and the techniques refined by human hands.
This time, we will explore the sparkle of jewelry that captivates us from a scientific perspective.
01｜The Journey of Light Within Gemstones.
One reason gemstones sparkle is a phenomenon of light called “refraction.”
When light passes from the air into a gemstone, its direction of travel changes.
This is called the refraction of light.
The refractive index varies depending on the type of gemstone, which affects how light travels through the interior and the way it reaches our eyes.
For example, the refractive index of a diamond is approximately 2.42.
This high refractive index, combined with a carefully designed cut, creates the intense sparkle unique to diamonds.
Light that enters a gemstone reflects off multiple facets, and some of it is released back out.
This is the light that reaches our eyes, creating the beautiful sparkle we perceive in gemstones.
02｜The Art of Cutting That Creates Sparkle.
One of the most important factors determining a gemstone’s beauty is its cut.
Especially in diamonds, the angle, proportions, symmetry, and polish of the cut
greatly affect how light is returned.
A diamond’s sparkle is described by three main optical characteristics.
Brilliance｜Brilliance
The brightness of the white light returned from the diamond.
Fire｜Fire
The rainbow-colored shimmer created by the dispersion of light.
Scintillation｜Scintillation
The play of light and dark that appears when the gemstone, light source, or viewer moves.
The combination of these characteristics
allows diamonds to reveal a wide range of expressions depending on the viewing angle and lighting environment.
Human skill gives new beauty to minerals created by nature.
The cutting of gemstones embodies both science and art.
03｜Why Jewelry Loses Its Sparkle.
Even jewelry with a beautiful sparkle can change over time
as it is worn day after day.
Sebum and sweat secreted by our skin, as well as hand creams and cosmetics,
gradually accumulate on the surface of the jewelry.
Diamonds, in particular, have a tendency to attract oils to their surface.
When dirt accumulates on the surface or back of a gemstone,
it can affect how light reflects and passes through, making the gemstone’s original sparkle harder to see.
The areas around ring prongs and the back of the settings that hold gemstones
are also prone to accumulating dirt in everyday life.
When jewelry looks duller than before,
it does not necessarily mean that the gemstone itself has lost its beauty.
Dirt on the surface may be blocking the path of light.
04｜The Different Roles of Cleaning and Polishing.
Cleaning and polishing are two methods for keeping jewelry beautiful.
Although they may seem similar, they serve different purposes.
Cleaning
Removing sebum, oils, and other dirt accumulated on the surface or in the small crevices of jewelry.
Cleaning with a method suited to the material
can sometimes restore the sparkle that was obscured by dirt.
Polishing
Buffing the surface of the metal to smooth out small scratches and irregularities.
While polishing can create a beautiful finish,
it also removes a tiny amount of metal from the surface,
so repeated polishing may alter delicate designs and contours.
This is why it is important to use daily care to remove dirt and
to properly distinguish it from professional repair and polishing.
The appropriate cleaning method varies depending on the type of gemstone, whether it has been treated,
and the surface finish of the metal.Not all jewelry can be cleaned in the same way.
05｜To Enjoy Its Beauty for Years to Come.
The sparkle of jewelry is the result of the properties of materials created by nature
and the techniques accumulated by human hands.
There are things we can do in our daily lives to enjoy that beauty for a long time.
Pay attention to the condition of the jewelry you wear.
Avoid allowing dirt to accumulate, and clean it carefully using a method suited to the material.
And when necessary, seek maintenance from a professional.
Through the habit of washing jewelry, Amau
proposes a lifestyle of caring for precious things for a long time.
Not only the joy of wearing jewelry,
but also the time spent appreciating its sparkle can become a beautiful part of everyday life.
Knowing sparkle means valuing beauty.
Amau
References｜Bibliography
Gemological Institute of America (GIA). Diamond Cut: The Wow Factor. 2016.
Moses, T. M., et al. A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds. Gems & Gemology, 2004.
Gemological Institute of America (GIA). How to Clean Your Diamond Jewelry. 2012.
Gemological Institute of America (GIA). Tips on Caring for Jewelry.
Gemological Institute of America (GIA). Prefinishing, Polishing and Buffing.