Stones and Gems Education

What is a Gemstone?

A gemstone is the name given to a piece of mineral, rock, or organic material. When used in jewelry, gemstones can be displayed in their raw ("uncut" or "rough") state, but are usually ground and polished into one of many different shapes, or "cuts". There are hundreds of different gemstone cuts, but these 9 shapes are some of the most popular.

The cut of the stone greatly affects how the gem reflects light and sparkles. Cuts vary in number of facets and angles. Visit the GIA website for a great tool that allows you to see how differences in gemstone cuts effect a stone.


Guide to Gemstones

We recommend you look on the American Gem Trade Association website to explore all kinds of stones! Another great resource is the GIA Gem Encyclopedia, which allows you to sort stones by color and also see images of how they would look as a rough vs. polished stone. Be sure to ask us if you want something that you can’t seem to find on our website – we can ethically source a large variety of stones. Here are some popular colored stones.

Diamond Jewelry: A classic Choice

With different styles and carats, our diamond rings present a versatile selection for any taste or budget. All Jewelry by Johan diamonds are sourced ethically and are conflict free. We follow the Kimberly Process, which ensures that Diamonds bought and sold are not sourced from forced labor or other illegal activity. Colorless diamonds are the classic choice for an engagement ring, but there are also a wide variety of other diamond colors to choose from.

Black Diamonds

At Jewelry by Johan we adore all assortments of diamonds, especially black diamonds. It seems that black diamonds are making their way to the forefront as a popular diamond color alternative in the jewelry industry. It is easy to see why. Black diamonds have a very mysterious quality about them that makes them that much more beautiful and interesting when used in jewelry.

Colored Diamonds

Rediscovering our love for black diamonds got us wondering how exactly do diamonds receive their other colors? It turns out that the coloring comes from the atomic structure of a gem shift, which creates a one of a kind hue in the stone that casts a bounty of different shades, to our favorite black, to the faintest of pink. The price of the diamond often depends on the scarcity of it. Pink diamonds are the hardest to locate and one of the most expensive diamond shades. Black diamonds are also a more budget friendly alternative to a classic white stone, which makes them a very popular alternative.


Specifications Of A Diamond – The 4 Cs

Diamonds are graded by these four standards developed by the Gemological Institute of America (GIA)

  • Carat: The weight of a diamond, 200 milligrams is 1 Carat.
  • Color: The whiter the diamond, the better.
  • Clarity: Having a clear diamond means having one without inclusions (Almost like small scratches and marks on the inside). Clarity is measured from FL to IF (Flawless), VVS1 to VVS2 Hard to find imperfections when magnified by 10), VS1 to VS2 (Imperfections are hard to see with the naked eye), SI1 to SI2 (Imperfections can be found when magnified by 10), I1 to I3 (Imperfections can be found by the naked eye)
  • Cut: How well a diamond is cut controls how effectively it reflects light. The better it reflects light, the brighter and more fiery it will appear.

Moissanites: A Popular Diamond Alternative

Forever Brilliant® is the world’s most brilliant gem®. Inspired by the beauty and fire of natural moissanite, discovered over a century ago by Dr. Henri Moissan, Charles & Colvard® patented an ethical process for growing gem-quality Moissanite. More brilliant than a diamond at a fraction of the cost, more durable than a sapphire, ruby, or emerald, nothing compares to or outshines Charles & Colvard Created Moissanite®. Forever Brilliant® is our brightest, whitest gem ever; the result of new innovation and artistry that reveals maximum brilliance and fire. Artfully created from Silicon Carbide, the world’s second hardest mineral; the beauty of Forever Brilliant® created by Charles & Colvard® is guaranteed to last forever.


We Can Create Any Piece of Jewelry Using Your Stone

Send us the gem you want in your custom ring if you already own the perfect stone for your dream ring! You can give your ring just that much more sentimental value while lowering the price!