Gemological Institute Of America | All About Gemstones - GIA
These are the planet’s most valued gems. Diamond. Diamonds are among nature’s most precious and beautiful creations. Emerald. Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine. Citrine. Citrine is the transparent, pale yellow to brownish orange variety of quartz.
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GIA Gem Encyclopedia | Complete List Of Gemstones
Opal. Fireworks. Jellyfish. Galaxies. Lightning. Opal’s shifting play of kaleidoscopic colors is unlike any other gem. The Facts. Opal’s microscopic arrays of stacked silica spheres diffract light into a blaze of flashing colors. An opal’s color range and pattern help determine its value.
Birthstones | Birthstone by Month - GIA
Aquamarine and bloodstone are the two birthstones for March. One evokes blue skies and calming waters while the other represents health and strength. Learn more about these two March birthstones and where they can be found. Those born in the month of April are lucky enough to call the diamond, a scintillating stone, their birthstone.
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GIA - Report Check. More information listed in the report: More information listed in the report: More information listed in the report: More information listed in the report: More information listed in the report: Want to learn more about laboratory-grown diamonds?
Is There a Difference Between Natural and Laboratory-Grown …
May 31, 2019 · One, however, is a billion or more years old and the other was recently grown in a laboratory. Both are diamonds, of course. The first is a natural diamond created by forces deep within the young Earth. The second is from a laboratory and possesses essentially the same chemical, physical and optical properties as its natural counterpart.
What Is Tourmaline Gemstone | Tourmaline Stone - GIA
Trade name for pink, red, purplish red, and orangy red tourmaline. It’s not unusual for pink tourmalines to have eye-visible inclusions. This beautiful tourmaline mineral specimen is from California. The specimen displays tourmaline’s characteristic columnar form. Fantastic pink tourmaline crystal with quartz with other minerals.
What is Topaz Gemstone | Topaz Stone – GIA
Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color. Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions.
Alexandrite Gemstone | Natural Alexandrite Stone - GIA
Alexandrite is the color-change variety of the mineral chrysoberyl. Alexandrite is bluish green in daylight or fluorescent light. Alexandrite is purplish red in incandescent light or candlelight. This alexandrite specimen is made up of three interpenetrant crystals. Brazil is one of the most important alexandrite sources.