Gemstone Learning Center

GEMSTONE LEARNING CENTER

Gemstones are all about color, but here’s how the jewelry industry separates the best from the rest.

Gemstone Quality

Unlike diamonds, gemstones are given an overall quality grade based on a variety of factors. These characteristics include color, color consistency, clarity, and cut quality.

AAA-grade gemstones: considered to be near-perfect, with a color that has high, well balanced saturation, a quality cut, and few to no inclusions.

AA-grade gemstones: well cut, slightly less vibrant than AAA stones, with very good brilliance and polish. May have slight inclusions.

A-grade gemstones: less saturated in color, may have moderate-heavy inclusions.

Commercial-grade stones: are usually cloudy with poor color quality, not suitable for precious gemstone jewelry and not sold by Pratiksha.

AAA
AA
A
Commercial

Top quality gemstone, eyeclean with exceptionally vibrant color, tone, brilliance, cut/polish. See all AAA quality gemstones

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Pratiksha does not carry commercial gemstones.

Gemstone clarity

Authentic gems vary greatly in clarity, as natural inclusions are much more present within certain precious stones. Emeralds, for example, often include visible inclusions that add character and evidence of authenticity. Clean stones are determined to not have any inclusions present to the naked eye.

Clean
Slightly Included
Moderately Included
Heavily Included

No internal or external characteristics. Extremely rare. See all Clean gemstones

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Gemstone Carat Weight

The carat of a gemstone refers to its weight, and 1 carat is equivalent to 200 milligrams. Independent of a gem’s size, two stones with the same carat weight may appear slightly different in size. It’s important to understand and evaluate the relationship between a gemstone’s carat weight, color and cut to get the best value out of a stone. Choosing a gemstone that is a few carat weight points below your ideal carat (0.49 carats vs. 0.50 carats) can translate to significant savings.

Use the slider below to understand how carat weight works.

0.25CT
0.50CT
0.75CT
1.00CT
1.25CT
1.50CT
2.00CT
3.00CT
4.00CT
5.00CT

See all 0.25 carat gemstones

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Gemstone Shape

The shape of a stone heavily influences the overall design and mood of the jewelry piece. A gemstone’s shape can help show off the gem’s best hue and transform the look of the piece.

Cushion Modified
Round
Oval
Princess
Pear
Emerald
Radiant
Bead
Briolette
Bullet
Half Moon
Heart
Kite
Marquise
Slice
Square
Straight Baguette
Tapered Baguette
Trapezoid
Triangular
Trillion

Once referred to as the old mine cut, cushion combines a square cut with rounded corners, similar to a pillow. Cushion cut gemstones have soared in popularity, and while slightly less brilliant than round cut gems, they often have better fire. See all cushion modified shape gemstones

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Gemstone Origin

As all gemstones are naturally occurring, it’s helpful to understand the geography of where certain stones are mined and discovered. Many stones are much more elusive and rare from certain parts of the world. Tanzanites, for example, are only found in one place in the world: Tanzania. Russian alexandrites are much more valuable than other alexandrites because they haven’t been produced for over a century.

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Alexandrite
Aquamarine
Emerald
Garnet
Morganite
Opal
Ruby
Sapphire
Tanzanite

Alexandrite is found in the chrysoberyl family, and has unique color-changing property when illuminated in different light. The Russian variety of this pleochroic gemstone appears greenish in daylight, and reddish in incandescent light. Other varieties can appear yellowish or pink in daylight, and raspberry red by incandescent light. Russian alexandrites are considered to have the most color-change and are the most sought-after. See all Alexandrite

  • Brazil - rich blue green to purplish red color-highly valuable

  • Russia - rich blue green to purplish red color, slightly darker and less clean than Brazilian Alexandrites. Highly valuable and extremely rare

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