Gem Information

Like flowers, colored gemstones come in every hue, tone and saturation. Both are born of Nature and evolve into something exquisite. But, unlike flowers whose beauty fades with time, the beauty of colored gemstones is everlasting.


Gemology or Gemmology is the science dealing with natural and artificial gemstone materials. It is considered a Geo-science and a branch of mineralogy. Some jewelers are academically trained gemologists and are qualified to identify and evaluate gems.

Buying Gemstone

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About GemLab Laboratories

Incorporated in the year 2000, has attained pinnacle status in gemstone testing and its certification field over the years.  However, the success of is not a mere coincidence, but it has achieved pioneer status in the gemstone certification industry with its rigorous hard work, continuous research and synergy with highly skilled professionals and industry insiders.

Types of Gemstones

Yellow sapphire

Yellow Sapphires, are simply crystallized alumina (Al2O3) and in their pure form are devoid of color. Yellow sapphire connected with Jupiter mostly found in Srilanka with Hardness of 9 on the Moh’s scale which makes Yellow sapphires one of the strongest natural gemstones in the world.

Blue Sapphire

Blue sapphire is a natural occurring gemstone of the corundum family with Mohs scale 9 basically. Blue Sapphire ranges in hue from pale to deep azure or dark royal blue, to indigo. Mostly Blue Sapphiredeposits are found in Eastern Australia, Thailand, East Africa, Sri Lanka, Madagascar and China (Shandong).


Emerald is the Green color stone with a hardness of 7.5 – 8 Mohs scale. found mainly in Columbia, Brazil, North Carolina USA. Emerald is the birthstone of month May. Dull green or grayish-green shade is also possiblein emearlds. Only emeralds of the highest quality are transparent.


Coral symbolizes life and blood force energy. Coral is a product of the sea and hardness is less than 4 on the Moh’s scale. Corals are found in India, Italy, Australia, Sri Lanka, Japan, Malaysia, South, Africa, Algeria and U.S.A. On the other hand, coral is organically formed under the sea over thousands of years.


The name Ruby comes from Latin ‘Rubrum’, which means ‘Red’. Ruby, which is corundum, is simply crystallized alumina (Al2O3) and in pure form it is devoid of color and hardness is 9 on the Moh’s scale. The rich color in Ruby is mainly due to small amounts of chromic oxide


Its name comes from Greek ‘esson’ meaning ‘inferior’, since this gemstone is supposed to be less valuable. Hessonite or Gomedh is a Gem of the Garnet family with hardness of 7.25 on the Moh’s Scale and Refractive Index is 1.74. The color is like honey shining under a ray of light.