Color Gemstones Choosing Guide

Posted by admin 28/08/2018 0 Comment(s)


4 Cs

Gemstones have been through several processes to become refined and valuable. Each step requires delicate craftsmanship and difficult techniques in order to turn a rock into a gem. In general, gemologists and jeweler use 4 Cs criteria to define the quality of gemstones: Cut, Clarity, Color and Carat.



There are three fundamental purposes of gemstone cutting­–maintaining the body of the stone, enhancing the color of the stone and reducing inclusion of the stone.

The cutting will improve clarity and quality of gemstones. When selecting a gem, first thing which should be considered is “symmetry of the facet”. The more symmetrical and proportional gemstones are, the higher quality they are priced at.



When gemologists talk about clarity what they actually look at is inclusion. Inclusions categories are divided by how clearly visible the stones are. The highest clarity level is called “free of inclusion” which means there are very little to none inclusion. Using 10x magnification cannot detect the inclusion.

“Very lightly included” and “moderately included” are the next two level that are acceptable and the inclusion does not affect the stone durability. The least acceptable level of inclusion is heavily excluded which inclusions affect stones durability and beauty.



Gemstones appear in many different color. Their color can be categorized into 3 different aspects–hue, tone and saturation. Different stones can have similar hues. Therefore, when choosing a stone, you need to know what kind of stone you want and what color it appears.

Then tone of the stone will be considered. Gemstones should not be too dark or too light that the color cannot be identified. Clear and vivid color are usually more valuable. Last, high saturation stones are more popular than low ones. Stones that look grey or brown are less valuable. Therefore, you should look for a stone that has vivid color with high satura3tion.



First thing you need to know is Carat is the weight not the size. Two stones with the same carat weight can have differently visible sizes. For example, ruby in general has high density that affect its weight. One carat ruby will appear smaller than one carat diamond thanks to their different density.

If you are choosing a stone based on carat weight, try to look for a large crown and table which give a stone larger appearance. Sometimes, small carat stones can be expensive since the smaller they are, the less inclusions they have. One carat stone with no inclusion can be very valuable.


Now that you know about basic criteria of gemstones selecting, you can confidently search for stones that suit your design and purpose. The final recommendation I want to share with you is you can ask the dealers if they have any certificate from gemstone institutions to prevent from getting ripped off by a non-association member. Vettri Gems USA is a member of ICA (International Color Gemstone Association), AGTA (American Gem Trade Association), DCA (The Indian Diamond and Color Stone Association) and JBT (Jewelers Board of Trade). We guarantee our customers best quality, best price and highest satisfaction.

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