Guide to Reading Gemports: Colored Gemstone Reports
The Gemports Colored Gemstone report reference document serves as a crucial tool for industry stakeholders worldwide. As a co-creator, the Thai Gem and Jewelry Traders Association (TGJTA) is committed to promoting transparency and establishing internationally recognized standards. This guide has been created to ensure the report can be applied to its fullest potential.
Understanding each component of the report is the primary step to using it with maximum accuracy.

(Sample Gemports Report Table – Ruby and Blue Sapphire)

(Sample Gemports Report Table – Ruby)

(Sample Gemports Report Table – Blue Sapphire)
· Q1: January 1 – March 31
· Q2: April 1 – June 30
· Q3: July 1 – September 30
· Q4: October 1 – December 31
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Example 1: Ruby Price Calculation
Step 1: Select the table: "MYANMAR: (1.00-10.00 CT): Q4 2025".

Step 2: Find the reference price per carat.:
For a 2.5 ct Ruby, look at the 2-2.99 ct range. Since it is untreated, select the "Nature" column. For an Intense Red color, select the "Intense Red" row. The resulting reference price is 48,130 USD/ct.
Step 3: Calculate the value by substituting the numbers into the formula
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= 48,130 USD/ct × 2.5 ct
= 120,325 USD
* Note: This is the maximum opening price reported for the specified quarter
Example 2: Sapphire Price Evaluation
Step 1: Select the table: "Sri Lanka: (1.00-20.00 CT): Q4 2025".

Step 2: Find the reference price per carat.:
For a 3.2 ct Sapphire, look at the 3.00-4.99 ct range. Since it is treated, select the "Heat" column. For a Vivid Blue color, select the "Vivid Blue" row. The resulting reference price is 3,880 USD/ct
Step 3: Calculate the value by substituting the numbers into the formula
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Exchange Rate (Currency) / USD – If currency conversion is not required, please leave this field blank.
= 3,880 USD/ct × 3.2 ct
= 12,416 USD
* Note: This is the maximum opening price reported for the specified quarter
Reference & Standards
Reference Criteria: The prices shown represent the maximum price for top-quality gemstones that meet these six highest criteria:
Color Grading Standard & Trade Terms:
Color grading follows the Chinese National Standard, which varies by gemstone type:
The report also provides clear definitions for key Trade Color Terms:
Application for Industry Stakeholders
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