GIA Thailand

GIA Thailand Every gem has a story. Every gem has a story — shaped deep within the earth and revealed through science.

At GIA, we bring those stories to light through science, discovery and education — inspiring trust and confidence in gems and jewelry for nearly 100 years. At GIA, we’ve been uncovering those stories for nearly 100 years. As a nonprofit, our mission is to inspire confidence in gems and jewelry through research, discovery and education. From inventing the 4Cs of diamond quality to developing instruments used worldwide, GIA continues to push the industry forward. This is GIA: where science meets human imagination to inspire a world of trust.

Sapphire is best known for its rich blue color, but this remarkable variety of corundum occurs in nearly every color of ...
25/09/2026

Sapphire is best known for its rich blue color, but this remarkable variety of corundum occurs in nearly every color of the rainbow. The only exception is red corundum, which is classified as ruby rather than sapphire.

Padparadscha: An exceptionally rare pinkish orange to orangy pink variety. Often the most valuable fancy-color sapphire.

Orange: Deep golden to mandarin and deep orange colors.

Yellow: Bright hues ranging from pale lemon to golden yellow.

Green: Often more subdued, with subtle blue and yellow undertones.

Blue: The classic sapphire color. The most prized gems display vivid cornflower or royal blue hues, though lighter blues also occur.

Purple: Can range from soft lavender to rich purple.

Pink: Ranges from delicate pastel to vivid hot pink, with saturated colors being the most valuable.

Which is your favorite sapphire color?

For centuries, people believed rubies contained an eternal fire. Looking at this magnificent gem, it's easy to see why.T...
23/09/2026

For centuries, people believed rubies contained an eternal fire. Looking at this magnificent gem, it's easy to see why.

This natural ruby originated in Myanmar (Burma), a source renowned for producing some of the world's most celebrated rubies for more than 2,000 years.

Its "pigeon's blood" color is among the most coveted in the trade. The secret behind its mesmerizing glow? Chromium and very little iron. These trace elements gives ruby its vivid “pigeon’s blood” red color and creates a red fluorescence that can make exceptional stones appear to glow from within—even in natural daylight.

What makes this ruby even more extraordinary is that it is untreated. Most gem-quality rubies are heat treated to enhance their appearance, making fine untreated examples especially rare and prized.

With its legendary origin, exceptional color and untouched natural beauty, this ruby reminds us why these gems have inspired wonder for thousands of years.

What do you think about this stunning ruby?

Alexandrite is one of the rarest and most fascinating gems in the world—celebrated for its remarkable ability to change ...
17/09/2026

Alexandrite is one of the rarest and most fascinating gems in the world—celebrated for its remarkable ability to change color under different lighting. Though it’s important to note alexandrites from different locales can have different appearances. Over decades of research, GIA scientists have documented the distinct characteristics of alexandrite from major sources around the world to support geographic origin determination.

Russian alexandrite from the Ural Mountains remains the historic benchmark, prized for its dramatic shift from green or bluish green in daylight to red or purplish red under incandescent light. These stones are often relatively clean and may contain tourmaline inclusions and rounded, cotton-like cloud inclusions.

Brazilian alexandrite is highly sought after—particularly from the important Hematita deposit in Minas Gerais. These stones are often bluish green in daylight, shifting to purple or purplish red, and may contain metallic sulfides, wispy clouds, and fluorite crystals.

Sri Lankan alexandrite is known for producing large, eye-clean stones. Material often displays yellowish green hues in daylight and shifts to brownish or orangy red, typically with a softer color change. Fingerprint inclusions, brown zoning, and long sillimanite needles are common.

Indian alexandrite often shows a strong color change, ranging from green or bluish green to a distinct reddish purple. Tiny needle-like inclusions and reflective particles can create unique fingerprint-like internal patterns.

Other important sources include Tanzania, Madagascar and Zimbabwe.

Learn more about major alexandrite origins on our website: https://bit.ly/4vgiuyQ

Join us for the GIA Gem Talk: “An Update on GIA Colored Stone Origin Determination”Presented by Wim Vertriest, Manager, ...
15/09/2026

Join us for the GIA Gem Talk: “An Update on GIA Colored Stone Origin Determination”

Presented by Wim Vertriest, Manager, Field Gemology

For over a decade, there has been increasing demand in the trade for colored stone origin determination. These services and analytical procedures are constantly evolving.

During this presentation, we will take you through GIA’s scientific approach to origin determination, including an exploration of advanced technologies used to determine the geographic origin of different gemstones.

🗓 Wednesday, September 30, 2026
⏰ 6:30 - 7:30 PM
📍 GIA Diamond Room, 19th Floor, Mitrtown Office Tower

Register: https://shorturl.at/4WNve

Thank you for visiting GIA at the Bangkok Gems and Jewelry Fair. See you again next year!ขอบคุณที่มาเยี่ยมชมบูท GIA ของเ...
12/09/2026

Thank you for visiting GIA at the Bangkok Gems and Jewelry Fair. See you again next year!

ขอบคุณที่มาเยี่ยมชมบูท GIA ของเรา แล้วพบกันใหม่ปีหน้านะคะ 🙏🏻

Your pearl goes through rigorous, multi-step testing when it is submitted to a GIA laboratory. Here’s a peek into how ou...
11/09/2026

Your pearl goes through rigorous, multi-step testing when it is submitted to a GIA laboratory. Here’s a peek into how our expertly trained gemologists conduct their analysis:

1. Item Description: Size, weight, shape, color and whether the pearl is loose, mounted or part of a strand are recorded.

2. Initial Testing:
- X-ray Radiography (RTX): Reveals internal structure to determine if a pearl is natural or cultured.
- UV Fluorescence: Detects treatments such as bleaching or optical brightening.

3. Advanced Analysis:
- EDXRF & XRF: Identify trace elements to help determine saltwater vs. freshwater origin.
- Raman & UV-Vis-NIR: Assess color origin and detect treatments, as well as support certain mollusk species calls.
- LA-ICP-MS: Provides detailed chemical data to support the identification of origin and pearl type in complex cases.

4. Pearl Classification (when applicable): Cultured pearls may be evaluated using the GIA 7 Pearl Value Factors™—size, shape, color, luster, surface, nacre and matching—to determine overall quality.

5. Report & Return: Your pearl is returned with its official GIA Pearl Identification Report, detailing whether it is natural or cultured, its growth environment, pearl type and any detected treatments. Cultured pearls submitted for the GIA Cultured Pearl Classification Report receive an evaluation based on the GIA 7 Pearl Value Factors™.

GIA pearl reports are powered by decades of research and advanced technology. Learn more about GIA’s pearl analysis process on our website: https://bit.ly/4eEjiX1

Did you know that approximately 30% of natural diamonds glow—or fluoresce—under UV light? 95% of these fluorescent diamo...
10/09/2026

Did you know that approximately 30% of natural diamonds glow—or fluoresce—under UV light? 95% of these fluorescent diamonds emit a classic blue glow, while rarer specimens can give off yellow, green or even red fluorescence.

Once viewed with caution, fluorescence is now appreciated as a natural characteristic of diamond formation. Research by GIA has shown that blue fluorescence can sometimes be a benefit; it can make certain diamonds with lower color grades appear more colorless and, in some cases, enhance a diamond’s brightness in daylight.

Very strong fluorescence, when paired with light-scattering inclusions, can rarely create a hazy “overblue” effect—famously seen in the Portuguese Diamond. In most diamonds, however, fluorescence is not noticeable under normal viewing conditions, remaining a subtle characteristic that only comes to life under UV light.

Do you have a diamond that fluoresces?

Learn more with our easy guide on our website: https://bit.ly/4fmO4VW

07/09/2026

Brazil is one of the most prolific gem-producing regions in the world. Deposits of high-quality emeralds, aquamarines and tourmaline can be found all over this lush landscape.

Which is your favorite stone produced in Brazil?

Join GIA’s Expert-Led Seminars at Bangkok Gems & Jewelry Fair! Discover the latest insights in pearl testing and diamond...
07/09/2026

Join GIA’s Expert-Led Seminars at Bangkok Gems & Jewelry Fair!

Discover the latest insights in pearl testing and diamond fluorescence, presented by GIA experts from New York and Carlsbad.

🔸 The Legacy of Pearl Testing at GIA
by Dr. Chunhui Zhou, Senior Manager, Research (Pearls), GIA New York

Explore the history of pearl testing, along with the latest developments in pearl testing and research. Discover how GIA continues to advance gemological knowledge through innovation, scientific research, and expertise.

🔸 The Impact of Fluorescence on Diamond Appearance
by Dr. Yun Luo, Director, Metrology and Quality Control, GIA Carlsbad

Fluorescence remains one of the most discussed—and often misunderstood—properties in diamond grading. While strong market opinions persist, the scientific and visual realities are more nuanced.
In this study, GIA researchers examine fluorescence through three lenses: history, research, and observable appearance. Drawing on advances in imaging and measurement technology, the team has quantitatively characterized the relationship between blue fluorescence intensity and its effects on table-down color, face-up color, brightness, and transparency under controlled illumination.

🔎 Join us to explore these fascinating topics and gain insights into GIA’s latest research and developments in gemological science.

Registration: https://shorturl.at/xr5Ke

🗓 Thursday, September 10 I 2:00-4:00 PM
📍 Room 110AB, QSNCC

ที่อยู่

GIA (International) Co. , Ltd. , Mitrtown Office Tower, 19th Floor, Unit 1901-1902, 944 Rama IV Road, Wangmai, Pathumwan
Bangkok
10330

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