Exhibitors

<ul>
	<li>Topaz is one of the most popular and widespread jewelry stones, it is beautiful and has many colors and shades. However natural topaz is almost always colorless or has a light blue shade. Modern technologies allow obtaining yellow, brown, orange, light and dark blue colors of topaz when the stone is irradiated with neutrons and (or) electrons and gamma radiation. Interestingly, all-natural colored raw topaz stones are a product of natural radiation. The main color centers in topaz are always radiation defects. Only pink topaz is an exception because it is colored pink by radiation color centers, which contain chromium or manganese atoms.</li>
	<li>Thus all topaz on the market is the product of radiation exposure either in the laboratory or nature. 99% of the stones are technically processed in the laboratory to get their color. Blue topaz is the most popular and is in great demand in many countries.</li>
</ul>


<ul>
	<li>Chemical composition: Be3Al2Si6O18</li>
	<li>Color: light green</li>
	<li>Symmetry: Hexagonal</li>
	<li>Hardness (Mohs scale): 7.5-8.0</li>
	<li>Density: 2.67-2.75</li>
	<li>Refractive index: 1.578 - 1.572</li>
	<li>Dispersion (C-F): 0.014</li>
	<li>Heat resistance: up to 1250°C/ 2282°F</li>
</ul>


<ul>
	<li>Chemical composition: Be3Al2Si6O18</li>
	<li>Symmetry: Hexagonal</li>
	<li>Hardness (Mohs scale): 7.5-8.0</li>
	<li>Density: 2.67-2.75</li>
	<li>Refractive index: 1.578 - 1.572</li>
	<li>Dispersion (C-F): 0.014</li>
	<li>Heat resistance: up to 1250°C/ 2282°F</li>
</ul>


<ul>
	<li>Synthetic Beryllium Alum silicate</li>
	<li>Chemical composition: Be3, Al2, Si6, O18</li>
	<li>Minor chemical elements (wt./%): MnO 0.15-0.26, FeO 1.52-1.89</li>
	<li>Crystal system: hexagonal</li>
	<li>Space group: P6/mcc Density (g/cm3): 2.72-2.73</li>
	<li>Cleavage: absent Mohs hardness: 8</li>
	<li>Fracture: uneven to conchoidal</li>
	<li>Brittleness: brittle Index of refraction: No- 1.570, Ne- 1.565</li>
	<li>Optical character: uniaxial, negative Birefringence: 0.005</li>
	<li>Growth method: hydrothermal process</li>
</ul>


<ul>
	<li>Chemical Composition: Be3Al2Si6O18</li>
	<li>Symmetry: Hexagonal</li>
	<li>Hardness (Mohs Scale): 7.5-8.0</li>
	<li>Density: 2.67-2.75</li>
	<li>Refractive Index: 1.578 - 1.572</li>
	<li>Dispersion (C-F): 0.014</li>
	<li>Heat Resistance: Up to 1250°C/2282°F</li>
	<li>Growth Method: Hydrothermal process</li>
</ul>


<ul>
	<li>Chemical Composition: Al2SiO4(F, OH)2</li>
	<li>Symmetry: Irregular</li>
	<li>Hardness (Mohs Scale): 8.0</li>
	<li>Density: 3.4-3.6</li>
	<li>Refractive Index: 1.616 - 1.638</li>
	<li>Dispersion (R-V): Noticeable</li>
	<li>Heat Resistance: Up to 649°C/1200°F</li>
	<li>Treatment Method: Irradiation</li>
</ul>


<ul>
	<li>Chemical composition: Be3Al2Si6O18</li>
	<li>Symmetry: Hexagonal</li>
	<li>Hardness (Mohs Scale): 7.5-8.0</li>
	<li>Density: 2.67-2.75</li>
	<li>Refractive Index: 1.578 - 1.572</li>
	<li>Dispersion (C-F): 0.014</li>
	<li>Heat resistance: Up to 1250°C/2282°F</li>
	<li>Growth Method: Hydrothermal process</li>
</ul>


<ul>
	<li>Chemical Classification: silicate</li>
	<li>Luster: vitreous</li>
	<li>Diaphaneity: translucent to transparent</li>
	<li>Cleavage: perfect basal cleavage</li>
	<li>Mohs Hardness: 8</li>
	<li>Specific Gravity: 3.4-3.6</li>
	<li>Chemical Composition: Al2SiO4 (F,OH)2</li>
	<li>Crystal System: orthorhombic</li>
</ul>


<ul>
	<li>Chemical composition: Be3Al2Si6O18&nbsp;</li>
	<li>Symmetry: hexagonal&nbsp;</li>
	<li>Hardness (Mohs scale): 7.5-8.0&nbsp;</li>
	<li>Density: 2.67-2.75&nbsp;</li>
	<li>Refractive index: 1.578 - 1.572&nbsp;</li>
	<li>Dispersion (C-F): 0.014&nbsp;</li>
	<li>Heat resistance: up to 1250°C/2282°F</li>
</ul>


<ul>
	<li>Synthetic Beryllium Alum silicate Chemical composition: Be3, Al2, Si6, O18</li>
	<li>Minor chemical elements (wt./%): MnO 0.15-0.26, FeO 1.52-1.89</li>
	<li>Crystal system: hexagonal</li>
	<li>Space group: P6/mcc</li>
	<li>Density (g/cm3): 2.72-2.73</li>
	<li>Cleavage: absent</li>
	<li>Mohs hardness: 8</li>
	<li>Fracture: uneven to conchoidal</li>
	<li>Brittleness: brittle Index of refraction: No- 1.570, Ne- 1.565</li>
	<li>Optical character: uniaxial, negative</li>
	<li>Birefringence: 0.005</li>
	<li>Growth method: hydrothermal process</li>
</ul>


<ul>
	<li>Chemical composition: Be3Al2Si6O18&nbsp;</li>
	<li>Symmetry: hexagonal&nbsp;</li>
	<li>Hardness (Mohs scale): 7.5-8.0&nbsp;</li>
	<li>Density: 2.67-2.75&nbsp;</li>
	<li>Refractive index: 1.578 - 1.572&nbsp;</li>
	<li>Dispersion (C-F): 0.014&nbsp;</li>
	<li>Heat resistance: up to 1250°C/2282°F&nbsp;</li>
	<li>Growth method: hydrothermal process</li>
</ul>


<ul>
	<li>Swiss, London, Sky blue topaz</li>
</ul>


Chemical composition: Be3Al2Si6O18 Symmetry: Hexagonal Hardness (Mohs scale): 7.5-8.0 Density: 2.67-2.75 Refractive index: 1.578 - 1.572 Dispersion (C-F): 0.014 Heat resistance: up to 1250°C/2282°F

<ul>
	<li>Chemical composition: Be3Al2Si6O18 Symmetry: Hexagonal Hardness (Mohs scale): 7.5-8.0 Density: 2.67-2.75 Refractive index: 1.578 - 1.572 Dispersion (C-F): 0.014 Heat resistance: up to 1250°C/2282°F</li>
</ul>


Fair at a Glance

Exhibitor List

Product List

Hall Plan

Success Stories

Fair Catalogue 2026

Important Notices

Fair

Apply Booth

Participation Fee & Format

eBrochure

Advertising Opportunities

SME Export Marketing Fund

Resources Centre

Exhibit

eNews

HKTDC Marketplace App & e-Badge

hktdc.com Sourcing

Visitor's Rules and Regulations

Caution on Third Party Promotional Offers

E+ Premier Club

Visit

Press Releases

Photo Gallery

Video Gallery

Social Media / Digital News

Media Centre

Press

Events

Visa/Permit for Entering Hong Kong

Visa Application & Travel Arrangements to Chinese Mainland

Hotel Offerings

Airfare Offerings

Dining Offers

Dedicated Immigration Counter

Customs Requirements on Cross-border Cash Controls

Travel to Fairground

Explore Hong Kong

Information for Muslim Visitors

Extreme Weather Arrangement

Travel Info

Enquiries

HKTDC Events

Homepage

Success Stories 2021

Caution on Third Party Promotional Offers from Fair Expo / Fair Guide/Expo Guide/Event Fair

Caution on Rental of Credit Card Payment Terminals

Special Airfares From Cathay Pacific

Important Exhibition Regulations

Immigration and Regulations to be Observed and Followed by Exhibitors

01/21 Indian citizens Pre-Arrival registration arrangement

Additional Facilities & Services Order Form

Fast Track Immigration for Fair Participants

Shuttle Bus

Hygiene Measures & Health Tips

02/21 Issuance of invoice follow the rule of Trade Ordinance

Green Tips

Exhibitor's Manual

Special Circular – Trade Description Ordinance

Visitor Pre-registration

Save Registration Time and Receive a Free Gift

Circular

Visitor’s Rules and Regulations

Fair Spotlights

Contact Us

Social Media / Digital News - 2021

Social Media / Digital News - 2018

Social Media / Digital News - 2017

Social Media / Digital News - 2016

Social Media / Digital News - 2019

Supporting Media

Intelligence Hub

Shopping Coupons

Success Stories 2022

Social Media / Digital News - 2022

Social Media / Digital News - 2023

Online Registration And Verification

ONLINE REGISTRATION AND VERIFICATION

Airfare offerings

1st Important Circular

Click2Match Simple Guide

2nd Important Circular

Social Media / Digital News - 2024

Social Media / Digital News - 2025