4cs.gia.edu

• charset: UTF-8
• name: viewport content: width=device-width, initial-scale=1.0, viewport-fit=cover
• name: robots content: index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
• property: og:locale content: en_US
• property: og:locale:alternate content: zh_CN
• property: og:locale:alternate content: zh_HK
• property: og:locale:alternate content: ja_JP
• property: og:type content: website
• property: og:title content: Home
• property: og:description content: The 4Cs of diamond quality. For nearly 100 years, we’ve provided consistent and unbiased expertise in the diamond industry. As the home of the 4Cs, we are dedicated to educating the industry and most importantly, protecting consumers. Learn how the 4Cs can help you make your next purchase.Learn More The 4Cs of diamond quality. For […]
• property: og:url content: https://4cs.gia.edu/en-us/
• property: og:site_name content: GIA 4Cs
• property: article:modified_time content: 2025-08-06T18:33:11+00:00
• property: og:image content: https://4cs.gia.edu/wp-content/uploads/2024/07/02_50-50-Module_960x800-8.jpg
• property: og:image:width content: 960
• property: og:image:height content: 800
• property: og:image:type content: image/jpeg
• name: generator content: WordPress 6.8.3
• name: generator content: Elementor 3.33.4; features: e_font_icon_svg, additional_custom_breakpoints; settings: css_print_method-internal, google_font-disabled, font_display-swap
• name: apple-itunes-app content: app-id=1623642988
• name: generator content: Powered by Slider Revolution 6.6.14 - responsive, Mobile-Friendly Slider Plugin for WordPress with comfortable drag and drop interface.
• name: msapplication-TileImage content: https://4cs.gia.edu/wp-content/uploads/2016/07/cropped-favicon-300x300.png

• https://4cs.gia.edu/en-us/
• http://4cs.gia.edu/#
• https://4cs.gia.edu/en-us/4cs-of-diamond-quality/
• https://4cs.gia.edu/en-us/diamond-color/
• https://4cs.gia.edu/en-us/diamond-clarity/
• https://4cs.gia.edu/en-us/diamond-cut/
• https://4cs.gia.edu/en-us/diamond-carat-weight/
• How to Buy A Diamond
• Diamond Treatments
• Diamond Origin
• Simulants, Moissanite and Lab-Grown Diamonds
• Grading the 4Cs
• https://4cs.gia.edu/en-us/how-gia-grades-diamonds/
• Types of GIA Reports
• About GIA
• https://4cs.gia.edu/en-us/blog/
• https://4cs.gia.edu/en-us/blog/vvs-diamond-versus-vs-diamond/
• https://4cs.gia.edu/en-us/blog/diamond-fluorescence-good-bad/
• https://4cs.gia.edu/en-us/blog/tips-for-buying-an-engagement-ring/
• Read More
• https://4cs.gia.edu/en-us/blog/vvs-diamond-versus-vs-diamond/#more-13308
• Read More
• Read More
• Read More
• https://4cs.gia.edu/zh-cn/
• https://4cs.gia.edu/zh-hk/
• https://4cs.gia.edu/ja-jp/

• https://onelink.to/p9cacu
• Retailer Lookup
• GIA Report Check
• GIA Gem Encyclopedia
• GIA Laboratory Services
• GIA Education
• Are you a retailer?
• GIA.edu
• Terms of Use
• Copyrights and Trademarks
• Privacy Notice
• Contact Us
• English
• 簡体中文
• 日本語

            This Registry database contains ONLY .EDU domains.
The data in the EDUCAUSE Whois database is provided
by EDUCAUSE for information purposes in order to
assist in the process of obtaining information about
or related to .edu domain registration records.
The EDUCAUSE Whois database is authoritative for the
.EDU domain.
A Web interface for the .EDU EDUCAUSE Whois Server is
available at: http://whois.educause.edu
By submitting a Whois query, you agree that this information
will not be used to allow, enable, or otherwise support
the transmission of unsolicited commercial advertising or
solicitations via e-mail.  The use of electronic processes to
harvest information from this server is generally prohibited
except as reasonably necessary to register or modify .edu
domain names.
-------------------------------------------------------------
Domain Name: GIA.EDU
Registrant:
Gemological Institute of America
5345 Armada Drive
Carlsbad, CA 92008
USA
Administrative Contact:
admin Admin
Gemological Institute of America
5345 Armada Drive
Carlsbad, CA 92008
USA
+1.7606034313
[email protected]
Technical Contact:
admin 
Gemological Institute of America
5345 Armada Drive
Carlsbad, CA 92008
USA
+1.7606034313
[email protected]
Name Servers:
A1-7.AKAM.NET
A3-65.AKAM.NET
A11-67.AKAM.NET
A10-66.AKAM.NET
A24-64.AKAM.NET
A6-66.AKAM.NET
Domain record activated:    30-Mar-1996
Domain record last updated: 28-May-2025
Domain expires:             31-Jul-2027
        

Тецхницал СЕО

СЕО на страници

Садржај и кориснички доживљај