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4Cs Education
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4Cs Education
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Simulants, Moissanite and Lab-Grown Diamonds
GIA Grading & Reports
Grading the 4Cs
GIA Diamond Grading
Types of GIA Reports
About GIA
4Cs Blog
4Cs Education
Why the 4Cs?
Diamond Color
Diamond Clarity
Diamond Cut
Diamond Carat Weight
Diamond Buying Guide
How to Buy A Diamond
Diamond Treatments
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Simulants, Moissanite and Lab-Grown Diamonds
GIA Grading & Reports
Grading the 4Cs
GIA Diamond Grading
Types of GIA Reports
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Old Mine Cut Diamond Guide
September 3, 2025
Learn about the Old Mine Cut Diamond, a vintage style known for its soft, squarish shape and designed to sparkle in candlelight.
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Rubies vs. Diamonds: What Are the Similarities and Differences?
August 27, 2025
Rubies and diamonds are among the world’s most treasured gemstones. Learn about which similarities and differences you should know before a purchase.
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