The Guide to Diamonds
Explore the essentials of diamonds, from the 4Cs to shapes and care tips, with iDiamond Jewelry Shop—helping you choose brilliance with confidence.
Shape of Diamonds
round
princess
cushion
oval
pear
emerald
heart
radiant
asscher
marquise
The 4Cs of Diamonds
The quality and value of a diamond are determined by four key characteristics, commonly known as the 4Cs:
Cut
Cut is the most crucial factor influencing a diamond’s brilliance. It refers to how well the diamond is proportioned and how its facets interact with light. An expertly cut diamond will sparkle with unmatched brilliance and fire. Common cuts include Round, Princess, Cushion, Oval, Emerald, and more.
Color
Diamond color is graded from D (colorless) to Z (light yellow or brown). Colorless diamonds are rare and highly prized. Subtle differences in color can significantly affect a diamond's value and appearance.
Clarity
Clarity measures the presence of internal or external imperfections, known as inclusions and blemishes. Diamonds are graded from Flawless (FL) to Included (I). The fewer the inclusions, the more valuable and brilliant the diamond.
Carat
Carat refers to the weight of the diamond. One carat is equivalent to 0.2 grams. Larger diamonds are rarer and, therefore, more valuable. However, carat weight alone does not determine a diamond's beauty—it is best assessed alongside the other Cs.
Certified Diamonds
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GIA, IGI or HRD reports provided where applicable — endorsed by the
world's most respected gemological authorities.
Explore More
Looking for more diamond guides, buying tips or details about the 4Cs? Explore more of our diamond education pages:
FAQs About The 4Cs of Diamonds
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