Education
AGS
AGS Reports
American Gem Society reports appear when supplied by inventory.
Appraisal
Appraisal
Appraisals are prepared on request and are not the same as an online listing price.
Carat
Carat Weight
Carat measures weight, not visible size alone.
Clarity
Clarity Grades
Clarity describes inclusions and blemishes under 10x magnification.
Color
Color Grades
Colorless, near-colorless, and fancy color are different scales.
Cut
Cut Quality
Cut describes how a diamond is faceted, not its shape.
Proportions
Depth, Table, Crown, Pavilion
Proportion fields help experienced buyers compare cutting style.
Anatomy
Diamond Anatomy
Crown, girdle, pavilion, and culet are the basic parts of a faceted diamond.
Buying
Diamond Buying Guide
Start with use, budget range, shape, and whether you want to view in New York.
Certification
Diamond Certification
A laboratory report is an independent description, not a YDR guarantee of future value.
Shapes
Diamond Shapes
Shape is the outline of the stone — round, oval, cushion, and others.
Engagement
Engagement Ring Guide
Start with a diamond, a setting, or a conversation with YDR.
Fluorescence
Fluorescence
Fluorescence is a reaction to UV light, recorded on many reports.
GIA
GIA Reports
The Gemological Institute of America issues widely used diamond reports.
Pricing
How YDR Shows Diamond Prices
Trade and reference figures are internal. Customers see approved retail or Request Price.
IGI
IGI Reports
The International Gemological Institute issues reports for natural and laboratory-grown diamonds.
Inclusions
Inclusions and Comments
Plot comments and key-to-symbols text are copied from the report feed when present.
Insurance
Insurance
Insurance is arranged between you and your insurer. YDR can discuss documentation.
Care
Jewelry Care
General care notes. Specific metal and stone advice should be confirmed with YDR.
Measurements
Measurements and Ratio
Length, width, and depth describe the stone in millimeters.
Origin
Natural and Laboratory-Grown Diamonds
Origin is a factual field. We do not argue one is universally better.
Resale
Resale
Secondary-market outcomes vary. YDR does not guarantee resale value.
4Cs
The 4Cs of Diamonds
Carat, cut, color, and clarity — the language YDR uses to describe a diamond.
Upgrade
Upgrade Conversations
Upgrade or trade-in terms are not published as a standing offer.