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Sapphire

Sapphire

Origins, properties, grading & value

Estimate Value

Quick Facts

FamilyCorundum
Chemical CompositionAl₂O₃ + Fe, Ti, Cr
Mohs Hardness9
Refractive Index1.76–1.77
Birefringence0.008–0.010
Common Cuts Oval, Cushion, Round, Emerald
Typical Colors Blue, Pink, Yellow, Green, Colorless (White Sapphire)
Notable Origins Sri Lanka, Kashmir, Madagascar, Thailand, Australia

Grading & Buyer’s Guide

Sapphires are graded primarily by color intensity, tone, and clarity.
The most valued blue sapphires display a vivid, velvety blue hue with medium tone.
“Cornflower Blue” Kashmir sapphires are among the rarest and most prized.
Clarity plays a smaller role than color; slight inclusions are acceptable if color is exceptional.

Care & Cleaning

Clean sapphires with warm soapy water and a soft brush.
Avoid harsh chemicals and thermal shock.
Ultrasonic cleaners are generally safe for untreated sapphires, but not for fracture-filled or diffused stones.

FAQs

Q: Are sapphires always blue?
No — sapphires occur in nearly every color except red (which is classified as ruby).

Q: What does “Padparadscha” mean?
It refers to a rare pinkish-orange sapphire color, named after the lotus flower.

Gemstone Value Estimator

Educational price estimate based on gem type, weight, and quality attributes.
Diamond grading terms follow GIA 4Cs. Results are indicative only and not a formal appraisal.

1) Stone Basics

2) Diamond Quality (GIA)

2) Colored Gem Quality

3) Certification & Currency

Advanced (Exchange Rates)

Disclaimer: This calculator provides an indicative estimate for educational purposes and does not constitute an appraisal. For formal valuations, consult a certified gemologist/appraiser. Diamond terminology references GIA’s 4Cs.