gemstone identification

Gemologist using a refractometer to measure the refractive index of a gemstone placed table-down with contact liquid.

Refractometer in Gemology: A Simple Guide to R.I. Measurement

Gem Testing Instruments /

Summary A refractometer measures a gemstone’s refractive index using total internal reflection. It’s a quick, non-destructive, and accurate test in gemology. You’ll need a clean surface, contact liquid, and proper setup for reliable results. Flat surfaces reveal optic properties; curved surfaces provide mean R.I. values. Introduction A refractometer is one of the most important tools […]

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The Black Prince’s “Ruby,” a large red spinel set in the British Imperial State Crown, mistaken historically for a ruby.

Red Spinel vs Ruby: Avoid Misidentification

Gemology, Gemstones, Jewellery /

Summary Red Spinel is often misidentified as ruby, a mistake that costs money and credibility. Learn how to distinguish them using simple tools and why honesty protects your reputation. Introduction For collectors and sellers, understanding red spinel vs ruby is crucial. Many people have mistakenly sold red spinels as rubies, including the famous Black Prince’s

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Comparison of natural, synthetic, and imitation gemstones showing different origins and appearances.

Natural, Synthetic, or Imitation Gemstones: Know Before You Buy

Gemstone Buying, Gemstone Buying Guides, Gemstone Classifications /

SummaryThis guide explains the differences between natural, synthetic, and imitation gemstones. Learn how each is formed, their value, and why asking the key question before buying protects your wallet. Discover practical tips, certification advice, and how to make informed gemstone purchases. What Are Natural, Synthetic, and Imitation Gemstones? Every gemstone sparkles, but do you know

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