PJ Joseph

Welcome! I’m P.J. Joseph—a trained gemologist with over 40 years of experience in the fascinating world of gemstones. My journey blends scientific precision with storytelling, as I’ve spent decades educating others through writing. Whether you're a curious beginner or a seasoned collector, I’m here to share insights that empower ethical, informed choices in jewelry and gemology. I hold a professional diploma (DgemG) in gemology from the Deutsche Gemmologische Gesellschaft e.V., Idar-Oberstein, Germany, and the Gemological Institute of India, Mumbai, India.

A 10x triplet loupe held close to the eye, used to examine the internal features of a cut gemstone.

How to Use a Loupe for Gemstone Examination

Summary A simple, practical guide to using a 10x triplet loupe for gemstone examination. Learn how to choose and test a quality loupe, avoid distortion, and use correct hand technique. If you’re expanding your gemological skills, explore related topics like Gemstone Types Explained and Understanding the Gemological Microscope for deeper insight into gem testing 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

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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MING 57.04 Iris: 8th Anniversary Destro Chronograph

MING 57.04 Iris: 8th Anniversary Destro Chronograph

SummaryCelebrate MING’s 8th anniversary with the 57.04 Iris, a 40mm destro monopusher chronograph featuring Art Deco-inspired stepped lugs and a shifting turquoise-to-purple dial. A milestone in MING’s fifth-generation design, it combines precision engineering with bold aesthetics. August 2025 marks MING’s 8th anniversary. Over the years, the brand has produced: The MING 57.04 Iris defines the

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Understanding the Gemological Microscope: A Closer Look

Understanding the Gemological Microscope: A Closer Look

SummaryDiscover how a gemological microscope works and why it is essential for gemstone analysis. Learn about objective and ocular lenses, magnification calculations, and how to spot inclusions, cuts, and surface features. Perfect for beginners and gem enthusiasts. Introduction to the Gemological Microscope A gemological microscope is one of the most important tools for studying gemstones.

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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

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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Close-up of a gemstone certificate from a reputable gemological lab showing detailed analysis and authenticity marks.

Gemstone Certificates: When They Help and When They Don’t

SummaryLearn how gemstone certificates from GIA, AGL, IGI, GII, SSEF, and Gübelin can guide your purchase. Discover when they add value, when they don’t, and how to choose wisely. What a Gemstone Certificate Tells You A certificate from reputable labs like GIA or AGL confirms whether a gem is natural, synthetic, or imitation. It lists

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