Information pages : The complete guide

What Is an Unheated Sapphire? Everything Buyers Need to Know

What Is an Unheated Sapphire? The Complete Buyer's Guide

Unheated sapphires explained: what the term means, why 90–95% of sapphires are heated, how labs verify untreated status, which colors are most often unheated, what premium to expect, and whether it is worth paying.

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How to Choose a Sapphire for Your Engagement Ring

How to Choose a Sapphire for Your Engagement Ring

A practical, honest guide to choosing the right sapphire for your engagement ring — covering color, cut, clarity, heat treatment, origins, setting metals, and budget, written by gem dealers who source sapphires directly in Sri Lanka.

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Ceylon Sapphire Engagement Rings: How to Choose the Right Stone, Directly from the Source

Ceylon Sapphire Engagement Rings: How to Choose the Right Stone, Directly from the Source

A practical guide to choosing a Ceylon sapphire for your engagement ring — written by people who source them directly in Sri Lanka. Covers color, cut, treatment, documentation, budget, and the questions most buyers never think to ask until it is too late.

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How to Tell If a Star Sapphire Is Natural: A Complete Identification Guide

How to Tell If a Star Sapphire Is Natural: A Complete Identification Guide

How to tell if a star sapphire is natural: what genuine asterism looks like, the inclusions that produce it, how to identify a synthetic Linde star, glass imitations, and diffusion-treated material — plus the tests and reports that confirm authenticity.

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Purple Sapphire — The Complete Buyer's Guide

Purple Sapphire — The Complete Buyer's Guide to Color, Origin, and Value

Purple sapphire is one of the most undervalued stones in the sapphire family — a color-shifting, vanadium-colored corundum that moves from blue-violet in daylight to reddish-purple under warm light. This guide covers the full color spectrum from lavender to plum, the purple vs. violet distinction, why fine purple is almost always unheated, origin differences, pricing, skin tone and metal pairing, engagement ring cuts, and how it compares to amethyst and tanzanite.

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Peach Sapphire — The Complete Buyer's Guide to Color, Origin, and Value

Peach Sapphire — The Complete Buyer's Guide to Color, Origin, and Value

Peach sapphire is natural corundum in a warm salmon-pink color — one of the most flattering and undervalued gemstone colors available. This guide covers what creates the peach color, the padparadscha boundary, origin differences, why fine peach is almost always unheated, pricing, skin tone and metal pairing, the best engagement ring cuts, and how it compares to morganite and padparadscha.

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Pink Sapphire — The Complete Buyer's Guide to Color, Origin, and Value

Pink Sapphire — The Complete Buyer's Guide to Color, Origin, and Value

Pink sapphire is natural corundum coloured by chromium — the same element responsible for ruby. This complete guide covers the full colour spectrum, the pink-sapphire-to-ruby boundary, origin differences, heat treatment, pricing, skin tone and metal pairing, engagement ring guidance, and how pink sapphire compares to pink diamond and morganite.

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Blue Sapphire — The Complete Buyer’s Guide

Blue Sapphire — The Complete Buyer’s Guide to Color, Origin, and Value

Blue sapphire is the most commercially significant colored gemstone in the world — prized for over 2,500 years, the benchmark against which every other colored stone is measured, and the most consistently appreciating investment-grade gemstone category when unheated and GIA-certified. This guide covers the iron-titanium color mechanism, hue-tone-saturation grading, the five key origins (Kashmir, Burma, Ceylon, Madagascar, Thailand), heat treatment and the unheated premium, how to read a GIA report for blue sapphire, Jyotish Neelam specifications, a complete pricing framework from $150 to $200,000+ per carat, blue sapphire vs. tanzanite and aquamarine, engagement ring cuts and settings, metal pairing, and a four-scenario certification guide.

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Yellow Sapphire — The Complete Buyer’s Guide to Colour, Origin, and Value

Yellow Sapphire — The Complete Buyer’s Guide to Colour, Origin, and Value

Yellow sapphire is the most commercially significant non-blue sapphire in the world — spanning pale straw through vivid canary to deep orange-gold. This guide covers the full colour spectrum, origin differences, heat treatment, Jyotish requirements, certification, pricing, and how to compare yellow sapphire against yellow diamond and citrine.

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Padparadscha Sapphire — The World's Rarest Sapphire Colour Explained

Padparadscha Sapphire — The World's Rarest Sapphire Colour Explained

Padparadscha sapphire is the rarest colour variety in the natural corundum family — a precise salmon-pink to orange-pink tone certified only by major gemological laboratories. This guide covers what defines a true padparadscha, how it is graded, where it comes from, what it costs, and how to buy one safely.

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The best sapphire cut for engagement rings, explained

The Best Sapphire Cut for an Engagement Ring — Shape, Brilliance, and What to Choose

How to choose the best sapphire cut for an engagement ring: how each shape affects brilliance, color, and face-up size, which cuts elongate the finger, which suit which settings, and the key trade-offs between oval, cushion, round, emerald, and pear.

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Can You Buy Rare-Color Sapphires Online?

Can You Buy Rare-Color Sapphires Online? What's Actually Available, What It Costs, and How to Verify What You're Getting

Which rare sapphire colors — padparadscha, teal, violet, star, color-change, and fine unheated blue — are actually available online, what they cost, and how to verify color, origin, and treatment before committing to a purchase.

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Why Buy from Crescent Gems

Sourcing Gemstones for an engagement ring or piece of jewelry is a very personal experience, Its a act of love, Its a Investment that you do only a few times in your life. Before you spend thousands of $$$ You need to be able to trust the seller and make sure you are choosing the right stone. Here at Crescent gems we tick all the boxes.

Wide Selection of well cut gemstones from around the world.

Affordably priced ~ We source our gemstones direct from mining countries, we cut/recut most of our gemstones in-house.

We stock and sell ONLY Natural earth Mined stones. NO beryllium treated Stones, NO Flux filled, NO synthetics, NO man made stuff.

Free & Fast Shipping within USA ( FedEx Or UPS) with Tracking and email updates.

FREE International shipping for orders over US $ 500 ~ we ship to 98 countries Worldwide.

Try Before you buy Option ~ where we send the stone to you before you pay. ~ Unique Feature.

14 day No questions asked money back Guarantee.

FREE Domestic Return Shipping.

GIA lab reports for all significant stones.

Accurate information, Actual Images, Hand shots and 360 videos of the stone on sale, we don't use stock photography.

Join our ever growing group of satisfied customers from around the world.