Natural Sapphire & Gemstone Buying Guides

How to Spot a Fake Sapphire — Glass, Synthetics, Doublets

偽物のサファイアの見分け方｜ガラス・合成石・ダブレットと注意点

偽物のサファイアの見分け方を、ガラス、合成石、ダブレット、ベリリウム拡散処理、誤表示された鉱物種まで含めて解説。自分でできる確認方法、専門機関による検査が必要な場合、購入時の注意点をご紹介します。

もっと読む偽物のサファイアの見分け方｜ガラス・合成石・ダブレットと注意点について

Three-Stone Sapphire Rings — How to Choose the Center Stone, Side Stones

Three-Stone Sapphire Rings — How to Choose the Center Stone, Side Stones, and Get the Proportions Right

How to design a three-stone sapphire ring: choosing the center stone by color, size, shape, and treatment, selecting diamond or sapphire side stones, getting the proportions and metal right, and the common mistakes to avoid.

もっと読むThree-Stone Sapphire Rings — How to Choose the Center Stone, Side Stones, and Get the Proportions Rightについて

Trending Sapphire Colors for 2026 — What's Hot, What's Rising, and Where the Value Is

Trending Sapphire Colors for 2026 — What’s Hot, What’s Rising, and Where the Value Is

The sapphire colors trending in 2026, from breakout teal and romantic peach to classic vivid blue, bold pink, underrated yellow, and collector-grade padparadscha — with pricing ranges and buying guidance for each.

もっと読むTrending Sapphire Colors for 2026 — What’s Hot, What’s Rising, and Where the Value Isについて

Kashmir Sapphire

Kashmir Sapphire — Mining, Availability, Premium Pricing, and the Investment Case

Kashmir sapphire's history and investment case: the 1881 discovery, why mining stopped, what makes its velvety cornflower-blue color unique, current availability and pricing, and an honest comparison against Ceylon origin.

もっと読むKashmir Sapphire — Mining, Availability, Premium Pricing, and the Investment Caseについて

Madagascar Sapphire Mining

Madagascar Sapphire Mining — Ilakaka, the South Asian Connection, and How Stones Reach the Market

How Madagascar's sapphire deposits are mined and reach the market: the Ilakaka rush that changed the trade, the mining methods used, the Sri Lankan and Thai buyers who shaped the supply chain, and how rough travels from mine to cutting center.

もっと読むMadagascar Sapphire Mining — Ilakaka, the South Asian Connection, and How Stones Reach the Marketについて

Mining for Sapphires in Montana — America's Gem State and What It Produces

Mining for Sapphires in Montana — America's Gem State and What It Produces

How sapphires are mined in Montana, America's gem state: the three main deposits — Rock Creek, Dry Cottonwood Creek, and the Missouri River — plus the legendary Yogo Gulch, the mining methods used, and what it means for buyers.

もっと読むMining for Sapphires in Montana — America's Gem State and What It Producesについて

Spinel — The Collector's Guide to the World's Most Undervalued Gemstone

Spinel — The Collector's Guide to the World's Most Undervalued Gemstone

The complete buyer's guide to spinel, one of the most undervalued fine gemstones: why it is almost never treated, its color range from red and cobalt blue to lavender, where it is mined, and how it compares to sapphire and ruby.

もっと読むSpinel — The Collector's Guide to the World's Most Undervalued Gemstoneについて

Tsavorite mines

ケニアとタンザニアのツァボライト採掘｜世界屈指のグリーンガーネットが採れるまで

ケニアとタンザニアでのツァボライト採掘を解説。キャンベル・ブリッジズによる発見、主要鉱床、地下採掘の方法、そしてこの鮮やかなグリーンの宝石が希少であり続ける理由をご紹介します。

もっと読むケニアとタンザニアのツァボライト採掘｜世界屈指のグリーンガーネットが採れるまでについて

Rathnapura Gem market

The Ratnapura Gem Market — How Sapphires Are Traded at the Source

Inside the Ratnapura gem market, where Sri Lankan sapphires are traded at the source: how a trading session works, what moves through the market from rough to finished stones, and how the supply chain reaches your ring.

もっと読むThe Ratnapura Gem Market — How Sapphires Are Traded at the Sourceについて

Madagascar Sapphire — The Modern Origin That Rivals Ceylon

マダガスカル産サファイアとは｜セイロンとの違い・産地の記載・選び方

マダガスカルは1990年代後半から世界有数のサファイア産地になりました。ブルー、ピンク、カラーチェンジまで幅が広く、最上質の石はセイロンと本当に競合します。このページでは、鉱区ごとの地質と色、セイロンとの比較、日本の鑑別書に産地が載らない理由と分析報告書という別の書類、そして買うときに確かめることを扱います。

もっと読むマダガスカル産サファイアとは｜セイロンとの違い・産地の記載・選び方について

Montana Sapphire vs. Ceylon Sapphire — How America's Sapphire Compares to Sri Lanka's

Montana Sapphire vs. Ceylon Sapphire — How America's Sapphire Compares to Sri Lanka's

Montana sapphire vs. Ceylon sapphire: how the two origins differ in size, color palette, treatment, price, and traceability — and which one fits your priorities for an engagement ring or collection piece.

もっと読むMontana Sapphire vs. Ceylon Sapphire — How America's Sapphire Compares to Sri Lanka'sについて

Sapphire vs. Spinel — The Overlooked Comparison Every Collector Should Understand

Sapphire vs. Spinel — The Overlooked Comparison Every Collector Should Understand

Sapphire vs. spinel: how the two gemstones compare on color range, hardness, treatment status, clarity, price, and market recognition — and which one suits a collector versus an everyday engagement ring buyer.

もっと読むSapphire vs. Spinel — The Overlooked Comparison Every Collector Should Understandについて

Why Buy from Crescent Gems


Choosing a gemstone for an engagement ring or important piece of jewellery is a deeply personal decision. It is often a meaningful purchase made only a few times in a lifetime, so trust, accurate information and expert guidance matter. Crescent Gems combines more than 25 years of gemstone experience with direct sourcing, careful cutting and transparent treatment disclosure to help you choose with confidence

Natural, earth-mined gemstones only

Direct sourcing from leading mining regions

No synthetic, flux-filled or beryllium-diffused stones

In-house cutting and recutting

FREE Shipping within USA and Low rates for international orders.

Actual photographs, hand videos and 360-degree views

14-day returns

Free US return shipping

GIA reports for significant gemstones

Try Before You Buy

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