Tag

certification

12 articles

Buying Guides·July 21, 2026·9 min read

Gem Collections: How to Build One That Lasts

A working guide to building a colored gemstone collection with staying power, from balancing color and origin to why documentation compounds and unheated Ceylon material anchors the whole thing.

Specialty Stones·July 19, 2026·5 min read

Royal Blue Sapphire: Ceylon's Deepest Blue Grade

Royal blue is the deep, saturated end of the Ceylon blue spectrum. This guide defines the grade, explains the tone and saturation that drive its premium, and shows how Crestonne separates true royal blue from over-dark stones.

Understanding·July 19, 2026·7 min read

Sapphire and Ruby: The Two Faces of Corundum

Sapphire and ruby are one mineral wearing two colours. Here is how a trace of chromium turns corundum red, and where the line between pink sapphire and ruby actually sits.

Ethics & Sourcing·July 11, 2026·8 min read

Ceylonese Sapphire: Why Sri Lanka's Stones Stand Apart

Sri Lanka has produced the world's benchmark sapphires for over two millennia. This is why origin still matters, and what actually separates a Ceylonese stone from the rest.

Understanding·July 6, 2026·7 min read

Natural Blue Sapphire vs Imitations & Treatments

A dealer's checklist for separating a genuine natural blue sapphire from synthetics, diffusion-treated stones, and glass-filled composites, and knowing what "natural" should actually guarantee at your price point.

Buying Guides·July 5, 2026·7 min read

Blue Sapphire Price: What Drives the Cost (2026)

What a blue sapphire actually costs comes down to five factors that compound each other. This is a realistic breakdown of the ranges and the reasons behind them.

Buying Guides·July 4, 2026·8 min read

Buying a Blue Sapphire Gemstone: What to Look For

A practical, spec-first guide to buying a natural blue sapphire: the five things that actually move the price, and how to read them before you commit.

Understanding·July 4, 2026·9 min read

Blue Sapphire: The Complete Ceylon Guide (2026)

Blue sapphire is corundum coloured by trace iron and titanium, and Ceylon origin defines the benchmark blue. Here's how colour, clarity and origin actually shape what a stone is worth.

Ethics & Sourcing·May 5, 2026·10 min read

Ethical Gemstone Certifications: Which Ones Matter?

Most ethical gemstone certifications were built for diamonds and large industrial mines, not Sri Lankan sapphires. Here is what each one actually covers, and what to ask a dealer when no scheme fits.

Understanding·April 4, 2026·9 min read

How to Read a GIA Sapphire Certificate (With Examples)

A GIA sapphire report confirms what a stone is, how it has been treated, and in many cases where it came from. Here is a field-by-field walkthrough, plus the red flags to watch for when a report arrives with a stone.

Understanding·March 7, 2026·10 min read

Unheated vs Heat-Treated Sapphire: Real Difference (2026)

Heat treatment is the single biggest price lever in the sapphire market. Here is exactly what it does to the stone, and when paying the unheated premium is worth it.

Understanding·February 14, 2026·8 min read

How to Tell if a Ceylon Sapphire Is Real (2026)

Visual checks can point you in the right direction, but the only reliable proof that a sapphire is from Ceylon is a laboratory report. Here is what to look for before you spend.

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