Episode 04 — The Gemmacol Podcast
Why does almost every emerald have inclusions? Is the jardin a flaw or a fingerprint? Does it make the stone fragile — and should a buyer ever be suspicious of an emerald that looks perfectly clean?
In this episode, we answer the questions buyers ask most about the inner world of an emerald — what the jardin is made of, what it reveals about origin and authenticity, how it affects value, and how to care for a stone that carries its geological history inside it.
What Is the Jardin?
Jardin is French for “garden”. The term describes the network of inclusions inside an emerald — fluid cavities, fine fractures, mineral crystals, and growth features that, under magnification, resemble moss, foliage, or branching plants. Emerald grows in a chemically turbulent environment, and the crystal traps traces of that environment as it forms. Inclusions are therefore not an exception in emerald; they are the norm.
This is why emerald is graded on a different scale from diamond. The trade expects inclusions and accepts those that do not significantly affect beauty or durability. A visible jardin is not automatically a defect — what matters is its type, its position, and its effect on the stone face-up.
Reading the Garden — The Main Types of Inclusions
Not all inclusions carry the same meaning. Some are diagnostic of origin, some affect durability, and some are simply part of the stone’s character. The Colombian trade has its own vocabulary for them.
| Inclusion | Trade Term | What It Looks Like | What It Tells You |
|---|---|---|---|
| Three-phase inclusion | Trifásica | Jagged cavity holding liquid, a gas bubble, and a tiny salt cube | Classic signature of Colombian origin and natural growth |
| Two-phase inclusion | Bifásica | Cavity with liquid and a gas bubble | Natural growth environment; common in many sources |
| Feather / fissure | Pluma | Fine, feather-like fracture planes | Most relevant to durability and to oiling |
| Mineral crystals | Cristales | Small trapped crystals such as pyrite, calcite, or albite | Evidence of the host rock; supports origin determination |
Three-phase inclusions are strongly associated with Colombia, but similar features occur in a few other deposits. Laboratories never rely on one inclusion alone — they combine the jardin with chemical and spectroscopic analysis before stating an origin.
Frequently Asked Questions
These are the questions buyers ask most when they first look at an emerald under a loupe.
Not necessarily. Colour is the primary value driver in emerald, and a stone with exceptional colour and a visible jardin can be worth far more than a cleaner stone with weak colour. Inclusions reduce value when they are large, central, reach the surface, or dull the stone’s brightness face-up.
Fractures that reach the surface are the main risk. Emerald is hard but relatively brittle, and a sharp knock on an open fissure can cause chipping. This is why protective settings, bezels, and the cropped corners of the emerald cut matter — and why fractures are assessed for position, not only size.
Eye-clean natural emeralds exist and command significant premiums — but they are rare, especially at fine colour and larger sizes. A flawless-looking stone offered at an ordinary price deserves verification: synthetic emeralds and imitations are often cleaner than natural material. A laboratory certificate settles the question.
Caring for a Stone with a Garden
Because most emeralds contain fissures — and most of those are oiled — care is about protecting both the crystal and its clarity enhancement.
Vibration and heat can widen existing fissures and drive the oil out of them, making the jardin more visible. Never use either on an emerald.
Lukewarm water, a drop of mild soap, and a soft brush are enough. Rinse and dry with a soft cloth. Avoid solvents and household chemicals.
Remove emerald rings for sport, gardening, and heavy work. Ask any jeweller doing repairs to keep the torch away from the stone, or to remove it first.
Over years of wear, oil can slowly dry out and the jardin may appear more prominent. A specialist can clean and re-oil the stone — a routine, reversible service for traditionally oiled emeralds.
Judge the jardin by its effect, not its existence. Look at the stone face-up, in daylight, at arm’s length. Ask whether any fracture reaches the surface, and check the treatment designation on the certificate. A garden that leaves the colour alive is part of the stone’s value — not a deduction from it.
Gemmacol supplies certified Colombian emeralds — Muzo, Chivor & Coscuez origin — directly to jewellers, designers, and auction houses across Europe. All stones ship with full GIC origin and quality documentation.
Trade enquiries: info@gemmacol.com
