Diamond Glossary

EGL - European Gemological Laboratory or EGL is a privately owned, for-profit, gemological lab.

EGL has numerous labs around the world. We have found that their grading differs from that of GIA.

EGL-USA - EGL USA split from EGL and became independently owned in 1986.

It has labs in New York, Los Angeles, Vancouver and Toronto. We have found that their grading differs from that of GIA.

Emerald Cut - See Shape.

Emerald cut diamonds are increasingly popular, with many celebrities having opted for emerald cut engagement rings. These rectangular, step cut stones have the advantage of appearing larger than their round counterparts due to their larger surface area. They also make fingers look slimmer, creating the illusion that your fingers are elongated. Less expensive than the round cut diamond, the emerald does have one main downfall: any imperfections are highly visible. It is therefore important to chose an emerald cut stone that has a high clarity grade. They are also less sparkly than rounds and reveal color more.

Etch Channels - angled openings (inclusions) at the surface, which protrude into the diamond.

Etch channels are rare but do exist. They are normally created either when gas escaped the stone during formation or are left behind when a diamond is laser drilled.

Extra Facet - sometimes, the cutter will add an extra facet.

Sometimes, the cutter will add an extra facet (so, there are 59 on a round brilliant, for example) often around the girdle, in order to remove an inclusion. While this is not optimal, an extra facet does not necessarily reduce the value of the diamond. The size, positioning and effect of the extra facet on the diamond’s symmetry will determine any variance in the value.

Eye-Clean - When a diamond has no inclusions visible to the naked eye.

Typically, when the diamond is of SI quality or better. The concept of eye clean can however differ from jeweler to jeweler. When buying an engagement ring, many will opt for a diamond that is eye clean rather than focus on buying the highest clarity grade. After all, if a flawless diamond looks the same to them as a VVS2 then it can make perfect sense. It is a simply a question of personal preference.