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An Octagon cut diamond is an eight-sided step-cut shape — essentially an emerald cut with each corner opened into a full, symmetrical facet instead of a small clipped corner, giving it a distinctly geometric outline. Guru Diam stocks Octagon cut as IGI-certified lab-grown loose diamonds, cut in-house, with 40 pieces currently on hand.
What is an Octagon cut diamond?
Start from an emerald cut: a rectangular step cut with the four corners trimmed off as small clips so the stone doesn't chip at sharp points. An Octagon cut takes that same trim and opens it into a full-length facet on each corner, so the outline reads as eight distinct sides instead of a rectangle with the corners knocked off. The step faceting itself — broad, flat, parallel planes — stays the same, which means an Octagon cut throws the same quiet, hall-of-mirrors flash as an emerald cut. What changes is the silhouette: more geometric and architectural, less classic-rectangular.
That makes Octagon a good fit for settings built around clean, repeating geometry — bezel work, Art Deco-style mountings, and pieces where the stone's outline is meant to read as a shape in its own right rather than disappear into a standard rectangular profile.
Octagon vs. Emerald vs. Asscher
| Spec | Octagon | Emerald | Asscher |
|---|---|---|---|
| Outline | 8 distinct sides | Rectangle, small clipped corners | Square, small clipped corners |
| Faceting | Step-cut | Step-cut | Step-cut |
| Proportions | Elongated, corners as full facets | Elongated rectangle | Square |
| Light behavior | Hall-of-mirrors, geometric flash | Hall-of-mirrors | Hall-of-mirrors, more concentrated |
| Clarity visibility | High — step facets show inclusions | High | High |
Because step-cut facets are large and flat, clarity matters more on an Octagon cut than it does on a brilliant shape of the same carat weight — inclusions that a brilliant cut would hide are more visible through broad, open facets. Ask for clarity grade alongside carat weight when quoting, not carat weight alone.
Sourcing Octagon wholesale
Most wholesalers who carry step cuts stock emerald and asscher as standing inventory and treat Octagon as a one-off request, which is why it's hard to find in depth from a single source. Lab-grown production removes the reason for that gap — an Octagon cut is cut to the same spec discipline as an emerald or asscher, just with the corners carried out as full facets, so it's just as sourceable as either of those shapes once a cutter has the template.
Guru Diam stocks Octagon cut as CVD lab-grown, IGI-certified inventory — 40 pieces on hand now, with made-to-order cutting available for sizes outside current stock. In-stock pieces ship same-day from New York; made-to-order cutting plus a finished custom piece (CAD to jewelry) runs 4–6 days.
Source Octagon cut trade-priced, in stock now
Guru Diam carries Octagon cut as IGI-certified lab-grown loose inventory from our New York and Los Angeles desks, with real-time online inventory and API/CSV feed access for trade accounts.
Ready to buy? Open a verified wholesale account at /signup and book time with a gemologist at /book-appointment.
Frequently Asked Questions
What is an Octagon cut diamond? An Octagon cut diamond is an eight-sided step-cut shape — essentially an emerald cut with each corner cut as a full facet rather than a small clip, giving it a distinctly geometric, eight-sided outline instead of a rectangle with trimmed corners.
How is an Octagon cut different from an Emerald cut? Both use the same step-cut faceting and the same broad, hall-of-mirrors light behavior. The difference is the corners: an emerald cut has small clipped corners on an otherwise rectangular outline, while an Octagon cut carries those corners out as full, symmetrical facets, so the stone reads as eight distinct sides.
Are Octagon cut diamonds certified? Yes. Guru Diam's Octagon cut inventory is CVD-grown and IGI-certified, with GIA certification available on request.
Does clarity matter more for an Octagon cut than a brilliant shape? Yes. Step-cut facets are broad and flat, which shows inclusions more readily than a brilliant cut's many small facets would at the same carat weight. It's worth asking for clarity grade alongside carat weight when sourcing.
