Floating diamonds, explained: how a drilled stone is set
A floating diamond isn't set in any traditional sense. There's no prong pinching it, no bezel wrapping the edge. The stone hangs from a chain that passes directly through a laser-drilled channel in the diamond itself — nothing between the stone and the light except air.
The technique isn't new. Drilled diamond pendants have existed since at least the 1970s, when high-precision lasers first made it possible to burn a clean channel through a diamond's hardest surface. But floating diamonds went from a novelty to a category around 2020, when a few brands built entire collections around the setting style and demonstrated what it could actually do.
How the drilling works
A laser directs a focused beam through the top of the stone — through the table, the flat facet at the crown — down to the pavilion at the pointed underside. The beam vaporizes a narrow channel, roughly 0.25 mm in diameter, wide enough to thread a fine chain but narrow enough to be nearly invisible to the eye once the stone is set.
Two ways the channel gets used. Point-drilled stones have one hole, typically near the top, and hang from a jump ring or chain like any pendant would. The stone dangles freely and turns with the wearer's movement, catching light from every angle. Two-point drilled stones have two channels — one on each side, or top-and-bottom — so the stone is held in a fixed orientation. This is how you get an oval or emerald cut set "east-west" (long side across the chain) instead of the traditional north-south. The chain passes through both holes, threading the stone into the line like a bead.
Why the setting reads brighter
Every traditional setting puts metal between the stone and the light. A bezel wraps the girdle in a solid band. A prong setting has four or six thin claws reaching over the crown. Even the most minimal setting still has something touching the stone's surface.
Floating stones have nothing. The pavilion — the underside of the diamond, where most of the light bounces around and exits back through the table — is completely uncovered. Light hits every facet without a metal shadow. The result is that a floating diamond of the same cut, color, and carat reads brighter and livelier than the same stone in a prong or bezel setting.
This isn't a subtle effect. Compare two 1-carat lab-grown rounds side by side, one prong-set and one floating, and the difference is visible from across a room.
Whether the stone can actually fall off
The most common concern about floating settings is whether the stone can fall off. It's a reasonable worry — no metal touching the stone sounds structurally suspect.
In practice, floating settings are more secure than most people expect, and often more secure than the alternatives. A prong can bend or wear down over years of contact with the world. A bezel can develop a hairline crack. A drilled channel is a permanent modification to a material that's the hardest known substance on the Mohs scale — the stone itself is what holds the chain.
The failure mode isn't the setting. The failure mode is the chain. If the chain breaks, the diamond goes with it. Which is why floating diamond pieces use heavier chain than most necklaces of similar delicacy would — typically 14k or 18k solid gold in a gauge that holds up to daily wear.
What can't be drilled
Not every stone is a candidate for floating. Softer gemstones don't drill cleanly — diamonds are 10 on the Mohs hardness scale, sapphires and rubies are 9, and both can be drilled by a specialized laser without cracking. Anything softer — emeralds, opals, tanzanite, most colored stones — is at high risk of chipping during the drilling process. A skilled cutter might attempt it for a specific commission, but it's not routine.
Stones with inclusions in the drill path can fracture. Every diamond has some pattern of inclusions internally; the drill needs a clear line through the stone. Certain stones have to be turned away or drilled at an unusual angle.
Very small stones — under about 0.20 carat — are hard to hold steady during drilling and don't have enough material for a stable channel. Most floating diamonds start at 0.30 carat.
The trace the drill leaves behind
There's a small trace of the drilling process visible in the stone. Looked at up close from certain angles, the channel appears as a thin dark line, roughly the width of a hair. From a normal viewing distance, it isn't visible. Held under magnification, it clearly is.
Some people love this — it reads as evidence of a specific technique, an intentional mark. Others find it distracting. It's worth looking at a floating diamond in person before ordering one, particularly for larger stones where the channel is proportionally more visible.
Where the technique belongs, and where it doesn't
Floating settings work best for pendants and necklaces, where the stone hangs freely and gets to move. They also work for charm-based pieces — a drilled diamond on a jump ring functions as an interchangeable charm that can move between different chains, or between a chain and a charm lock.
They don't work for rings. A ring needs a setting that holds the stone in a fixed position against constant contact with the world. Floating settings assume the stone is protected by hanging in air, which is impossible on a finger.
The Floating Diamond Collection at Catherine Peck holds the ready-made pieces — one-of-one drilled stones sourced individually. The Floating Diamond Studio lets you build a piece from scratch — choose the stone shape, size, and drilling orientation, then the chain length and metal.
For anyone considering the setting for the first time: order a smaller floating diamond charm before committing to a larger one. The visual effect that reads perfectly at 0.30 ct doesn't always scale up cleanly. Some stones — particularly some fancy cuts — are better as a smaller floating piece than a larger prong-set one. Others are the reverse.