Ten Drops of Light: The Napoleon Necklace

The Napoleon Diamond Necklace holds ten briolette-cut diamonds, mounted in 1811, and it is on public display in Washington. It was made by Etienne Nitôt and Sons of Paris as a gift from Napoleon to his second wife, Marie-Louise, after the birth of their son. You can stand in front of it.

That matters more than it sounds. The Briolette of India is the more famous briolette, but it is privately held and its history is largely invented. The Napoleon necklace is the opposite case: an imperial commission with a continuous, documented ownership chain, on view in a public collection, with the museum's own catalog number attached.

What the Smithsonian Records

The National Museum of Natural History holds the necklace as NMNH G5019. Its published description gives a level of detail rare in writing about historic jewelry.

The stones are cut in the old mine style, the immediate predecessor of the modern brilliant. Old mine cuts have higher crowns, smaller tables, and rounder outlines. The Smithsonian's description notes the trade-off directly: great dispersion — flashes of color as the stone moves — but less brilliance, because less light is returned through the top of the stone.

That is a useful calibration. In 1811, the most advanced cutting available still could not do what a modern brilliant does, and the briolette was a prestige form within that world.

Ten Briolettes, Nine Pendeloques

Look again at the pendant row: nine pendeloques and ten briolettes. Both are drop-shaped, both hang at the bottom of a necklace, and both are in the same object. This is the clearest available demonstration that they are not the same thing.

The pendeloques sit in mounts because they have a table and a flatter profile, and a mount can hold them. The briolettes cannot be held that way — with no table and no girdle, there is no facet for a prong to sit against. They hang, and each one needed its own drilled hole, cut in a stone that had already been faceted.

Ten drilled holes in diamond, executed in 1811, is the detail that makes this necklace worth the trip. How briolettes are drilled covers what that involved and what it means for the stone's survival over two centuries.

The Provenance, Step by Step

Unlike the invented history attached to the Briolette of India, this one is traceable and continuous, with a documented interruption when the necklace was altered.

The two stones Sophie removed became earrings. Their whereabouts are unknown — a small, honest gap in an otherwise complete record, and the kind of detail that only survives because a museum publishes its accession history.

The necklace is also displayed in its original case, which is unusual. It arrived at the Smithsonian that way via Marjorie Merriweather Post, and the case is part of the object's value as evidence rather than ornament.

Where the Sources Disagree

This is the part worth reading carefully, because it shows how quickly a documented object becomes an undocumented one in secondhand retellings.

The Smithsonian's catalog says 234 diamonds and an estimated total weight of 263 carats. A 1990s-era trade magazine article — JCK — describes the same necklace as a "47-diamond necklace (275 cts. t.w.)." Neither the diamond count nor the weight matches.

The Smithsonian holds the object and publishes its accession record, and its figure of 234 is consistent with its own itemized breakdown — 28 old mine-cut stones, nine pendeloque diamonds, ten briolettes, plus the accent stones. The trade account looks like a garbled summary rather than a rival count.

The lesson is not that magazines are careless. It is that a single materially wrong figure can enter circulation and sit alongside correct ones for thirty years without anyone reconciling it, because nothing forces reconciliation. When you next read a briolette count or weight quoted without a source, this pair of rows is the reason to be skeptical.

Why Old Mine Cuts Behave Differently

The briolettes in the necklace are not old mine cuts — they are briolettes, in a necklace whose main line is old mine cuts. But the two coexist in a way that illuminates both.

An old mine cut is a brilliant-family stone: it has a table, and it is meant to be viewed face-up. The Smithsonian notes the consequence — more dispersion, less brilliance. Motion helps both cuts, which is why the necklace has a fringe rather than a flat plate of stones. The pendeloques and the briolettes both move as the wearer moves, and the older cutting style emphasizes color flashes rather than a steady return of light, which is precisely what a swaying fringe can show off.

Set a briolette beside a modern round brilliant and the briolette will usually lose the comparison a photograph would judge, and win the one that movement judges. That is not sentiment. It is the optical difference that comes from having no table at all — a difference the cross-section view makes obvious in about two minutes.

The Napoleon necklace is the briolette's best-documented survival, and its pendant row makes the point that definitions cannot: nine pendeloques and ten briolettes hang side by side, and only one of the two can be mounted.

Going to See It

The necklace is in the Gem Gallery at the National Museum of Natural History in Washington, D.C., displayed beside the Marie-Louise Diadem. Admission to the museum is free, and G5019 is a published accession number, so you can ask about it by number.

Stand close enough to see the drilled apexes. In a gem hall full of face-up brilliants designed to be admired in stillness, ten stones that were made to swing are the anomaly worth the trip — and the only way to judge the one property of a briolette that no photograph can carry.