Sapphire and Diamond Brooch Set with Brilliant-cut and Baguette Diamonds, Accented with an Oval Sapphire, French Assay M

French assay marks on platinum and gold are a small detail with an outsized meaning: they confirm that this brooch passed through an official hallmarking system that has protected buyers of fine jewelry for well over a century. That single clue tells you this is not a costume piece dressed up in fine language — it is a genuine work of goldsmithing, built to a standard that had to be proven before it ever left the workshop.

The design centers an oval-cut sapphire, its cool blue held in a setting of brilliant-cut and baguette diamonds. The baguettes do quiet structural work, tracing clean geometric lines around the softer curves of the oval stone, while the brilliant-cuts scatter light across the surface as the piece catches movement. Carat weight and colour grade for the sapphire are not specified in our archive record, so we list them, honestly, as on request — a client considering this piece is welcome to request full gemological detail before any commitment is made.

Worn on a lapel, this brooch has the kind of restrained sparkle that reads as old-world taste rather than new-money volume — the platinum-and-gold combination itself is a signal of that era's craftsmanship, when jewelers alloyed precious metals deliberately rather than defaulting to a single tone. It fastens as comfortably to the shoulder of an evening gown as it does to the lapel of a tailored coat, and its scale makes it equally suited to anchoring a silk scarf or securing a wrap on a cool evening. The pin's fitting is built for that kind of daily versatility; ask your advisor about the mechanism specifics and any accommodations for converting it to a pendant, should that suit your wardrobe better.

Brooches of this vintage character are increasingly sought by collectors precisely because so few survive with original hallmarks intact. Owning one is as much about provenance as it is about beauty — a tangible link to a goldsmithing tradition that valued permanence over trend. As with all fine coloured stones, a well-documented sapphire tends to hold its desirability across market cycles, making this the sort of piece that both adorns and endures.

Independent certification is available on request, and our team can walk you through the assay marks, metal composition, and stone provenance in detail. This brooch is entered in the Legacy register, and we handle every transaction with the same discretion we'd want if the roles were reversed.

If the pairing of oval sapphire and diamond geometry appeals to you, we invite a private conversation — no pressure, simply an open door to ask questions, request documentation, or arrange a viewing at your convenience.

Specifications

• Metal: Gold Platinum
• Cut / Shape: Baguette, Round Brilliant, Oval
• Gemstones: Sapphire