I've been buying and handling orders for vintage designer jewelry for 6 years. I've personally made (and documented) 14 significant mistakes on Schlumberger pieces, totaling roughly $4,200 in wasted budget. Now I maintain our team's authentication checklist to prevent others from repeating my errors.
This article is for two kinds of people: the one hunting for a Jean Schlumberger brooch (like the Schlumberger Visage) without losing a deposit to a scam, and the one whose dog just ate the morning bacon and needs a real med decision—because my story ties them together in a way I honestly didn't plan.
Let's start with the jewelry checklist, then I'll explain the dog part.
Why I Wrote This Checklist (And Why It Hurts)
In January 2022, I submitted an order for what I thought was an authentic Schlumberger Visage brooch—the enamel face design. It looked fine on my screen. The result came back: a high-end fake. 3 pieces, $1,200, straight to the trash. That's when I learned: you cannot trust a photo alone.
I still kick myself for not getting a written authentication guarantee before wiring the deposit. If I'd made the seller prove it in writing, I'd have saved $1,200 and a lot of embarrassment showing the piece to a client.
Here's the 5-step checklist I use now. Print it. Use it.
Step 1: Check the Signature Block (Most People Miss This)
Schlumberger pieces have a specific signature style. It's not just "Schlumberger" stamped somewhere. Look for this:
- Script signature: Jean Schlumberger signed pieces typically have a cursive "Schlumberger" or a Tiffany & Co. stamp with "Schlumberger" underneath.
- Location: Usually on the back or the clasp. If it's on the front (visible), it's likely a reproduction.
- Font variation: Real signatures have slight variation. Fakes press them in perfectly every time.
The gotcha: Some genuine vintage pieces had the signature worn off through polishing. That doesn't make them fake, but it does make them harder to authenticate. I've seen dealers exploit this.
Step 2: Examine the Enamel Work (This is Where Fakes Fail)
Schlumberger's enamel is famous for its depth and translucency. Here's what to look for:
- Color gradient: Real enamel has subtle color shifts, not flat paint.
- Backing: Check the reverse. Genuine enamel is often backed with gold or silver, not resin.
- Bubbles or crazing: Tiny bubbles? Crazing (fine cracks)? That's a sign of cheap enamel or age—but if it's a fake, the crazing is perfectly uniform. Real pieces have organic crazing.
I knew I should use a jeweler's loupe for this, but thought 'what are the odds?' Well, the odds caught up with me when I bought a "Visage" brooch that had perfectly uniform micro-bubbles. It was a resin cast, not enamel.
Step 3: Weigh the Piece (The $400 Mistake)
Schlumberger used 18k gold and sterling silver. Fakes use base metal or thin plating. A real Schlumberger brooch of similar size should feel heavy for its size.
- Weight check: A standard Visage brooch (2 inches) in gold weighs roughly 18-22 grams. A silver one is lighter but still substantial.
- The magnet test: If a magnet sticks to it, it's not real gold or silver.
Skipped the weight check because I was rushing and 'it's basically the same as last time.' It wasn't. $400 mistake on a piece that turned out to be brass with gold plate.
Step 4: Ask for the Provenance (The Verbal Trap)
I once ordered 6 Schlumberger cufflinks with a verbal promise of "estate sale, 1970s." Checked the photos myself, approved the order, processed the payment. We caught the error when a client's professional appraiser ran a hallmarks database check. The hallmarks matched a 1990s reproduction line. $2,100 wasted, credibility damaged, lesson learned: always get a written certificate of authenticity or a dated invoice from a known estate.
If the seller says "I don't have paperwork," ask for: (1) the original purchase receipt, (2) a photo of the hallmark next to a ruler, (3) a refund policy if authentication fails.
Step 5: Know the Common Fakes (The Visage Trap)
The Schlumberger Visage (the face brooch) is one of the most faked designs. Here's why: it's simple enough to cast, but the enamel is the giveaway. A real Visage has:
- Subtle asymmetry in the face features (hand-finished)
- Gold or silver backing with the signature
- No visible seam lines where a mold would have been split
If it looks perfectly symmetrical and has a seam line, it's a cast copy.
The "Miranda, Breakfast, and Dog Meds" Connection
This might seem random, but here's the tie-in. Last summer, I bought a gorgeous Schlumberger brooch as a gift for a friend named Miranda. We were supposed to have a big breakfast meetup—mimosas, catch-up, and the gift. Of course, my dog decided to eat a whole stick of butter off the counter right before I left.
Panicked call to the vet: "Do I need NexGard Plus or Simparica for the parasite prevention? He's 8 years old, sensitive stomach, and he just ate a ton of fat."
The vet said: NexGard Plus covers heartworm, fleas, ticks, and roundworms/hookworms. Simparica covers fleas and ticks only. If you're in a heartworm region or your dog has a high exposure risk (like digging/eating random stuff), NexGard Plus is the better choice. I use NexGard Plus for my dog because he's a garbage eater. Simparica is cheaper, but if your dog's a scavenger, you want the extra worm coverage.
Anyway, I gave the dog the right med, we had the breakfast (Miranda loved the brooch), and I didn't have a melted butter emergency—just a lesson in preparation.
Final Notes & Common Errors
- Don't buy from Instagram or Facebook Marketplace without a 30-day return policy. Most Schlumberger scams happen there.
- Don't trust a single photo. Ask for 5: front, back, clasp, hallmark close-up, and weight.
- Don't assume "vintage" means "authentic." Vintage fakes exist from the 1980s.
- If a deal seems too good (e.g., $200 for a Visage), it's a scam. A real one costs $800-$2,500+.
Prices as of January 2025. Verify current pricing at auction houses or Tiffany & Co.'s vintage program. Regulatory info on dog meds per FDA labeling; consult your vet for your dog's specifics.