FORTUNA Learning Center
Guides to fine jewelry, gemstones, luxury watches, handbags, and the art of buying and selling at auction.
Every week, FORTUNA’s specialists handle estate jewels, signed pieces, certified gemstones, collectible watches, and designer accessories on their way to auction. The Learning Center distills that daily practice into clear, honest guides — whether you are preparing to bid, considering a sale, settling an estate, or simply curious about what makes an object exceptional.
Choose your path
Eight short routes into the Learning Center, matched to where you are right now.
New to Auctions
Estimates, reserves, increments, buyer’s premium — how a FORTUNA auction actually works, explained calmly.
Begin → Start HereI Inherited Jewelry
Understand what you have before deciding what to do with it — periods, marks, condition, and the questions specialists ask first.
Begin → Start HereI Want to Sell
From first conversation to final settlement: how consignment works and what your jewelry’s journey looks like.
Begin → Start HereI Want to Buy
Reading lot descriptions, judging condition, setting limits, and bidding with confidence.
Begin → Start HereI Collect Watches
Movements, condition, originality, box and papers — the details that define a collectible watch.
Begin → Start HereI Collect Signed Jewelry
Why a signature changes everything — and how maker attribution is actually established.
Begin → Start HereI Want to Understand Gemstones
Color, origin, treatment, and laboratory reports — the language of rubies, sapphires, and emeralds.
Begin → Start HereI’m a Professional Partner
Attorneys, appraisers, and jewelers: recognize referral-worthy pieces and give clients sound guidance.
Begin →Nine fields of knowledge
Structured, evergreen guides written in plain language — each one a door into a deeper set of articles.
Fine Jewelry
Estate, vintage, and antique jewelry; the great periods and styles; signed pieces; metals, settings, condition, and provenance.
Explore → CategoryDiamonds
The Four Cs and what lies beyond them — old cuts, fluorescence, certification, and how diamonds are described at auction.
Explore → CategoryColored Gemstones
Rubies, sapphires, and emeralds: color, origin, treatment, durability, and the laboratory reports that matter.
Explore → CategoryLuxury Watches
Mechanical movements, complications, condition, service history, and the documentation collectors prize.
Explore → CategoryHandbags & Accessories
Hermès, Chanel, and Louis Vuitton in the secondary market — condition grading, authenticity, materials, and care.
Explore → CategoryMaisons & Makers
The houses and workshops behind great jewels and watches — and why attribution can matter as much as material.
Explore → CategoryThe Auction Guide
How buying and selling at auction works, from estimates and reserves to invoices, shipping, and settlement.
Explore → CategoryCare & Preservation
Storing, cleaning, insuring, and documenting fine pieces — between wearings, and between generations.
Explore → CategoryGlossary
Plain-English definitions for the terms you will meet in catalogs, condition reports, and conversations with specialists.
Explore →Start with the essentials
The guides our specialists most often wish every client had read first.
The Four Cs, Explained
Carat, color, clarity, cut — what each really means, and how they interact in the value of a diamond.
Read the Guide → Fine JewelryAntique, Vintage, or Estate?
Three words often used interchangeably — and why the differences matter to collectors and to value.
Read the Guide → Auction GuideHow to Buy at Auction
A calm, complete walkthrough of registering, reading lots, bidding, and what happens after you win.
Read the Guide → Luxury WatchesMechanical Watches: A Primer
Manual and automatic movements, complications, and why mechanical craft still anchors collecting.
Read the Guide → GemstonesRuby, Sapphire & Emerald
The big three of colored stones — how color, origin, and treatment shape beauty and price.
Read the Guide → Luxury WatchesBox, Papers & Provenance
What “full set” means, why documents matter, and how provenance is weighed at auction.
Read the Guide → HandbagsDesigner Handbag Condition
How condition and completeness are judged for Hermès, Chanel, and Louis Vuitton in the secondary market.
Read the Guide → Auction GuideHow to Sell Jewelry at Auction
Consignment from first photo to settlement — timelines, estimates, reserves, and what to expect.
Read the Guide → Fine JewelryThe Art Deco Style
Geometry, platinum, and calibré-cut color — why the 1920s and 30s still command the room.
Read the Guide →Thinking of selling?
Understanding the process makes for better outcomes — and calmer decisions. Four short reads before you consign anywhere.
What Belongs at Auction
What makes a piece suitable for auction — and when another path may serve you better.
Read →Estimates vs. Reserves
What an estimate is, what it is not, and how a reserve quietly protects the seller.
Read →Provenance & Documentation
Receipts, reports, and family history: what helps, what does not, and what to gather first.
Read →How Specialist Review Works
What our specialists examine, why it is free, and what a considered opinion includes.
Read →Bid with confidence
The handful of ideas that turn a first-time bidder into a comfortable one.
Reading a Lot Description
How catalog language works — and the difference between “signed”, “attributed”, and “in the style of”.
Read →Condition Reports
What a condition report covers, how to request one, and how to read between its lines.
Read →Bidding Terminology
Hammer price, increment, absentee bid, fair warning — the vocabulary of the saleroom.
Read →Buyer Responsibilities
Premiums, payment, and shipping — the formal terms every bidder agrees to. Read them once; bid easier forever.
Read →The names behind the pieces
Houses and workshops often encountered in the secondary and auction market — and what collectors look for in each.
Cartier
Panthère, Tank, Tutti Frutti — design authority across jewels and watches alike.
Learn → Jewelry MaisonVan Cleef & Arpels
The Mystery Set, Alhambra, and a poetic house style collectors recognize at a glance.
Learn → Jewelry MaisonTiffany & Co.
From Schlumberger’s fantasies to timeless solitaires — an American house with deep auction presence.
Learn → Jewelry MaisonBulgari
Roman color and confidence — Serpenti, Tubogas, and bold cabochon design.
Learn → WatchmakerRolex
The reference-and-serial language of the most traded watches in the world.
Learn → WatchmakerPatek Philippe
Complications, archives, and the quiet apex of traditional watchmaking.
Learn → WatchmakerAudemars Piguet
The Royal Oak and the octagonal idea that reshaped luxury sports watches.
Learn → HandbagsHermès
Birkin and Kelly: craftsmanship, leathers, and the discipline of condition.
Learn → HandbagsChanel
The Classic Flap and 2.55 — quilting, hardware, and era-by-era details.
Learn → HandbagsLouis Vuitton
Canvas, trunks, and collaborations — reading date codes and condition with care.
Learn →Brand and maison names appear for descriptive and educational purposes. FORTUNA is an independent auction house and is not affiliated with, or endorsed by, these maisons.
Speak the language
A few of the terms you will meet in catalogs and condition reports. The full glossary holds many more.
- Auction Estimate
- A specialist’s published guide to a lot’s expected hammer range — a guide, not a guarantee.
- Reserve
- The confidential minimum price below which a lot will not sell.
- Hammer Price
- The winning bid at which a lot closes, before buyer’s premium.
- Buyer’s Premium
- The percentage added to the hammer price, payable by the buyer — published in the Conditions of Sale.
- Provenance
- The documented history of an object’s ownership and origins.
- Condition Report
- A specialist’s written account of a lot’s state, wear, and any alterations.
- Lot
- A single item — or group of items — offered for sale as one unit.
- Absentee Bid
- A maximum bid left in advance and executed on your behalf as the bidding unfolds.
- Signed Jewelry
- A piece bearing the signature or mark of its maker — often commanding a premium.
- Maker’s Mark
- The registered stamp identifying the workshop that made a piece.
- Hallmark
- Official marks attesting to a metal’s fineness, and sometimes its origin and date.
- Carat vs. Karat
- Carat measures gemstone weight; karat measures gold purity.
- Old European Cut
- The hand-cut ancestor of the modern round brilliant, prized for warm, soft light.
- Cabochon
- A gemstone polished into a smooth dome rather than faceted.
- Box & Papers
- A watch’s original packaging and documents — the “full set” collectors seek.
- Reference Number
- The model number identifying a watch design, distinct from its unique serial.
Have a piece you would like to understand better?
Our specialists review fine jewelry, diamonds, gemstones, watches, and designer accessories every day — and are glad to help you see your piece the way the market does.
Valuations are complimentary and carry no obligation. Learning Center content is educational and does not constitute a formal appraisal.