One of the most expensive mistakes a jewelry collector can make happens before a piece is ever insured: acquiring the wrong piece in the first place. 

While conversations about protecting jewelry often focus on insurance, storage, and appraisals after an acquisition, experienced collectors know that many of the most important risk management decisions happen before a purchase is ever made. Alex Goodman, Director of Fine Art & Collections Solutions at PURE Art Services, explored this topic during a recent conversation with jewelry expert and New York's only Certified Master Appraiser, Yosef Caldaron, PURE Member since 2025. 

The choices made during acquisition, from verifying documentation to understanding provenance and market dynamics, can reduce risk and avoid unnecessary friction later. For collectors and family offices overseeing significant acquisitions, thoughtful due diligence helps minimize the likelihood of overpayment or discovering issues years later during an appraisal, sale, estate disposition or insurance claim.  

While a purchase receipt confirms what was bought and what was paid, a comprehensive appraisal documents the asset itself. It establishes insurance value, supports estate planning and provides the detailed specifications needed to make replacement significantly more straightforward if a piece is ever lost. 

This is especially important for custom and bespoke jewelry. A reputable appraisal should include the exact gemstone measurements, mounting specifications, and size and quality characteristics of the stones. 

Without that level of documentation, replacing a one-of-a-kind piece—or even establishing its value years later—can become significantly more difficult.  

One of the most common misconceptions among collectors is treating jewelry as a single market, assuming it appreciates uniformly over time. 

Diamonds, colored gemstones, pearls, watches and gold each respond to different supply and demand dynamics. Some categories, such as Paraíba tourmalines, have appreciated dramatically as supply has diminished. Rising gold prices have also increased replacement costs for sizable gold jewelry. Other categories, including South Sea pearls, have experienced significant declines from historic highs.  

Understanding those differences helps collectors make more informed acquisition decisions and set realistic expectations for future appraisals, resale and long-term value. 

Lab-grown diamonds illustrate just how quickly jewelry markets can evolve. Today, they account for roughly half of engagement ring purchases and have significantly affected pricing downward for natural diamonds, particularly when those natural diamonds are under approximately two-and-a-half carats. At the same time, prices for lab-grown diamonds themselves have fallen rapidly as production has expanded. 

While this may feel like a modern disruption, Caldaron points out that the industry has seen this pattern before. Synthetic rubies and sapphires entered the market more than a century ago, initially commanding premium prices before becoming widely available.  

An experienced gemologist can typically identify a synthetic ruby or sapphire through visual examination, as they appear unnaturally clean or too perfect, whereas lab-grown diamonds are different. Chemically and structurally, they are diamonds, making them virtually indistinguishable from natural diamonds through visual inspection alone. Even highly trained gemologists rely on specialized instruments to analyze diamonds under fluorescence to determine whether they were formed underground or in a laboratory. And even those instruments are not infallible. Caldaron recounted instances where exceptional natural diamonds initially tested as lab-grown before final laboratory analysis confirmed their natural composition.  

Some gemstones command extraordinary premiums because of where they originated. 

Burma rubies, Kashmir and Burma sapphires, Colombian emeralds, and Brazilian Paraíba tourmalines are increasingly sought after not only for their beauty but also for their rarity and provenance.

Collectors today increasingly view these exceptional gemstones as "wearable investments," making origin an important contributor to both collectability and long-term value. 

Independent verification of origin is an important part of the acquisition process. Geographic origin is an expert opinion supported by gemological analysis—not simply a description on a sales receipt.  

Carat weight naturally attracts attention, but experienced collectors know rarity often has a greater influence on long-term desirability. 

In many cases, a smaller gemstone with extraordinary quality may prove more desirable than a much larger stone with significant treatment or visible inclusions. 

As Caldaron puts it, "It would be better to have bought a smaller ruby... that was unheated and finer quality." 

Making acquisition decisions based on rarity, quality, and provenance—not simply size—can help build a collection that is more resilient as markets evolve over time.  

Ongoing collection management helps reduce friction throughout the lifecycle of a collection.  

Keep a current inventory with photographs, appraisals, laboratory reports, and purchase documentation. Review appraisals periodically to help ensure insurance values remain current. Frequently worn jewelry should also be annually inspected by a trusted jeweler to identify loose stones, worn prongs, or other issues before they result in a loss. When not being worn, jewelry should be stored in a home safe that is bolted as well as tool- and fire-resistant.