Finding Your Way Through Coro Jewelry

Coro was a major American costume jewelry manufacturer that operated from 1904 until it was sold to Tri-State Jewelry in 1967, after which the name continued under various owners until roughly 1993. If you are picking up pieces at estate sales, thrift stores, or online, you will quickly notice the market is inconsistent. Some sellers know exactly what they have. Most do not. I spent years buying and reselling Coro, and the single most useful thing I learned was that the back of the piece tells you far more than the front. Marks, construction details, and material clues combine to separate a $30 item from a $300 one, and occasionally from something worth over a thousand if you hit the right rarity.

Coro Jewelry A Collectors Guide Identification Values

This section covers what I actually use when I am trying to identify and price Coro jewelry, along with a few things that do not work the way most guides suggest. Coro used several different hallmarks over its history, and they changed without much consistency. The most common marks you will see are: "Coro" – Simple stamp, usually on pieces from the 1930s through the 1950s. Sometimes appears as just the word, sometimes with "USA" underneath.

"Coro Craft" – Used on higher-end lines, typically late 1940s to early 1960s. These pieces often have more substantial metal content and better stone work. "Coro Originals" – This mark appeared on select pieces, mostly from the 1950s onward. Not every "Coro Originals" piece is rare, but the line tended to be better quality overall. "Crown" logo – The early Coro crown mark, sometimes found on pre-1940s pieces. It is a small stamped crown, often near the clasp or on the back of a brooch.

"Perry Eggs" or "Coro Perry" – Fredriq (Freddy) Eickstedt designed many Coro pieces under the Perry name in the late 1940s and 1950s. These are among the most collectible. One thing most people miss: Coro also made jewelry for other companies. A piece marked "Conni" or "Marcasite" may have been manufactured by Coro but sold under a different brand. The build quality and construction methods can still match Coro standards even without a Coro mark.

Materials and Construction Clues

Coro jewelry was costume jewelry, which means base metals, not solid gold or sterling silver. However, the quality varied significantly across decades and product lines. Most Coro pieces use gold-tone metal that is actually brass or pewter alloy with gold plating. The plating thickness matters a lot. Earlier pieces (1930s–1940s) often had thicker, more durable plating. Later mass-market pieces from the 1960s onward frequently show thin plating that wears through quickly, especially on high-contact areas like ring shanks and clasp joints. Silver-tone pieces are usually nickel silver or zinc alloy. Some later pieces (1970s+) are sterling silver. Check carefully for "Sterling" stamps. If it is just "925" with no other mark, it may still be genuine, but Coro was not consistent with their silver hallmarks.

The stones are almost always rhinestones – specifically paste or later, glass rhinestones with metallic backings. Coro was known for using high-quality Austrian rhinestones in their better lines. The backing glue and setting method can help date a piece. Early pieces used silver-colored foil backing behind the stones. Later pieces switched to colored foil or plastic backings, and some 1970s pieces used clear plastic settings with no foil at all. A detail I check every time: the clasp type. Fold-over clasps are common on Coro necklaces and bracelets from the 1940s–1950s. Safety chains on necklaces are a sign of mid-century construction. Later pieces sometimes use lobster clasps or spring rings. The presence of a specific clasp type can help narrow down the era even when the mark is worn off.

Pricing and Value Ranges

Market prices for Coro vary enormously. Here is what I see in practice, based on recent auction results and private sales over the past few years: Common Coro pieces (plain gold-tone bracelets, simple earrings, basic brooches): $15 to $50. These are abundant and not highly sought after unless they are in exceptional condition. Mid-range Coro (Craft line, decent condition rhinestone pieces, signed Perry designs): $50 to $200. Condition is critical here. Original rhinestones with intact foil backing command significantly more than pieces that have been re-glued or cleaned aggressively.

High-end Coro (signed Fred Eickstedt designs, Coro Craft statement pieces, rare colors or unusual materials): $200 to $800. Some signature Eickstedt pieces, particularly the large costume sets or novelty brooches, have sold for over $1,000 at auction, but those are the exception. Pieces without marks are harder to value. If the quality matches Coro construction standards, I typically price them 20 to 30 percent lower than comparable marked pieces, because buyers are cautious about attribution. One factor that dramatically affects value: originality. A Coro piece with replaced rhinestones, repolished metal, or a re-plated finish is worth considerably less than an original-survivor in the same visual condition. I once bought a Coro Craft brooch at a local estate sale for $8. It looked pristine. When I got it home and examined the stone settings under magnification, I found that at least six rhinestones had been replaced with later, slightly different cuts, and the foil backing on three of them was a modern adhesive rather than the original hand-placed silver foil. The value dropped from an estimated $150 to about $60 once I accounted for that.

Where to Find Reference Material

There is no single definitive printed guide for Coro jewelry. The closest thing to a standard reference is "Coro Jewelry: The Golden Age of American Costume Jewelry" by various authors, though editions vary in quality and accuracy. Online resources include the Coro Jewelry Collector website and active forums on platforms like Reddit (r/costumejewelry) and Facebook groups dedicated to vintage Coro collecting. For identification, I rely heavily on cross-referencing multiple sources. Auction results from eBay completed listings, Heritage Auctions costume jewelry catalogs, and specialized vintage jewelry auction houses provide the most reliable pricing data. I keep a spreadsheet tracking sale prices by mark, material, condition, and year to build my own internal database over time.

Common Pitfalls

Assuming all Coro is valuable. It is not. The vast majority of Coro production was affordable fashion jewelry made for department store counters. High volume, low margin. Only a small fraction of pieces are collectible today. Confusing Coro with similar brands. Trifari, Kramer, and Monet all produced jewelry in the same era with similar construction methods. Trifari pieces sometimes bear marks that look similar at a glance. Kramer jewelry from the 1950s, especially the "Krome and Kolor" line, is often mistaken for Coro. Learn the mark differences before you buy. Over-cleaning pieces. Polishing Coro rhinestones or metal with abrasive compounds will damage the original finish and reduce value. I have seen heavily polished Coro pieces lose 40 to 60 percent of their resale value compared to unrestored examples in the same condition. Clean with a soft, dry cloth only. If a piece needs professional restoration, find someone who specializes in vintage costume jewelry, not general jewelry repair.

What I Look for First When Evaluating a Piece

  1. Check the mark. Note the exact wording, placement, and condition of the stamp.
  2. Examine the rhinestones under a loupe. Look for original foil backing, chip-free stones, and intact settings.
  3. Inspect the metal for wear patterns. Heavy plating wear on high-contact areas is normal. Corrosion or pitting is not.
  4. Check the clasp, hinges, and any moving parts. These should function smoothly without excessive play or weakness.
  5. Research the specific design. Many Coro pieces have been photographed in collector databases and auction records. A quick image search can reveal comparable sales.

The process takes about ten to fifteen minutes per piece if you are experienced. Beginners may need thirty minutes or more per item until they build familiarity with the marks and construction details. That is normal. If you are starting out, focus on one category first. Earrings, brooches, or bracelets each have different rarity patterns and price points. Buying a broad mix too early tends to lead to overpaying on common pieces and missing the ones you actually want. Condition matters more than you might expect. A well-preserved common piece is often worth more than a damaged rarer piece, because the market for damaged vintage costume jewelry is very small. Most buyers are looking for display-quality items, not projects.

I have learned over time that the most rewarding part of collecting Coro is not the financial return – most people do not make money buying and reselling this material – but the process of learning to see the details that separate a marked Craft piece from a later mass-produced version, or recognizing an Eickstedt design before anyone else at the estate sale does.