Petoskey Stone Brooch Michigan Fossil Coral Vintage Pin

This Petoskey Stone brooch is a polished Michigan fossil coral pin made from Hexagonaria percarinata with a gold tone metal safety clasp on the back.

The rounded stone has a glossy polished face with a clear coral cell pattern, while the back remains partly natural and shows aged amber colored adhesive around the attached pin finding.

It is a small piece of Michigan regional jewelry that works well in a fossil collection, lapidary jewelry group, or Great Lakes keepsake display.

Details

• Item: Petoskey stone brooch
• Item Type: Polished fossil coral pin brooch
• Era: Not confirmed from photos
• Materials: Petoskey stone fossil coral, gold tone metal pin finding, adhesive
• Color: Brown and cream stone with gold tone metal
• Maker and Mark: No visible maker's mark
• Pattern or Model: Natural Hexagonaria percarinata coral cell pattern
• Style: Michigan regional fossil jewelry
• Dimensions: Approximately 1 1/4 inches at the longest point by 1 inch wide. Product weight approximately 0.4 ounce
• Special Features: Polished fossil face, natural texture visible on the back, mounted brooch finding with rollover safety clasp

Condition Grade: Very Good

Positives

• Graded Very Good: The brooch remains complete and wearable, with light age related wear visible on the mounting hardware and adhesive.
• The polished front retains a glossy surface and shows the tightly packed fossil coral cells clearly across most of the stone.
• The brooch finding remains attached, and the rollover safety clasp and pin stem are present.
• The irregular rounded shape keeps the natural form of the stone rather than making it look like a uniform manufactured cabochon.

Issues / Wear

• The gold tone metal finding shows age related darkening and surface wear.
• Amber colored aged adhesive is visible around the metal mounting plate on the back.
• The unpolished back shows the natural rough texture and color variation of the fossil stone.
• Small surface marks are visible on the polished face under close light.

Condition Grade Key

• Near Fine: Close to new. Any flaw is small and named above.
• Very Good: Light use. Every flaw is named above, and none of them get in the way of reading or display.
• Good: Complete and usable, with clear signs of use. Every flaw is named above.
• Fair: Heavy wear or damage, named above. A reading or working copy, not a display piece.

Collector's Notes

This example is worth noticing for the contrast between the glossy polished front and the more natural fossil texture left visible on the back. The aged amber adhesive and simple metal safety clasp also show how the stone was mounted rather than hiding the construction.

It is a small, straightforward piece with the fossil pattern doing most of the work.

Shipping + Trust (Reading Vintage standards)

• Photo-verified condition, no surprises
• Packed with care. Glass and fragile pieces get extra cushioning
• Ships in 2 business days
• Free Shipping on $35+ (U.S. only)

Disclaimer

All items are vintage and may show signs of age, wear, or use consistent with their history. Photos show the exact condition of each piece, please review them carefully, as they are part of the description.

I do my best to capture colors accurately, but your monitor or device screen may display colors slightly differently from the actual item.

Please Note

These pieces come from estate collections and have been surface cleaned. You may wish to perform additional cleaning depending on your preference.

How Reading Vintage sources and grades every piece