Close-up of a hand polished natural calcified ammonite fossil showing spiral shape and iridescent yellow tones
Genuine Natural Calcified Ammonite Fossil (246 grams)
Genuine Natural Calcified Ammonite Fossil (246 grams)
Genuine Natural Calcified Ammonite Fossil (246 grams)
Genuine Natural Calcified Ammonite Fossil (246 grams)

Vendor:Astro Gallery of Gems

Genuine Natural Calcified Ammonite Fossil (246 grams)

$125.00

A spiral-shaped ammonite fossil featuring an iridescent, opalized shimmer with vibrant yellow highlights and a dendritic crystal pattern. Hand polished to reveal its natural calcification, this specimen weighs approximately 246 grams and measures about 3.25 x 1.75 x 2.5 inches. Each piece offers a unique natural pattern consistent with ammonite fossils.

  • Natural ammonite fossil with calcification and opalized iridescence
  • Distinct dendritic crystal pattern visible on the surface
  • Hand polished finish for enhanced texture and shimmer
  • Approximate size: 3.25 x 1.75 x 2.5 inches
  • Approximate weight: 246 grams

Exclusive Natural Fossil

Unique Authentic Ammonite Specimen

Exact Details

Ammonite Fossil Specifications

Type
Ammonite Fossil
Finish
Hand polished
Color
Opalized iridescence with yellow tones
Weight
Approx.
246 grams
Dimensions
Approx.
3.25 x 1.75 x 2.5 inches
Pattern
Dendritic crystals
Shape
Spiral fossil shell

What arrives

One natural calcified ammonite fossil specimen

Size and Form

Dimensions and Weight

Shipping and Returns

Delivery and Return Information

Shipping

Shipping rates and estimated delivery times are provided at checkout.

Returns

Return policies vary; please review details at checkout.
Close-up of a hand polished natural calcified ammonite fossil showing spiral shape and iridescent yellow tones

Quiet wonder, held in the palm.

A hand-polished ammonite with opalized shimmer and dendritic patterning—time’s spiral made visible.

Found form

The spiral that slows a room

Iridescence with history

Rooms often need an anchor that feels calm without shouting for attention.
The Genuine Natural Calcified Ammonite Fossil offers a grounded presence: subtle iridescence, soft yellows, and intricate dendritic patterns that reward a closer look.
At 246 grams and roughly palm-sized, it sits easily on a shelf or desk, making space feel considered.
Hand polishing lets the spiral catch light, inviting a pause.

A small pause, every day

Objects with time etched into them change how we gather.
This ammonite suggests conversation, study, and quiet—its opalized shimmer shifting as daylight moves.
The natural spiral holds the eye without cluttering the scene, turning a ledge or stack of books into a moment with depth.

For the detail-focused

Someone who notices surface, light, and scale—who wants a tactile, storied object for a desk, nightstand, or bookshelf.

Where it lives

Set it on a stack of art books or beside a reading chair where natural light can graze the polished shell.
Astro Gallery of Gems brand cover

Behind the Object

Astro Gallery of Gems

Family-owned since 1961, Astro Gallery of Gems began with Julio Tanjeloff’s conviction that exceptional mineral specimens belonged in homes as well as collections. The Fifth Avenue gallery in New York became a destination for collectors, designers, museums and people discovering gems and minerals for the first time. Astro specializes in fine minerals, gems, fossils, crystals, natural-history objects and rare jewelry—offerings that range from approachable specimens to large collector pieces. The gallery combines collecting, education, curation and natural history to help buyers select pieces chosen for color, formation, texture and visual presence. Compare listed dimensions, origin details and natural variations to find a specimen worth keeping in view.
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Questions About This Fossil

Helpful Answers

What will I receive?
A genuine calcified ammonite fossil of similar size, weight, and quality to the photos, approximately 246 grams and around 3.25 x 1.75 x 2.5 inches.
Is each ammonite identical?
No.
Each specimen is unique, with its own dendritic crystal patterning and iridescent, opalized tones.
Has the surface been finished?
Yes, the piece has been hand polished to reveal the spiral and shimmer.
What colors should I expect in person?
Expect neutral mineral tones with hints of vibrant yellow and an iridescent sheen that shifts in the light.
How big does it feel in a room?
It’s a compact, palmable object—substantial enough to notice on a desk or shelf without overwhelming the space.