Preliminary identification
Photo reference
5 uploaded photos
Overview
An eye-catching statement necklace handcrafted from natural banded green onyx (travertine/calcite) and brown banded agate. It features alternating turned cylinder and nugget beads linked on wire, culminating in a large, diagonally carved diamond-form focal pendant.
Story
Formed in mineral-rich geothermal springs over thousands of years, these banded calcite layers capture ancient geological shifts in stone, transformed by late 20th-century artisan jewelry makers into bold everyday wearable art.
Maker / Origin
While unsigned and likely produced in a studio lapidary or artisan boutique, pieces like this draw heavily on the lapidary carving traditions of Mexico and Pakistan, where deposits of banded green travertine ('Mexican onyx') have been cut and turned into decorative wares and jewelry for centuries.
Condition & Value
Appears to be in very good vintage condition with natural crystalline inclusions, subtle edge irregularities inherent to carved soft stone, and minor tarnish on the metal clasp components. Condition is typical for its age and does not detract from value.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
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Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.