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4.34 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.3mm, 4XM: This striking 4.34-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dramatic banded ironstone matrix with layered hues of deep plum, warm terracotta, and golden ochr

2 days Left

4.34 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.3mm, 4XM

Est. $60-$120

Robert Bénard (1734–1777) – Stratigraphy and Angles of Slate Extraction in Anjou – Engraving: "Ardoiseries d'Anjou." This eighteenth-century engraving illustrates the geological and geometric principles of slate mining in the Anjou region, featuring a main cross-section of a deep extraction sh

6 days Left

Robert Bénard (1734–1777) – Stratigraphy and Angles of Slate Extraction in Anjou – Engraving

Proverde Auctions

Est. $50-$100

Polished Michigan Petoskey Stone: This specimen is a polished Petoskey stone, which is a fossilized rugose coral of the species Hexagonaria percarinata. Originating from the Great Lakes region of Michigan, the stone features a kidney-

Apr 09, 2026

Polished Michigan Petoskey Stone

Kellie's Estate Sales

Est. $30-$50

7.238 Carats Violet and Yellow Ametrine - Natural Brazilian Gemstone, LZ275: This impressive octagon step-cut ametrine showcases a striking, well-defined fusion of deep violet and warm golden-yellow hues, a hallmark of this dual-colored quartz. The step-cut faceting enhances t

2 days Left

7.238 Carats Violet and Yellow Ametrine - Natural Brazilian Gemstone, LZ275

Est. $100-$200

3.08 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.3mm, 2XM: This captivating 3.08-carat Koroit boulder opal cabochon is a natural work of geological art, featuring delicate, scattered veins of vivid green, blue, and iridescent play-of-color that glow against a

2 days Left

3.08 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.3mm, 2XM

Est. $60-$120

5.01 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.2x9.6mm, 8XM: This exceptional 5.01-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring striking patches of milky blue opal infused with vivid iridescent play-of-color, set against a r

2 days Left

5.01 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.2x9.6mm, 8XM

Est. $60-$120

A Chinese Nephrite Jade Landscape Plaque, 20th Century, 81FC: Carved from pale celadon to grey-green nephrite jade with subtle tonal variation and minor natural inclusions, the object is worked as a vertically oriented plaque with a gently curved upper edge. The

2 days Left

A Chinese Nephrite Jade Landscape Plaque, 20th Century, 81FC

Est. $40-$80

James E DeKay - Plate LXXXVI The Semipalmated Sandpiper and The Long-legged Sandpiper 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay - Plate LXXXVI The Semipalmated Sandpiper and The Long-legged Sandpiper 1844

Britannica Auctions Ltd

Est. £20-£40

Albert de Grossouvre (1849-1932) – Ammonite Fossil – Lithograph (1894): "Plate 28." The illustration displays a monochromatic rendering of a fossilized ammonite, highlighting the intricate spiral structure and ribbed surface of the shell. This lithograph serves as a scien

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Albert de Grossouvre (1849-1932) – Ammonite Fossil – Lithograph (1894)

Dahlstroms Auctioneer

Natural Opal Quartz Heart Restored Mineral Specimen: Natural Opal Quartz Heart Restored Mineral Specimen Weighing 56 grams this heart-shaped specimen features natural opal quartz with delicate translucence and subtle flashes of opalescence. Carefully r

4 days Left

Natural Opal Quartz Heart Restored Mineral Specimen

Weatherham Estate Treasures

Est. $120-$240

Athanasius Kircher (1602-1680) – Hydraulic Machines and Pneumatic Experiments – Engraving: "Liber Quintus" features technical engravings of complex mechanical systems, including a dual-bellows hydraulic pump and a pneumatic experiment demonstrating the pressure of air on water. This page is

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Athanasius Kircher (1602-1680) – Hydraulic Machines and Pneumatic Experiments – Engraving

Dahlstroms Auctioneer

Albert de Grossouvre (1849-1932) - Ammonite Fossil - Lithograph (1894): The illustration depicts a detailed monochrome rendering of an ammonite fossil, highlighting the intricate spiral structure and ribbed exterior of the shell. This lithograph serves as a scientific doc

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Albert de Grossouvre (1849-1932) - Ammonite Fossil - Lithograph (1894)

Dahlstroms Auctioneer

Natural Agate Crystal Cave with Quartz Crystal Interior: Natural Agate Crystal Cave with Quartz Crystal Interior This 60 gram natural agate crystal cave reveals a striking quartz crystal interior, showcasing shimmering points nestled within a smooth, bande

4 days Left

Natural Agate Crystal Cave with Quartz Crystal Interior

Weatherham Estate Treasures

Est. $110-$220

Athanasius Kircher (1602-1680) – Hydraulic Experiment: Subterranean Fountains – Engraving: "Liber Quintus, Modus VI" illustrates a complex hydraulic mechanism designed to explain the movement of subterranean water and the formation of springs within mountains. This woodcut engraving origina

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Athanasius Kircher (1602-1680) – Hydraulic Experiment: Subterranean Fountains – Engraving

Dahlstroms Auctioneer

Athanasius Kircher (1602-1680) – Meteorological Studies: Origin of Winds – Engraving (1680): "De Ventorum Origine" illustrates various experimental and natural phenomena used to explain the movement of air and the formation of storms, including a diagram of a flask and a topographical view of

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Athanasius Kircher (1602-1680) – Meteorological Studies: Origin of Winds – Engraving (1680)

Dahlstroms Auctioneer

James E DeKay - Plate LIV The Carolina Tit, The Mourning Warbler and The Yellow-throat 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay - Plate LIV The Carolina Tit, The Mourning Warbler and The Yellow-throat 1844

Britannica Auctions Ltd

Est. £20-£40

James E DeKay - Plate IX The Hawk Owl and The Snow Owl 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay - Plate IX The Hawk Owl and The Snow Owl 1844

Britannica Auctions Ltd

Est. £20-£40

A Chinese Carved Jadeite Jade Bangle Bracelet, 20th Century, 51ZL: A fine jadeite bangle of flattened circular form, intricately carved in relief with a continuous band of foliate and floral motifs. The stone displays a captivating variegated palette, featuring a cre

2 days Left

A Chinese Carved Jadeite Jade Bangle Bracelet, 20th Century, 51ZL

Est. $60-$120

DECORATIVE FOSSIL STONE SPHERE ON METAL STAND: POLISHED FOSSIL STONE SPHERE DISPLAYED ON BLACK METAL DECORATIVE STAND Decorative polished fossil stone sphere featuring dense natural fossil inclusions and organic patterning in charcoal, taupe, and

19 hrs Left

DECORATIVE FOSSIL STONE SPHERE ON METAL STAND

DejaVu Estate Sales & Auctions, LLC

Est. $30-$60

James E DeKay - Plate CII The American Avoset, The Marlin and The American Avoset 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay - Plate CII The American Avoset, The Marlin and The American Avoset 1844

Britannica Auctions Ltd

Est. £20-£40

A Chinese Carved Jadeite Jade Bangle Bracelet, 20th Century, 53ZL: A fine jadeite bangle of flattened circular form, intricately carved in relief with a continuous band of foliate and floral motifs. The stone displays a captivating variegated palette, featuring a pal

2 days Left

A Chinese Carved Jadeite Jade Bangle Bracelet, 20th Century, 53ZL

Est. $60-$120

James E DeKay -Plate LVIII The Black-throated Blue Warbler, The Cape-May Warbler and The Nashville: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay -Plate LVIII The Black-throated Blue Warbler, The Cape-May Warbler and The Nashville

Britannica Auctions Ltd

Est. £20-£40

38.40 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 45XP: This substantial Winton boulder opal rough slab showcases a captivating patchwork of ethereal sky-blue, aqua-green, and soft lavender play-of-color, embedded within its natural ironstone host rock. Me

2 days Left

38.40 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 45XP

Est. $80-$160

James E DeKay - Plate XXXV The Solitary Greenlet and The Yellow-throated Greenlet 1844: This original and striking 19th century engraving, drawn mostly from living specimens, have been superbly hand painted by professional colourists.James E. DeKay (1792 ? 1851) was an American zoologist

4 days Left

James E DeKay - Plate XXXV The Solitary Greenlet and The Yellow-throated Greenlet 1844

Britannica Auctions Ltd

Est. £20-£40

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