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Manuel Quiring

Beautiful huge ammonite, 17.2kg. Specimen from masagascar. A natural white fossilized enamel and perfect spiral shape making this fossil even more rare and valuable. Truly a beautiful, wonderfully preserved specimen.
Perisphinctes is an extinct cephalopod mollusc belonging to the ammonites. It lived in the Upper Jurassic (172-149 million years ago), and its fossil remains are found on all continents.
Si tratta di animali di ambiente marino, caratterizzati da una conchiglia esterna composta prevalentemente di carbonato di calcio, sotto forma di aragonite, e in parte di una sostanza organica di natura proteica (conchiolina). La conchiglia era suddivisa internamente da setti in diverse camere, di cui il mollusco occupava solo l'ultima (camera d'abitazione). Le altre, che componevano il fragmocono (parte concamerata della conchiglia), erano utilizzate come "camere d'aria" (analogamente all'attuale Nautilus), riempite di gas e liquido camerale per controllare il galleggiamento dell'organismo. La pressione dei fluidi camerali era controllata da una sottile struttura organica tubolare riccamente vascolarizzata, in parte mineralizzata (il sifone), che attraversava tutti i setti e permetteva lo scambio di fluidi dal sangue e dai tessuti molli dell'animale alle camere tramite un processo di osmosi.

Jurassic (201.3 - 145 million years) - Madagascar

Large Ammonite - Fossilised shell - Perisphinctid

Gemstones

Reserve price

No reserve price

Closing date

today

tomorrow

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Location

Thailand

Italy

Spain

The Netherlands

Germany

Japan

Singapore

India

Poland

Portugal

Austria

Czech Republic

Canary Islands

Luxembourg

Norway

Object

Faceted gemstone

Country of origin

No origin given

Brazil

Stone

Sapphire

Emerald

Tanzanite

Topaz

Aquamarine

Opal

Spinel

Tourmaline

Ruby

Citrine

Amethyst

Garnet

Tsavorite

Kunzite

Fluorite

Peridot

Spodumene

Zircon

Alexandrite

Tourmaline paraiba

Rhodolite

Hessonite

Quartz

Sapphire padparadscha

Beryl

Certification

International Colored Gemstone Association (ICA GemLab)

Antwerp Laboratory for Gemstone Testing (ALGT)

International Gemological Institute (IGI)

Gem Report Antwerp (GRA)

Instituto Gemólogico Español (IGE)

Lotus Gemology

Bellerophon Gemlab

Colour

Blue

Orange

Yellow

Brown

Bi-colour

Pink

Oval

Mixed cut

Pear

Cushion

Modified brilliant cut

Octagon

Step cut

Triangle

Modified cut

Emerald cut

Faceted cut

Round

Heart

Fancy

Rectangle

Brilliant cut

Fantasy

Clarity

Eye clean

Loupe clean

Slight

Moderate

Treatment

Commonly irradiated with no evidence of treatment

Commonly heated with no evidence of treatment

Not specified in the report

No evidence of treatment

Heat treatment

Irradiation

No heat treatment

Gemstone transparency

Transparent

Pearl luster

Excellent

Very good

Good

Optical effect (gemstones)

Fluorescence

Heat treatment-  Lab report: TH26G116263

No reserve price - 1 pcs  Blue Topaz  - 28.76 ct - International Colored Gemstone Association (ICA GemLab) - AMAZING LUSTER BLUE TOPAZ

Not specified in the report-  Lab report: 78493731

No reserve price Topaz  - 19.82 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Intense Brownish Orange

Not specified in the report-  Lab report: 74272020

No reserve price - 1 pcs  Brown Topaz  - 22.04 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Intense Orangy Brown

Not specified in the report-  Lab report: 59297984

No reserve price Topaz  - 20.03 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Sky Blue Topaz

Commonly irradiated with no evidence of treatment, Commonly heated with no evidence of treatment-  Lab report: GRA-1830016 971AN

No reserve price Topaz  - 76.42 ct - Gem Report Antwerp (GRA) - Intense 'Swiss' Blue

Not specified in the report-  Lab report: TH25G117413

Blue Topaz  - 80.55 ct - International Colored Gemstone Association (ICA GemLab) - Swiss Blue

Commonly heated with no evidence of treatment, Commonly irradiated with no evidence of treatment-  Lab report: TH26G118627

No reserve price - 1 pcs  Blue Topaz  - 32.78 ct - International Colored Gemstone Association (ICA GemLab)

No origin given - Not specified in the report-  Lab report: TH26G118726

No reserve price - 1 pcs  Blue Topaz  - 61.55 ct - International Colored Gemstone Association (ICA GemLab)

Commonly irradiated with no evidence of treatment, Commonly heated with no evidence of treatment-  Lab report: 36633139

No reserve price - 1 pcs  Blue Topaz  - 21.76 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

Irradiation-  Lab report: 1830014701 AN

No reserve price - 1 pcs  Blue Topaz  - 61.21 ct - Gem Report Antwerp (GRA) - Swiss Blue topaz

Commonly irradiated with no evidence of treatment-  Lab report: 769623641

No reserve price - 1 pcs  Blue Topaz  - 14.02 ct - International Gemological Institute (IGI)

Commonly heated with no evidence of treatment, Commonly irradiated with no evidence of treatment-  Lab report: TH26G118583

No reserve price - 1 pcs  Blue Topaz  - 38.61 ct - International Colored Gemstone Association (ICA GemLab) - "London Topaz"

Commonly irradiated with no evidence of treatment, Commonly heated with no evidence of treatment-  Lab report: 22426725

No reserve price - 2 pcs  Blue Topaz  - 29.15 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

Heat treatment, Irradiation-  Lab report: 788632359

No reserve price Blue Topaz  - 26.13 ct - International Gemological Institute (IGI)

Commonly irradiated with no evidence of treatment, Commonly heated with no evidence of treatment-  Lab report: GRA-1830016 874AN

No reserve price Topaz  - 47.38 ct - Gem Report Antwerp (GRA) - Intense 'Swiss' Blue

Commonly heated with no evidence of treatment, Commonly irradiated with no evidence of treatment-  Lab report: TH26G117607

No reserve price - 1 pcs  Yellow, Orange Topaz  - 40.37 ct - International Colored Gemstone Association (ICA GemLab)

No origin given - No evidence of treatment-  Lab report: 772694341

No reserve price - 1 pcs  Orange Topaz  - 18.97 ct - International Gemological Institute (IGI)

Not specified in the report-  Lab report: 772694331

No reserve price - 1 pcs  Brown, Orange Topaz  - 31.44 ct - International Gemological Institute (IGI)

Not specified in the report-  Lab report: 92101634

No reserve price Topaz  - 32.82 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Sky Blue Topaz

Commonly heated with no evidence of treatment, Commonly irradiated with no evidence of treatment-  Lab report: TH26G118549

1 pcs  Blue Topaz  - 105.77 ct - International Colored Gemstone Association (ICA GemLab) - "Millenium Cut Topaz"

Commonly irradiated with no evidence of treatment-  Lab report: D-63346

Blue Topaz  - 31.26 ct - Instituto Gemólogico Español (IGE)

Commonly irradiated with no evidence of treatment-  Lab report: 38188782

1 pcs  Blue Topaz  - 40.08 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Swiss Blue

Commonly irradiated with no evidence of treatment, Commonly heated with no evidence of treatment-  Lab report: GRA-1830015 419AN

No reserve price Topaz  - 34.15 ct - Gem Report Antwerp (GRA) - 'Swiss' Intense Blue

Heat treatment-  Lab report: 773638271

No reserve price - 1 pcs  Blue Topaz  - 37.48 ct - International Gemological Institute (IGI)

Gemstones

This object is no longer available, but there’s still lots to explore

Large Ammonite - Fossilised shell - Perisphinctid

117 objects

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