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$11.00 USD
價格

ORTHOCERAS ANCIENT FOSSIL 80 CTS [MGW1021 ]

3666
1

存貨單位
尺寸(毫米)
x x mm
重量 (cts)
Certified Gemstones
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Orthoceras

Orthoceras was a ancient mollusk that lived more than 400 million years ago. The name means straight horn, referring to the characteristic long, straight, conical shell. The preserved shell is all that remains of this ancestor of our modern-day squid.

THIS SPECIMEN IS VERY WELL POLISHED .

 

orthoceras drawing

WEIGHT: 80 CTS APP

SIZE: 61 X 19 X 10 MM APP

 

The soft body lived in the last open-ended segment at the large end of the conical shell. As the body grew and the housing segment became too small, a dividing wall, called the septa, grew to separate the old “home chamber” from the new one. The differences in the composition of these shell parts allowed for differences in fossilization so the parts can be seen.

The siphuncle is a tube that runs the entire length of the shell, through each of the chambers. This tube had two functions. Once filled with water, the nautiloid could force the water out, propelling itself backward with a kind of jet propulsion. By releasing the water and leaving air space, the tube could serve as a bouyancy device allowing the animal to rise and lower itself to different depths.

These straight shelled nautiloids ranged in size from less than a centimeter to more than 14 feet long!

AS WITH ALL OUR STOCK YOU MAY RETURN IT FOR A FULL REFUND IF NOT PLEASED PROVIVED IT IS NOT TOUCHED IN ANY WAY.    
Type 1 Gemstones
The following gemstones are typically inclusion free, even minor inclusions detract from their value.
Diamond, Amethyst, Beryls(Aquamarine,Morganite), Citrine, Smoky Quartz, topaz, Chrysoberyl, Kunzite, Tanzanite, green Tourmaline, and Blue Zircon

IF Internally flawless under extreme magnification (Very rare)
F Flawless
VVS Minute inclusions under 10x; invisible to the unaided eye
VS Minor inclusions under 10x; usually invisible to the unaided eye
SI1 Noticeable inclusions under 10x; usually visible to the unaided eye
SI2 Noticeable inclusions under 10x; usually quite visible to the unaided eye
I1 prominent- moderate affect on appearance or durability
I2 prominent - severe affect on appearance or durability
I3 prominent- severe affect on beauty, transparency or durability

Type 2 Gemstones
Gemstones that normally have small inclusions that do not detract from value.
Alexandrite, Andalusite, Iolite, Peridot, Rhodolite, Ruby, Sapphire, Spinel, Tourmaline, Garnet, Amethyst, Red Zircon, Tsavorite; Blue, Orange, Purple, Fluorite.Yellow and Parti-colored Tourmaline

F Flawless
VVS Minor inclusions under 10x; usually invisible to the unaided eye
VS Noticeable inclusions under 10x; often invisible to the unaided eye
SI1 Obvious inclusions under 10x; visible to the unaided eye
SI2 Obvious inclusions under 10x; very apparent to the unaided eye
I1 prominent - moderate affect on appearance or durability
I2 prominent - severe affect on appearance or durability
I3 prominent - severe affect on beauty, transparency or durability

 

 

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Registered Shipping訂單折扣為$9.00 2或更多商品
世界其他地區
Registered Shipping訂單折扣為$16.00 2或更多商品

sedagems
sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
:城市,國家
已驗證
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  • martin11
    martin11
    積極的

    Great thank very much, lovely pearls.

  • philsgems
    philsgems
    積極的

    Nice piece of rough. thankyou

  • philsgems
    philsgems
    積極的

    Nice stone. Thankyou

  • philsgems
    philsgems
    積極的

    Have received the rough. Nice colour. Thankyou

  • melvinp
    melvinp
    積極的

    Very nice, beautiful colors

5%
優惠券代碼 SEDADEALS
有效期至
2nd Jan 2025

審計

Gemstone Sheriff計畫允許我們的會員要求對任何產品進行審核,該審核由獨立的Gemologist人員完成,該資格人員評估商品描述和圖片的準確性。

送貨細節

船運:
$3.00 21透過Registered Shipping計算天數
發貨自:
Australia

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該賣家在Australia交易中加入了10.00%稅。

概述

列表類型 : Standard
產品編號 : 275996
開始 : 20th December 2024 01:00 am PST
* 所有價格均以:貨幣為單位