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Grandidierite, 7.25ct, big gemstone born in Madagascar!
- SKU
- Dip5
- Afmetingen (mm)
- 15.100 x 10.800 x 6.800mm
- Gewicht (cts)
- 7.250
- Treatment
- No Treatment
- Shape
- Oval
- Type
- Faceted
- Clarity
- SI
- Kleuren
-
Grandidierite is a mineral that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.
A rather rare mineral, blue-green grandidierite is seldom seen in gem or jewelry collections. Translucent material is sometimes cut into cabochons. Faceted pieces are rare. As cabochons, translucent grandidierite can range from 1 to 10 carats and up to about one inch in size. Most material is generally opaque.[citation needed]
Since its discovery in 1902, most grandidierite used as a gem has been translucent. Recent discoveries of transparent material in Sri Lanka (around 2000) and a new deposit in Madagascar (2014) have resulted in faceted gemstones.
Grandidierites appear bluer in color the more iron (Fe) they contain. A recently discovered gemstone, blue ominelite is the Fe-analogue (Fe, Mg) to grandidierite (Mg, Fe).
Grandidierites display strong trichroic pleochroism. That means they can show three different colors depending on the viewing angle: dark blue-green, colorless (sometimes a very light yellow), or dark green.
While trichroism can usually help distinguish grandidierites from other gems, lazulites can occur with blue-green colors and show colorless/blue/dark blue pleochroism. They also appear cabbed and, more rarely, faceted. Nevertheless, lazulites have somewhat higher refractive indices and specific gravity. Grandidierites also have greater hardness.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use: Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible.
Please pay your stones in between 48 hours or contact me. Otherwise I need to cancel the deal.
If there is anything you shouldn't be satisfied with please just let me now and we will find a way to solve every problem. My aim is to make you happy with beautiful stones of good quality, good communication is the easiest way to find a solution!
- SKU
- Dip5
- Afmetingen (mm)
- 15.100 x 10.800 x 6.800 mm
- Gewicht (cts)
- 7.250
- Treatment
- No Treatment
- Shape
- Oval
- Type
- Faceted
- Clarity
- SI
- Kleuren
-
Grandidierite is a mineral that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.
A rather rare mineral, blue-green grandidierite is seldom seen in gem or jewelry collections. Translucent material is sometimes cut into cabochons. Faceted pieces are rare. As cabochons, translucent grandidierite can range from 1 to 10 carats and up to about one inch in size. Most material is generally opaque.[citation needed]
Since its discovery in 1902, most grandidierite used as a gem has been translucent. Recent discoveries of transparent material in Sri Lanka (around 2000) and a new deposit in Madagascar (2014) have resulted in faceted gemstones.
Grandidierites appear bluer in color the more iron (Fe) they contain. A recently discovered gemstone, blue ominelite is the Fe-analogue (Fe, Mg) to grandidierite (Mg, Fe).
Grandidierites display strong trichroic pleochroism. That means they can show three different colors depending on the viewing angle: dark blue-green, colorless (sometimes a very light yellow), or dark green.
While trichroism can usually help distinguish grandidierites from other gems, lazulites can occur with blue-green colors and show colorless/blue/dark blue pleochroism. They also appear cabbed and, more rarely, faceted. Nevertheless, lazulites have somewhat higher refractive indices and specific gravity. Grandidierites also have greater hardness.
Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use: Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible.
Please pay your stones in between 48 hours or contact me. Otherwise I need to cancel the deal.
If there is anything you shouldn't be satisfied with please just let me now and we will find a way to solve every problem. My aim is to make you happy with beautiful stones of good quality, good communication is the easiest way to find a solution!
Verzend provider | Verzending naar Austria | Verzending naar de rest van de wereld |
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Standard Shipping - Tracked | $12.00 / 3 | $16.00 / 21 |
Austria
Standard Shipping - Tracked krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
Rest van de wereld
Standard Shipping - Tracked krijgt korting op $17.00 bij bestellingen met 3 of meer artikelen
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FedEx | $27.00 / 2 | $46.00 / 5 |
Austria
FedEx krijgt korting op $26.00 bij bestellingen met 2 of meer artikelen
Rest van de wereld
FedEx krijgt korting op $45.00 bij bestellingen met 2 of meer artikelen
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Express Shipping | $36.00 / 2 | $75.00 / 5 |
Austria
Express Shipping krijgt korting op $40.00 bij bestellingen met 3 of meer artikelen
Rest van de wereld
Express Shipping krijgt korting op $65.00 bij bestellingen met 3 of meer artikelen
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Registered Shipping | $9.00 / 7 | $16.00 / 21 |
Austria
Registered Shipping krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
Rest van de wereld
Registered Shipping krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
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Standard Shipping - Untracked | $5.00 / 3 | $13.00 / 28 |
Austria
Standard Shipping - Untracked krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
Rest van de wereld
Standard Shipping - Untracked krijgt korting op $13.00 bij bestellingen met 3 of meer artikelen
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Positief
Paid and shipped - no feedback left after 100 days
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Positief
An exquisite gem and very clean. It arrived promptly too. Thank you.
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Positief
Received, thank you
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Positief
This gem arrived in a reasonable time, and it is absolutely spectacular. It looked exactly like the photos and the cut was just perfect. I will certainly do business with stonehengejpd in the future.
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Positief
Received, thank you
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Positief
Beautiful, arrived exactly as described. Very happy with purchase.
Waarom overbieden gebruikers zichzelf?
Wanneer een bod wordt geplaatst, is dit het maximale bedrag dat een persoon bereid is te bieden voor het product. Ons systeem zal dan automatisch bieden namens de bieder, waarbij het bod stapsgewijs wordt verhoogd tot het maximum om hun positie als hoogste bieder te behouden.
Wanneer er een pictogram is dat 'Automatisch bod' aangeeft, betekent dit dat ons systeem actief biedingen plaatst voor de bieder op basis van hun maximale bod. Dit kan lijken alsof bieders zichzelf overbieden, maar het is gewoon een resultaat van het systeem dat het bod bijwerkt om de maximale limiet van de bieder weer te geven.
Audit
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Beschrijving Nauwkeurig
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Foto's Nauwkeurig
Comments
The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.