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$38.00
Current Bid
12
Bids
Closed
01/10/2024 03:57 am
12
124
6

3.65 Carats Bi Colour Tourmaline Gemstone

SKU
Dimensions (mm)
11.710 x 6.500 x 5.130mm
Weight (cts)
3.650
Type
Faceted
Colours

CategoryCyclosilicateFormula
(repeating unit)(Ca,K,Na, )(Al,Fe,Li,Mg,Mn)3(Al,Cr,Fe,V)6
(BO3)3(Si,Al,B)6O18(OH,F)4[1][2]IMA symbolTur[3]Crystal systemTrigonalCrystal classDitrigonal pyramidal (3m)
H-M symbol: (3m)Space groupR3m (no. 160)IdentificationColorMost commonly black, but can range from colorless to brown, red, orange, yellow, green, blue, violet, pink, or hues in-between. It can also be bi-colored, or even tri-colored. Rarely, it can be found as neon green or electric blue.Crystal habitParallel and elongated; acicular prisms, sometimes radiating; massive; scattered grains (in granite)CleavageIndistinctFractureUneven, small conchoidalTenacityBrittleMohs scale hardness7.0–7.5LusterVitreous, sometimes resinousStreakWhiteDiaphaneityTranslucent to opaqueSpecific gravity3.06+0.20–0.06[1]Density2.82–3.32Polish lusterVitreous[1]Optical propertiesDouble-refractive, uniaxial negative[1]Refractive indexnω = 1.635–1.675
nε = 1.610–1.650Birefringence−0.018 to −0.040; typically about −0.020 but in dark stones it may reach −0.040[1]Pleochroism

  • Typically moderate to strong[1]

  • Red: definite; dark red, light red

  • Green: strong; dark green, yellow-green

  • Brown: definite; dark brown, light brown

  • Blue: strong; dark blue, light blue

Dispersion0.017[1]UltravioletfluorescencePink stones; inert to very weak red to violet in long and short wave[1]Absorption spectraStrong narrow band at 498 nm, and almost complete absorption of red down to 640 nm in blue and green stones; red and pink stones show lines at 458 and 451 nm, as well as a broad band in the green spectrum[1]

Shipping provider Shipping to Thailand Shipping to rest of world
Standard Shipping - Tracked $18.00 / 15 days $18.00 / 23 days
Thailand
Standard Shipping - Tracked is discounted to $22.00 on orders with 2 or more items
Rest of the world
Standard Shipping - Tracked is discounted to $22.00 on orders with 2 or more items
DHL $28.00 / 8 days $28.00 / 8 days
Thailand
DHL is discounted to $38.00 on orders with 2 or more items
Rest of the world
DHL is discounted to $38.00 on orders with 2 or more items

gemstoneshunter
gemstoneshunter
Bangrak, Thailand
Verified
4650 Feedback

  • ckcmd
    ckcmd
    Positive

    Stunning fire, heavy on the red and green. Makes me happy just looking at it.

Bids History (12)
tomh1957
Purchased from this seller previously
1 month ago
$37.00
dwesthoff
Purchased from this seller previously
1 month ago
Automated Bid
$36.00
dwesthoff
Purchased from this seller previously
1 month ago
Automated Bid
$34.00
tomh1957
Purchased from this seller previously
1 month ago
$33.00
dwesthoff
Purchased from this seller previously
1 month ago
Automated Bid
$27.00
tomh1957
Purchased from this seller previously
1 month ago
$26.00
dwesthoff
Purchased from this seller previously
1 month ago
Automated Bid
$20.00
tomh1957
Purchased from this seller previously
1 month ago
$19.00
dwesthoff
Purchased from this seller previously
1 month ago
$13.00
rockerhip
Purchased from this seller previously
1 month ago
$12.00
tomh1957
Purchased from this seller previously
1 month ago
Automated Bid
$11.00
tomh1957
Purchased from this seller previously
1 month ago
$1.00

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Shipping Details

Shipping:
$18.00 23 days via Standard Shipping - Tracked
Ships from:
Thailand

Payment Options

  • paypal

Overview

Listing Type : Standard
Product ID : 2564716
Starting Bid : $1
Starts : 27th September 2024 03:57 am PDT
Ends : 1st October 2024 03:57 am PDT
* All prices are in USD