5.24 CTS CERTIFIED RARE COLLECTOR GEM - BASTNASITE [BSBr4]

Item Information

Dimensions (mm) 10.2 x 8.5 x 4.95mm
Weight (carats) 5.24 carats
Colors
Certified Gemstone

BASTNASITE

Within the last few years, the locality at Zagi Mountain in Pakistan has provided collectors with some of the finest quality and amazingly gemmy Bastnasite specimens.  Typically the species forms in relatively thin blades and was never suitable enough for cutting stones. The new find in Pakistan has produced some very thick crystals for the species, many of which are of gem quality. The stones cut from some of these crystals are extremely rare and highly prized by collectors. They often have some sort of inclusions, and completely eye clean gems are very hard to find. This particular stone is a beautiful, golden orange color gem with a great cut. The stone is only very very slightly included, which is quite impressive for a stone this size. This stone would fill a spot in any rare gem collection, and it appears that the locality might be dwindling as less and less Bastnsite comes out each year.

Mohs scale 4 to 4.5

Grading VS

weight 5.24 cts app

size 10.20 x 8.50 x 4.95 mm app

Bastnäsite gets its name from its type locality, the Bastnäs Mine, Riddarhyttan, Västmanland, Sweden. Ore from the Bastnäs Mine led to the discovery of several new minerals and chemical elements by Swedish scientists such as Jöns Jakob Berzelius, Wilhelm Hisinger and Carl Gustav Mosander. Among these are the chemical elements cerium, which was described by Hisinger in 1803, and lanthanum in 1839. Hisinger, who was also the owner of the Bastnäs mine, chose to name one of the new minerals bastnäsit when it was first described by him in 1838.

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

6 mm = 1/4 inch (Approx)

2d 2h 54m 28s

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Pricing & Details

Bid Increment $1.00
Starting Bid $700.00
Auction ID 298309
Watchers 10 watching
Viewed 1,563 times
Starts 5th Dec 2016 6:02pm PST
Ends 11th Dec 2016 6:00pm PST

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