4.56 ct Valuable Fancy (17 x 10 mm) Multi Color Australian Koroit Boulder Opal

Description

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4.56 ct Valuable Fancy Shape (17 x 10 mm) Multi Color Australian Koroit Boulder Opal Natural Loose Gemstone
Rare Stone! Unheated / Untreated Multi Color Orgin From Australia
100% Natural Genuine & Mined from Earth Gemstone !!!
Gem Type
Boulder Opal
Color
Multi Color
Shape
Fancy
Size (LxWxD)
17.15 x 9.89 x 4.09 mm
Weight
4.56 ct
Hardness
6.5
Luster
Excellent
Clarity
Opaque
Treatment
Unheated / Untreated
Origin
Australia
RefractiveIndex
1.37-1.47
Specific Gravity
2.1
FL
IF
VVS1
VVS2
VS1
VS2
SI1
SI2
L1
L2
L3
L4
Flawless Internally
Flawless
Very Very Slightly
Imperfect
Very Slightly Imperfect
Slightly Imperfect
Imperfect
Opaque
Boulder Opal
Mohs Hardness: 5.5-6.5 Found in Australia History: Opal is a semi-transparent solidified mineral composed of silicon and water. Boulder opal refers to a clear water opal with brilliant color play and a distinctive dark chocolate brown ironstone matrix. This opal was formed when silica-bearing steam was forced into cracks in ironstone boulders and then mineralized. The name opal is derived from the Latin opalus and Sanskrit upala meaning “precious stone”. The Greek term opallios translates "to see a change in color". The oldest known opal mine is in Czechoslovakia and dates to 14th century. Popularity of opal suffered in 19th century partially due to Sir Walter Scott's novel of a cursed stone and was thought to be bad luck. Queen Victoria promoted the stone in 1800s by giving opal jewelry to her children. In the middle ages, the stone was thought to make the wearer invisible, and was highly recommended to thieves. Today, Australia is major source for opal and supplies abt 85% of the world’s opal. It is a rather soft stone and needs care with handling. Do not immerse in hot water or a sonic cleaner. Opal is graded by size/cut/rarity/base color/fire color/fire intensity/fire pattern and fire consistency. Metaphysical: said to assist in recalling past incarnations, to develop psychic powers,bring out inner beauty, and draw money and luck
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