A subduction zone, which starting at about 410 kilometers below the earthโs surface is the depth at which it believed blue diamonds began forming.
You are cordially invited to join us at Gemgenevรฉ Show 2024: Boot: D-30.
M.I.D. Specializes in: All shapes and sizes from 0.30ct to extreme sized diamonds of 10.00+ct; Parcels, single stones, matched pairs, and layouts Certified stock fromย GIA, EGL, AGS, HRD, and IGI Extremely Rare Fancy Colored Specialty Stones Premium cuts to value cuts in all shapes Fancy colored diamonds available in one-of-a-kind jewelry.
The Hong Kong Jewellery & Gem Fair is considered is amongst Asiaโs top 3 fine jewellery events and is a must attend trading event. In June 2019 31stย Hong Kong Jewellery & Gem Fair will take place at the Hong Kong convention and exhibition center and host 2,300 exhibitors from over 40 countries around the world.
MID House of Diamonds will be present and exhibiting at the September 2023 Hong Kong Jewellery & Gem Fair. Join Us! Booth: D -30
MID House of Diamonds will be among the exhibitors at the June 2020 JCK Vegas Show. Come say Hi!
Lorem ipsum dolor sit amet conse ctetur adipisicing elit.
Ipsum dolor sit amet conse ctetur adipisicing elit, sed do eiusmod tempor incididunt.
Dolor sit amet conse ctetur adipisicing elit, sed do eiusmod tempor.
580 5th Ave #3003, New York, NY 10036
+1-212-391-1121
+1-877-391-1121
Blog
Home ยป Blog – The Diamond Blog ยป CONTINENTAL DRIFT REVEALS THE SECRETS OF THE ORIGIN OF BLUE DIAMONDS
Focus on
Where two tectonic plates meet are called subduction zones. There, one layer slides beneath the other back into the earthโs mantle, releasing energy in the form of molten rock or lava that flows from deep underground to the surface, giving rise to volcanic activity.
Geologists believe that natural diamonds were formed from carbon deposits that were subject to extreme pressures and temperatures as they were dragged through tectonic movement into the earthโs mantle. Consequently, they were delivered to the surface by deep-source volcanic eruptions, producing the kimberlite and lamproite ore pipes that are mined today.
It now appears that not only are diamonds the result of a tectonic action, but so is the color of fancy-color diamonds, or at the very least blue fancy-color diamonds, according to an article just published by a group of researchers in theย Natureย periodical, entitled โDeep Blue,โ whose lead author was Evan Smith, a scientist at the Gemological Institute of America (GIA).
BLUE DIAMONDS FORMED AT THREE TIMES THE DEPTHS OF OTHERS
The source of the color in blue diamonds are boron atoms, embedded in the crystal structure of rare Type IIb diamonds. The article inย Natureย reveals they are โsuperdeepโ diamonds, which means that they crystallized considerably deeper below the earth than most other gem diamonds.
To reach their findings, the scientists studied mineral inclusions trapped in the crystal structures of 46 Type IIb diamonds, ย concluding that they are only are found together when the diamond had been subject to especially high pressures, such as those that existing in subduction transition zones, starting at 410 kilometers beneath the earthโs surface, reaching into the lower mantle, at a depth of 660 kilometers beneath the earthโs surface.
In comparison most other kinds of diamonds are believed to have been formed the base of old continents, at depths of about 150 kilometers to 200 kilometers.
A subduction zone, which starting at about 410 kilometers below the earthโs surface is the depth at which it believed blue diamonds began forming.
A PRODUCT OF EARTH AS IT WAS MILLIONS OF YEARS BACK
What puzzled the scientists is that, ordinarily, the concentration of boron in the earthโs mantle is extremely low, whereas higher concentrations, such as those existing at the earthโs surface, would be required to result in the boron atoms presence in Type IIb diamonds.
What the researchers now believe is that the boron may have originally been derived from ancient waterbodies, separating the continents as they once existed, which over time was deposited in the ocean crust that eventually was carried down to the lower mantle during the process of subduction. At that stage the increased temperature and pressure broke down the deposited minerals, which released a boron-enriched fluid which triggered diamond growth.
โMost previous studies of super-deep diamonds had been carried out on diamonds of low quality,โ explained Steven Shirey of the Carnegie Institute, one of the scientists involved in the study. โBut between our 2016 finding that the worldโs biggest and most-valuable colorless diamonds formed from metallic liquid deep inside Earthโs mantle and this new discovery that blue diamonds also have super-deep origins, we now know that the finest gem-quality diamonds come from the farthest down in our planet.โ
The August 2018 Nature magazine, where the cover story tackles the subject of origin in blue diamonds.