• News
  • Gemstones
  • Birthstones
  • Jewelry
  • Lucky Gems
  • Health
  • Crypto Gems

A Unique Collection Of Blue "Rough" Gemstones

24.1KShares
322.3KViews

It's an old way to trick people into buying fakes and fake stones that look like real ones. It usually happens near mines, where inexperienced buyers think the gems come straight from the source and where buyers probably can't test the gems before buying them.

However, there are a unique collection of blue "rough" gemstones that you should consider buying.

Rough Blue Stones of Multiple Kinds

Four rough blue stones (shown in figure 1) that were said to be natural sapphires were sent to the Carlsbad laboratory for identification and origin reports. The largest one weighed 48.63 ct and was about 22.88 mm long, 19.67 mm wide, and 15.19 mm high.

This set includes a 48.63 ct piece of manmade glass (left), 9.17 and 6.21 ct laboratory-grown sapphires with resin matrix imitation on the surface (center), and an 8.46 ct natural blue sapphire rough (right) (right)
This set includes a 48.63 ct piece of manmade glass (left), 9.17 and 6.21 ct laboratory-grown sapphires with resin matrix imitation on the surface (center), and an 8.46 ct natural blue sapphire rough (right) (right)

COPYRIGHT_BER: Published on https://www.bernardine.com/a-unique-collection-of-blue-rough-gemstones/ by Barbara Mitchell on 2022-09-09T04:34:05.714Z

The material was partly shaped, and the surfaces showed lines where it had been polished. Careful examination with a microscope showed many gas bubbles, clear flow marks with a blue color, and conchoidal fractures.

Under the polariscope, weak bands that looked like snakes were seen. The specific gravity of water was 2.48. When the infrared spectrum was compared to that of man-made glass, it was confirmed that this was fake glass.

The next two stones were better copies of real sapphires. They weighed 9.17 ct and 6.21 ct, respectively, and were about 16.00 mm by 10.06 mm by 8.30 mm and 10.31 mm by 9.38 mm by 8.71 mm.

Figure 2: The resin that covered the surface looked like a natural corundum rough made of a matrix of minerals. When a hot pointer touched the resin, it began to melt. The brown stuff that was stuck in the holes looked like iron oxide stains that you might find in natural rough.

A resin imitation of matrix on the surface of a sapphire grown in a laboratory
A resin imitation of matrix on the surface of a sapphire grown in a laboratory

Even though the stones' rough surfaces made it hard to see inside, some gas bubbles could be seen through a small clear area. Raman spectroscopy showed that it was corundum, and putting it in water (figure 3) showed that it had curved blue bands.

Laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) didn't find any gallium, but it did find trace elements of impurities that are consistent with synthetic corundum. The hydrostatic specific gravity for each was 3.76 and 3.59.

Both values were lower than the SG of corundum (3.9–4.05) because the resin on the surface had a lower SG. Both were said to be sapphires made in a lab, and a note said:

Imitation matrix and resin are present on the surface.

6.21 ct laboratory-grown sapphire with curved blue banding visible in water
6.21 ct laboratory-grown sapphire with curved blue banding visible in water

The last piece of rough was a blue stone that was 13.85 x 9.89 x 7.60 mm and weighed 8.46 ct. Because the stone's natural surface was frosted, it was hard to see what was inside, but natural-looking fingerprints and strong, straight bands of inky blue were seen.

Corundum was confirmed by a hydrostatic SG of 3.96, which matched the Raman spectrum. The stone was put in methylene iodide to make sure that the lines on it were straight and not curved.

The stone had been treated with heat because it showed a medium chalky blue fluorescence to short-wave UV and a strong 3309 cm–1 series in its Fourier-transform infrared (FTIR) spectrum.

LA-ICP-MS showed natural chemistry, such as about 200 ppma of iron and trace elements like gallium (25 ppma), vanadium (3.5 ppma), magnesium (35 ppma), chromium (1.5 ppma), and titanium (80 ppma).

Based on how it looked, how its colors changed, and how it was made, this stone was said to be a natural sapphire that had been heated and that came from Madagascar.

This study was interesting because it showed how synthetics and fakes can be mixed with their natural counterparts to make a parcel look different than it really is.

Most of the time, though, a careful look and standard gemological tests are enough to tell them apart.

Share: Twitter | Facebook | Linkedin

About The Authors

Barbara Mitchell

Barbara Mitchell - Barbara is recognized by the industry leaders for her passion and objective to make beautiful jewellery accessible, affordable and forever wearable. She designs custom made jewelery made of gold and diamonds for more than 20 years. Her website, bernardine.com has been mentioned in many books such as "The 12 Gemstones of Revelation", "Teens Have Style!", "10-Minute Crystal Healing" and websites such as wikipedia.org, etsy.com, buzzfeed.com, yahoo.net.

Recent Articles

  • Garnet Meaning And Healing Properties - The Stone Of Grounding And Balance

    Gemstones

    Garnet Meaning And Healing Properties - The Stone Of Grounding And Balance

    Garnet, the birthstone of January, is more than just a pretty gemstone. Its rich history and powerful properties have made it a sought-after stone for centuries. The garnet meaning and healing properties are some of the information that people want to know about this stone.

  • Birth Crystals - Represent A Person's Period Of Birth

    Birthstones

    Birth Crystals - Represent A Person's Period Of Birth

    Most people prefer to only consider the one conventional stone that is linked with each month when they think about birth crystals, these stones are often shown next to the appropriate month in gemstone tables. There are, in fact, a few alternate birth crystals for each month.

  • Pisces Birthstone Color - For Those Born In The Month Of March

    Birthstones

    Pisces Birthstone Color - For Those Born In The Month Of March

    Humans have always recognized a deep connection between heaven and earth. It was said that during these early nights, the effect of these stars and planets greatly impacted our planet, Earth. Several myths claim that wearing the right gemstone, such as the Pisces birthstone color, may provide protection.

  • Stone September - Meaning, Benefits, History & Symbolism

    Birthstones

    Stone September - Meaning, Benefits, History & Symbolism

    The sapphire, which has been prized for thousands of years, is the birthstone for September. The word sapphire often refers to the blue variation of corundum, while ruby is the red version, however, this stone September is available in a wide range of different hues.

  • The Top 6 Free NFT Games In 2023

    NFT

    The Top 6 Free NFT Games In 2023

    NFT games are a type of digital game that use blockchain technology to create unique digital assets that can be bought, sold, and traded like physical collectables.

  • Kim Kardashian Buys Famous Princess Diana Amethyst Cross Pendant At Auction

    News

    Kim Kardashian Buys Famous Princess Diana Amethyst Cross Pendant At Auction

    Royalty has just been added to Kim Kardashian's already impressive collection of jewelry. kim kardashian buys famous princess diana amethyst cross pendant. At the annual Royal & Noble auction held by Sotheby's on Wednesday, the 42-year-old SKIMS mogul made a successful bid on the diamond-encrusted amethyst Attallah cross pendant that was most famously worn by Princess Diana.

  • Factors That Affect The Price Of Pukhraj

    Sapphire

    Factors That Affect The Price Of Pukhraj

    Pukhraj or yellow sapphire is a type of corundum that exhibits a distinctive golden colour.

  • Yellow Birthstone - The Month Of Giving Thanks

    Birthstones

    Yellow Birthstone - The Month Of Giving Thanks

    The yellow birthstone for November encourages self-expression and inspires creativity. Additionally, yellow topaz encourages focus and a profound sense of beauty. It also enables the user to reach their full potential by fusing insights gained from experience and expertise.

  • Color Of The Month - What Do They Mean?

    Birthstones

    Color Of The Month - What Do They Mean?

    A birthstone is simply a gemstone that is linked to a person's date of birth. Wearing a birthstone is said to bring luck and good health. Depending on their connection to the planets, several gemstones' color of the month is said to possess supernatural abilities. Many societies used to associate a particular gemstone with births occurring during each sign of the zodiac, but throughout time, this custom was changed to correspond with calendar months.

  • Topaz Birthstone Month - History Meaning, Color And Benefit

  • Garnet Birthstone Month - History Meaning And Benefit

  • India Diamond Traders Hit By Rupee Risks Amid Russia Supply Woes

  • Toughest Gemstones - The Unbreakable Beauty Of Diamond, Sapphire, And Ruby

  • Crystals For July - Harnessing July's Energy With Healing Crystals