Zvi Yehuda (scientist)

Zvi Yehuda

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Born| 1937

Israel

Nationality| Israeli
Citizenship| Israel
Occupation|

* Scientist
* Pioneer

Years active| 1953–present

Zvi Yehuda (born 1937) is an Israeli scientist and pioneer in the diamond industry.

## Biography[edit]

Zvi Yehuda joined the diamond industry in 1953. He worked with his father, Ben Zion, who had opened a diamond cleaving school in one of the rooms of their Tel Aviv home. Zvi Yehuda introduced his first pioneering innovation at 16 years old. He discovered a way to recycle used diamond powder created from cutting and bruting diamonds.[1] He would clean the used diamond powder and sell it back to diamond cutters to use for polishing. After demonstrating his technique to Israel's Industry Minister, he was assigned a factory for recycling diamond powder by the government which he ran for the next three years, before opening his own business with his father.[2]

In 1960, at the age of 23, Yehuda introduced the first set of digital scales for diamonds, adapting scales from grams to carats and selling them to factories.[1]

Zvi Yehuda became the first to use laser drilling on diamonds in 1965. He utilized the laser to drill into a diamond containing an Diamond flaw spot imperfection (black piques) in order to clean this imperfection.[3]

In 1977 Yehuda invented the Rough Diamond Colorimeter, a machine which examines rough diamonds and predicts what their color would be after polishing.[4] This machine measures five parameters: Diamond color, blue and yellow fluorescence, Diamond type and fancy yellow colors in five hues.[5]

Zvi Yehuda invented the Diamond Diamond enhancement (fracture filling) in 1982. In this process, a fracture (a visible inclusion often referred to as a “feather”) within the diamond is rendered invisible to the naked eye. This is done by inserting a microscopic amount of material which has the same refractive index as a diamond into the inclusion, using a high-pressure high temperature process.[6] "Yehuda" is now used as a generic term applied to diamonds treated in this manner.[7]

Yehuda's latest invention, The Sherlock Holmes, debuted in 2017 when he was 80 years old. The Sherlock Holmes is a lab-grown diamond detector device that detects HPHT and Synthetic diamond.[2] Although this was not the first machine of its kind, The Sherlock Holmes was tested by a third party- "project ASSURE", and was certified to detect 100% of all lab-grown diamonds.[8]

## References[edit]

1. ↑ 1.0 1.1 "Zvi Yehuda A Pioneer & Groundbreaker The Success Story Unfolds". JTM. Retrieved 3 February 2021.
2. ↑ 2.0 2.1 Meirovich, Leah. "The industry's Idea Man". Diamonds.net. Rapaport Magazine. Retrieved 3 February 2021.
3. ↑ Alan, Richard. "More Enhanced Diamonds & Gemstones". Costal Breeze News. Retrieved 3 February 2021.
4. ↑ Even-Zohar, Chaim. "Antwerp Lab Discovers and Reverses Undisclosed Temporary Color: IGI's Findings Alarmingly Similar to Fraudulent Treatments Exposed by GIA". IDEX. Retrieved 3 February 2021.
5. ↑ Hortman, Iris. "TZVI YEHUDA COMPANY HELD A TRAINING SESSION ON DIAMOND COLOR MEASUREMENTS". Israeli Diamond. Retrieved 3 February 2021.
6. ↑ Koivula, J; Kammerling, R; Fritsch, E; Fryer, C; Hargett, D; Kane, R (Summer 1989). "THE CHARACTERISTICS AND IDENTIFICATION OF FILLED DIAMONDS" (PDF). Gems&Gemology. 25: 68–83. Retrieved 3 February 2021.
7. ↑ Kammerling, R; Koivula, A; Kane, R; Maddison, P; Shigley, J; Fritsch, E (Summer 1991). "Fracture Filling of Emeralds" (PDF). Gems&Gemology. Retrieved 3 February 2021.
8. ↑ Bates, Rob. "Lab-Grown Diamond Detectors Put to the Test". JCK. Retrieved 3 February 2021.

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