GradingOct 21, 2022
Why AGS Is Closing Its Lab, Merging It With GIA GradingOct 26, 2022
SSEF Introduces Automated Diamond Screener for Very Small Melee
Created with Swiss robotics company Unimec, the ASDI-500 can screen stones as small as 0.5 mm at a speed of 700 stones per hour.
The ASDI-500, developed by SSEF and Unimec, can screen stones as small as 0.5 mm at a speed of 700 stones per hour. It will be unveiled at GemGenève International Gem & Jewellery Show in November.
Basel, Switzerland—The Swiss Gemmological Institute SSEF and Swiss robotics company Unimec have released a new version of the Automated Diamond Spectral Inspection (ASDI) device that can screen diamonds as small as 0.5 mm in diameter.
First launched eight years ago, SSEF developed the ASDI to protect the Swiss watch and jewelry industry, a major consumer of melee diamonds, from undisclosed lab-grown diamonds and simulants.
It was the first device to automatically screen large batches of colorless diamonds, SSEF said.
Still, there was no automated solution for the authentication of very small melee, and SSEF and UNIMEC responded by developing the ASDI-500, which can screen large quantities of round colorless polished diamond melee to detect synthetics and simulants.
The new ASDI-500 can analyze diamonds ranging from 0.50 to 3.80 mm in diameter at an average sorting speed of 700 stones per hour.
Unimec made this possible by integrating within the instrument its fast pick-and-place robot, which has a positioning precision of 5 microns, or 0.005 mm.
The ASDI-500 can detect both HPHT and CVD grown diamonds as well as diamond simulants.
“The ASDI-500 is the first-ever automatic machine to fill the gap between approximately 0.50 mm and 1.00 mm,” said Jean-Pierre Chalain, director of SSEF’s diamond department. “To an uninformed person, this gap may seem insignificant, but traders and consumers of melee know that it represents millions of diamonds per month.”
The ASDI-500 will be unveiled at the GemGenève International Gem & Jewellery Show, slated for Nov. 3-6 at Palexpo in Geneva.
Interested parties can reach out to SSEF for a viewing of the instrument.
The cost of the machine will be announced at the trade show.
The ASDI-500 is being manufactured and commercialized by UNIMEC SA. For more information, contact marketing@unimecsa.ch.
Related stories will be right here …
First launched eight years ago, SSEF developed the ASDI to protect the Swiss watch and jewelry industry, a major consumer of melee diamonds, from undisclosed lab-grown diamonds and simulants.
It was the first device to automatically screen large batches of colorless diamonds, SSEF said.
Still, there was no automated solution for the authentication of very small melee, and SSEF and UNIMEC responded by developing the ASDI-500, which can screen large quantities of round colorless polished diamond melee to detect synthetics and simulants.
The new ASDI-500 can analyze diamonds ranging from 0.50 to 3.80 mm in diameter at an average sorting speed of 700 stones per hour.
Unimec made this possible by integrating within the instrument its fast pick-and-place robot, which has a positioning precision of 5 microns, or 0.005 mm.
The ASDI-500 can detect both HPHT and CVD grown diamonds as well as diamond simulants.
“The ASDI-500 is the first-ever automatic machine to fill the gap between approximately 0.50 mm and 1.00 mm,” said Jean-Pierre Chalain, director of SSEF’s diamond department. “To an uninformed person, this gap may seem insignificant, but traders and consumers of melee know that it represents millions of diamonds per month.”
The ASDI-500 will be unveiled at the GemGenève International Gem & Jewellery Show, slated for Nov. 3-6 at Palexpo in Geneva.
Interested parties can reach out to SSEF for a viewing of the instrument.
The cost of the machine will be announced at the trade show.
The ASDI-500 is being manufactured and commercialized by UNIMEC SA. For more information, contact marketing@unimecsa.ch.
Editors' Picks
Sponsored by
More on Grading
The Latest
Supplier BulletinJan 22, 2026
The Rise of Centralized Sourcing in the Colored Gemstone MarketSponsored by RapNet
MajorsJan 22, 2026
Lugano Diamonds Finds a BuyerInvestment firm Enhanced Retail Funding, a division of Gordon Brothers, was the successful bidder.
SourcingJan 22, 2026
De Beers To Release ‘A Diamond Is Forever’ BookIt explores the history of the iconic tagline and the company’s strategy to redefine the role of diamonds in society.
Brought to you by
How Jewelers Can Fight Back Against Cell JammersCriminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.
MajorsJan 22, 2026
Swarovski Appoints New North America PresidentRetail veteran Sindhu Culas has stepped into the role.
Weekly QuizJan 22, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
MajorsJan 22, 2026
Stuller Names New Chief Merchandising, Marketing, Sales OfficerTaylor Burgess, who has been at Stuller since 2013, was promoted to the newly created role.
PodcastsJan 21, 2026
Episode 1: High Gold Prices, the Diamond Dilemma, & What’s NextWas 2025 a good year for jewelers? Did lab-grown diamonds outsell natural? Find out on the first episode of the “My Next Question” podcast.
Brought to you by
Impacting Tomorrow TodayHow Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.
EditorsJan 21, 2026
6 Jewelry Designers Poised to Have a Breakout Year in 2026Whether you recognize their jewels or are just discovering them now, these designers’ talent and vision make them ones to watch this year.
SourcingJan 21, 2026
Tucson Preview 2026: Earthy Tones and Innovative Shapes Buyers are expected to gravitate toward gemstones that have a little something special, just like last year.
CrimeJan 21, 2026
4 Men Charged in $1.7M California Smash-and-Grab Jewelry Store RobberyPlus, JSA’s Scott Guginsky discusses the need for jewelers to take more precautions as the gold price continues to climb.
IndependentsJan 21, 2026
Delaware Jeweler Felice Morris Dies at 91Morris’ most cherished role was being a mother and grandmother, her family said.
CollectionsJan 21, 2026
Bulgari Weaves New Collection of ‘Vimini’ Creations“Vimini” is the first chapter of the “Bulgari Eternal” collection that merges archival pieces with modern creations.
Events & AwardsJan 21, 2026
Jewelers Mutual’s ‘Conversations’ Retreat Returns to Discuss AIThe third edition will be held in Half Moon Bay, California, in April.
Events & AwardsJan 20, 2026
These Are the 5 Finalists for the David Yurman Gem Awards GrantThe grant is in its first year and was created to recognize an exceptional fine jewelry designer whose star is on the rise.
ColumnistsJan 20, 2026
First-Party Data Is the Most Valuable Asset Jewelers Have in 2026Data built on trust, not tracking, will be key to success going forward, as the era of “borrowed attention” ends, Emmanuel Raheb writes.
MajorsJan 20, 2026
Borsheims Hires New Assistant Facilities ManagerHeath Yarges brings two decades of experience to the role.
EditorsJan 16, 2026
Remembering Pete Yantzer for His Contributions and His Kindness Pete’s boundless curiosity extended beyond diamond cut and he was always eager to share his knowledge with others, no matter the topic.
FinancialsJan 16, 2026
Richemont’s Jewelry Brands Shine in Q3Cartier, Van Cleef & Arpels, Buccellati, and Vhernier had another successful holiday season, Richemont reported this week.
TrendsJan 16, 2026
Diane Lane's Brooch Buzzes at the 2026 Golden GlobesOur Piece of the Week is Lagos’ “Bee” brooch that was seen on the red carpet for the first time on Sunday.
CrimeJan 15, 2026
D.C. Rapper ‘Taliban Glizzy’ Sentenced to 18+ Years for Jewelry Store RobberiesTrevor Jonathan Wright led a crew in a string of armed robberies targeting South Asian-owned jewelry stores on the East Coast.
Events & AwardsJan 15, 2026
Jewelers of Americas’ ‘20 Under 40’ Nominations Now OpenThe program recognizes rising professionals in the jewelry industry.
Events & AwardsJan 15, 2026
Registration for JCK Las Vegas 2026 Is Now OpenA new lifestyle section and a watch showcase have been added to this year’s event.
TrendsJan 15, 2026
Don’t Double-Dip With This Golden ChipAvocados From Mexico is celebrating those who love to double-dip in game day guacamole with a 14-karat yellow gold tortilla chip necklace.
SourcingJan 15, 2026
Nearly 42-Carat Blue Diamond Discovered in South AfricaPetra Diamonds unearthed the 41.82-carat, Type IIb blue diamond at the Cullinan Mine.
CollectionsJan 14, 2026
Marie Lichtenberg Lassos Leather for New BraceletsThe brand is trading its colorful fabric cords for Italian leather in its “Lasso” baby locket bracelets.
TechnologyJan 14, 2026
“My Next Question” Enters Its Podcast Era National Jeweler and Jewelers of America’s popular webinar series is evolving in 2026.
