FinancialsMar 19, 2026
Signet Jewelers to Close 100 Stores, Shutter James Allen BannerThe jewelry retailer announced changes to its store network and brand portfolio during its fourth-quarter earnings call.
GradingJan 05, 2021
William Hanneman, a Gemologist Who Made His Field Affordable, Dies at 93
A pillar of the community, he used his chemistry degree and analytical mind to teach himself gemology and then create a line of affordable instruments.
Dr. William Hanneman, known for his many contributions to gemology including creating a line of affordable instruments, died last month at the age of 93. He is pictured here at left with his friend Alan Hodgkinson, also an award-winning gemologist.
Monterey, Calif.—Dr. Walter William Hanneman, the gemologist known for sharing his knowledge and helping make gemology accessible to all, died Dec. 12 at his home in California.
He was 93.
Hanneman, who was known as Dr. Bill, received his undergraduate degree from the University of Illinois, Urbana-Champaign and his Ph.D. in organic chemistry at the University of Nebraska, Lincoln.
He then worked as a research analytical chemist for several major corporations, including the DuPont Research Lab, the Standard Oil/Chevron Refiner, and the Kaiser Center for Technology.
His father was an avid lapidarist and introduced Hanneman to gems and minerals at a young age, kicking off a lifelong hobby of gemology, according to his online obituary.
Hanneman’s early endeavors in education would later lead to a mission to make gemology affordable to anyone who was interested.
In the mid-1960s, he decided he wanted to learn gemstone identification.
But, after being told about the prerequisite classes and their associated costs, Hanneman rejected that path, opting instead to teach himself through popular books on the topic and his advanced degrees in chemistry.
He felt his 40 years of experience qualified him to examine gemology from perspectives far different from those of the traditional industry schools and called himself the world’s foremost S.O.G.—Self Ordained Gemologist.
As a champion of aspiring gemological students, Hanneman believed anyone with an interest in learning about gems should have the opportunity to do so.
Using his analytical mind and chemistry background, he set out to create an alternative and affordable path to gem identification, creating his own line of instruments under his name, Hanneman Gemological Instruments.
These instruments are still used worldwide.
Hanneman also authored numerous articles and books in his efforts to make gemological information accessible, including “Pragmatic Spectroscopy for Gemologists,” “Diamond Cut Grading Simplified,” “Naming Gem Garnets,” and his signature book, “Guide to Affordable Gemology.”
He also shared his knowledge openly through lectures, seminars and workshops, inspiring generations of gemologists and gemological enthusiasts.
In a Facebook post, gemologist and author Antoinette Matlins called him a “brilliant gemologist, a man who gladly shared of his knowledge and talent, a warm supporter of the Accredited Gemologists Association—and how many of us have the little practical gem tools he created and gave to AGA members—and simply a wonderful, talented, loving, thoughtful man who loved life and did what he loved throughout his own.”
The AGA honored Hanneman in 2018 with its Antonio C. Bonanno Award for Excellence in Gemology, and the International Society of Appraisers gave him its Industry Service Award for contributing to the advancement of the appraisal profession.
He was 93.
Hanneman, who was known as Dr. Bill, received his undergraduate degree from the University of Illinois, Urbana-Champaign and his Ph.D. in organic chemistry at the University of Nebraska, Lincoln.
He then worked as a research analytical chemist for several major corporations, including the DuPont Research Lab, the Standard Oil/Chevron Refiner, and the Kaiser Center for Technology.
His father was an avid lapidarist and introduced Hanneman to gems and minerals at a young age, kicking off a lifelong hobby of gemology, according to his online obituary.
Hanneman’s early endeavors in education would later lead to a mission to make gemology affordable to anyone who was interested.
In the mid-1960s, he decided he wanted to learn gemstone identification.
But, after being told about the prerequisite classes and their associated costs, Hanneman rejected that path, opting instead to teach himself through popular books on the topic and his advanced degrees in chemistry.
He felt his 40 years of experience qualified him to examine gemology from perspectives far different from those of the traditional industry schools and called himself the world’s foremost S.O.G.—Self Ordained Gemologist.
As a champion of aspiring gemological students, Hanneman believed anyone with an interest in learning about gems should have the opportunity to do so.
Using his analytical mind and chemistry background, he set out to create an alternative and affordable path to gem identification, creating his own line of instruments under his name, Hanneman Gemological Instruments.
These instruments are still used worldwide.
Hanneman also authored numerous articles and books in his efforts to make gemological information accessible, including “Pragmatic Spectroscopy for Gemologists,” “Diamond Cut Grading Simplified,” “Naming Gem Garnets,” and his signature book, “Guide to Affordable Gemology.”
He also shared his knowledge openly through lectures, seminars and workshops, inspiring generations of gemologists and gemological enthusiasts.
In a Facebook post, gemologist and author Antoinette Matlins called him a “brilliant gemologist, a man who gladly shared of his knowledge and talent, a warm supporter of the Accredited Gemologists Association—and how many of us have the little practical gem tools he created and gave to AGA members—and simply a wonderful, talented, loving, thoughtful man who loved life and did what he loved throughout his own.”
The AGA honored Hanneman in 2018 with its Antonio C. Bonanno Award for Excellence in Gemology, and the International Society of Appraisers gave him its Industry Service Award for contributing to the advancement of the appraisal profession.
“The AGA was deeply saddened to hear of the passing of Dr. William Hanneman, recipient of the Antonio C. Bonanno Award for Excellence in Gemology,” Donna Hawrelko, former AGA president and close friend of Hanneman, said on behalf of the AGA in a statement sent to National Jeweler.
“Dr. Bill, as he was affectionately known, was a generous, brilliant scientist, author, and inventor of affordable equipment for the gemmologist. (He) was always willing to share his vast knowledge with students, gemologists, and scientists alike. He will be deeply missed by everyone who had the privilege of knowing him.”
Outside of gemology, Hanneman was an avid fly fisherman, an area in which he also made contributions.
He created the “Hanneman Common Cents System,” an objective system for the relative measurement of rod action, power, and frequency, which was published in RodMaker Magazine and Tenkara Angler magazine.
He also wrote a book called “What Trout Actually See.”
Hanneman was preceded in death by his wife of 65 years, Margaret Marie (Lynch) Hanneman; his parents; his sister, Katharine Hanneman Schoenberger; niece Susan Schoenberger Spencer; and two sons-in-law, Cliff Tipton and Steve Jack.
He is survived by his four children: Kathleen, Bill, Patricia, and Judith (Peter); his granddaughter Deirdre (Shane); three great-grandchildren, Shane, Kylie, and Tyler; niece Barbara; and nephew Peter.
In keeping with his wishes, no service is planned. Rather, his family encourages raising a glass to toast a life well lived.
“Dr. Bill, as he was affectionately known, was a generous, brilliant scientist, author, and inventor of affordable equipment for the gemmologist. (He) was always willing to share his vast knowledge with students, gemologists, and scientists alike. He will be deeply missed by everyone who had the privilege of knowing him.”
Outside of gemology, Hanneman was an avid fly fisherman, an area in which he also made contributions.
He created the “Hanneman Common Cents System,” an objective system for the relative measurement of rod action, power, and frequency, which was published in RodMaker Magazine and Tenkara Angler magazine.
He also wrote a book called “What Trout Actually See.”
Hanneman was preceded in death by his wife of 65 years, Margaret Marie (Lynch) Hanneman; his parents; his sister, Katharine Hanneman Schoenberger; niece Susan Schoenberger Spencer; and two sons-in-law, Cliff Tipton and Steve Jack.
He is survived by his four children: Kathleen, Bill, Patricia, and Judith (Peter); his granddaughter Deirdre (Shane); three great-grandchildren, Shane, Kylie, and Tyler; niece Barbara; and nephew Peter.
In keeping with his wishes, no service is planned. Rather, his family encourages raising a glass to toast a life well lived.
More on Grading
The Latest
SurveysMar 19, 2026
NRF Forecasts 4% Retail Sales Growth in 2026From a weaker labor market to inflation, NRF Chief Economist Mark Mathews gave insight on what retailers can expect this year.
AuctionsMar 19, 2026
26-Carat Diamond Tops $1M at AuctionThe historic stone, which sold at Elmwood’s in London, is the largest white diamond to be offered on the U.K. market in more than a decade.
Brought to you by
Protect Your Customers and Your BusinessYou deserve to know what you are selling–to protect your customers as well as your business and your reputation.
Events & AwardsMar 19, 2026
JCK Rocks To Ride With NellyThree-time Grammy award-winning artist Nelly is set to perform at the annual event at Tao Beach in Las Vegas on May 31.
Weekly QuizMar 19, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
AuctionsMar 18, 2026
Collection of the ‘Severely Beautiful’ Lady Wardington Fetches $161KThe model and fashion editor’s gold evening bags were the top lots at the London sale, going for more than $25,000 each.
PodcastsMar 18, 2026
Episode 3: An Interview With Jewelry Designer Johnny NelsonFresh off winning the David Yurman Gem Awards Grant, Nelson discusses the ring that launched his career and his plans for the future.
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.
SourcingMar 18, 2026
Lucara Recovers Nearly 37-Carat Blue DiamondThe “stunning” Type IIb stone was found via x-ray technology at its Karowe mine in Botswana.
MajorsMar 18, 2026
Stuller Releases New Edition of Jewelry Education Book“The Basics of Jewelry” has been updated to include modern topics and visuals.
Events & AwardsMar 17, 2026
The Best Moments From the 2026 Gem Awards Held just before the Oscars, the jewelry industry’s big awards show had its share of standout jewelry, gowns, and acceptance speeches.
SourcingMar 17, 2026
Cruzeiro Mine Debuts ‘Winter Tourmaline’The Brazilian mine’s new collection features cabochons in soft, muted shades like silver and lilac.
TrendsMar 17, 2026
Natalie Portman Is Tiffany & Co.’s New AmbassadorThe Academy Award-winning actress stars in Tiffany & Co.’s latest commercial, which debuted Sunday night during the Oscars.
MajorsMar 17, 2026
Kering Establishes Jewelry Division, Appoints CEOThe organizational change follows Kering’s promise of a transformation after declining sales in 2025.
EditorsMar 16, 2026
2026 Oscars Jewelry: One Necklace After AnotherNatalie Francisco rounds up the top Oscars jewels, including Rose Byrne’s Taffin necklace with a more than 20-carat yellow-brown diamond.
WatchesMar 16, 2026
TAG Heuer Has a New CEOBéatrice Goasglas has been with TAG Heuer since 2018. She is the first woman to head the 166-year-old, LVMH-owned watch brand.
IndependentsMar 16, 2026
Ben Bridge Debuts New Honolulu BoutiqueThe store features the first in-store build for the jeweler’s in-house “Bella Ponte” bridal brand.
AuctionsMar 16, 2026
Bonhams Paris To Offer Antique, Signed Jewels The live fine jewelry auction will take place later this week, showcasing antique pieces, rare gemstones, and signed jewels.
CollectionsMar 13, 2026
A Trio of Jewels from the 3 Gem Award Nominees for Jewelry DesignOur Pieces of the Week honor the 2026 nominees for the Gem Award for Jewelry Design, Silvia Furmanovich, Cece Fein-Hughes, and Catherine Sarr.
WatchesMar 13, 2026
Citizen, Vera Wang to Launch Watch CollectionThe 24-piece watch collection is set to debut in spring 2027.
SourcingMar 13, 2026
Andrea Pooler Joins Third-Generation Diamond Company as COO Pooler, who has more than 25 years’ experience in jewelry, is now chief operating officer of Modani Jewels, Soham Diamonds, and SNJ Creations.
MajorsMar 13, 2026
24 Karat Club of New York’s Banquet to Return to Waldorf AstoriaThe reopening of the Waldorf Astoria means a homecoming for the industry group’s annual event, which will take place Saturday.
CollectionsMar 12, 2026
Jessica McCormack Sends Gold, Gemstones Into ‘Orbit’McCormack looked to the 19th century’s “golden age” of astronomy when designing her new celestial-themed collection.
Events & AwardsMar 12, 2026
Johnny Nelson Wins David Yurman Gem Awards GrantNelson will be honored as the inaugural grant winner at the Gem Awards gala on Friday.
TechnologyMar 12, 2026
Caratwise Launches, Names Former Signet Exec CEO The new smart design software allows jewelers to configure, price, and confirm a custom engagement ring in real time for in-store customers.
SourcingMar 12, 2026
Grandview Klein Opens New Factory in South Africa The 10,000-square-foot diamond manufacturing facility officially opened in late February and employs 50 people.
Events & AwardsMar 12, 2026
MJSA ‘Future of Jewelry Making’ Scholarship Applications OpenThe MJSA Education Foundation’s scholarships support students pursuing jewelry careers.
