About Dr. Ari Roark Expertise Metalsmithing, Goldsmithing,Jewelry Making, Gemology,Metallurgy,Art Jewelry,Jewelry Appraising,Metal Mill Work,Jewelry Education,Group Projects Adaptable to Special Populations as well as ordinary groups,Ethnobotany,Metal Clays, International Jewellery Law,Trade Law,Rock hounding,Industrial Health and Safety Assessment and Education as it pertains to Jewelry Studios (of all sizes and manufacturing concerns relative to the Trade, Jewellery Trade Organisations,Objective US Jewelry School critical Analysis,Applied Anthropology,goldssmithing,lapidary,metals,refining
Experience More than 35 years experience in the Jewelry Industry, Juris doctorates, PhD's in Anthropology, Cultural History, Cultural Geography, Mining Locations Assessments, Industrial Health and Safety Inspector to the Jewelry Industry, Montessori Educator, Occupational Therapy, Natural Historian, Scholar of Jewelry Evolution, PhD in Creativity ( the analysis of the divergent genres of thought on the process and impetus of the essence of creativity as a state of being expressed tangibly),Extensive Fieldwork with populations of Traditional craftsmen worldwide, former Peace Corps volunteer, Former VISTA volunteer, Etc.
Organizations too numerous to list
Publications prefer not to answer for reasons related to plagiarism
Education/Credentials PhD Anthropology( Applied(1), Cultural(2)Ethnobotany(1),PhD -Physics (Metallurgy 1)( Wave and Particle Dynamics 1),,JD,MD,MFA-Metals/Jewelry,,MFA-Printmaking, MFA-Sculpture, Extensive undergraduate degrees, extensive post doctoral work, Montessori Educator Certification (Primary and Secondary)..many, many Degrees, Grants, and Awards in my past as an Academic turned Jeweler, OSHA Certifications
Awards and Honors too numerous to list including 3 Honorary Doctorates, Two Humanitarian Related Awards, and Service on Many Boards of Directors
Question I have a gold bracelet, it is european, my grandmother left me, it is marked with the # 750 can you tell me what this means? Thank you, Tina
Answer Hello Tina,
What your grandmother left you is an 18 karat gold bracelet.18kt gold is 75% pure gold the balance alloy made of silver and copper depending on the colour and may have traces of other metals too as a colouring or strengthening additive or deoxidant. 14 karat is 57% gold ( or less), sometimes expressed as 570 gold and 22kt is 85 % pure gold sometimes expressed as 850 .
I hope this helps you know your golds.Generally european gold jewelry made before the 1970's is expressed with the respective percentages, after that period it was standardised all over the free trade world and is expressed in karats i.e.- 14 kt, 18 kt, 9 kt in the UK and overseas ,10kt in the USA, and 22kt most commonly.
If you have a piece marked 14/20 g, or 12/10 GF it indicates the piece is 20% gold filled which is a bonded layer of 14 or 12 kt solid gold over a base metal,usually brass though in Vermeil its over fine silver (.999 is fine silver .950 is sterling) and is usually marked 22 kt V, or D'ore..I hope this provides all you ever needed to know about precious metals markings!
Best regards, Ari
