Research & Medical Tourette Association Annual Scientific Meeting The Tourette Association of America will convene its annual scientific meeting on Thursday, April 20, 2017, at the Bethesda North...
Bort-like heavily twinned diamond from Congo. Bort or boart is a term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. In the manufacturing and heavy industries, bort is used to describe dark, imperfectly formed/crystallized diamonds of varying levels of opacity.
On French silver jewelry, the most often-seen mark is the boar s head, the mark of the Paris Assay Office, indicating a fineness of 800 or higher on small articles (such as jewelry). This mark was in use from 1838 to 1961.n French silver jewelry, the most often-seen mark is the boar s head, the mark of the Paris Assay Office, indicating a fineness of 800 or higher on small articles (such as jewelry). This mark was in use from 1838 to 1961.