This Dandelion brooch is made with one of my Dad's gemstones, he cut this Citrine from ruff and facetted it beautifully 4.39ct, 11mm, Zircon cut, the raw material came from a German company in Idar-Oberstein (Petsch24), on my next visit home I will try to find my Dad's notebook, to see can I find out more about 73 F. Total measurement of the brooch: 84X32mm, 15g. The Citrin is set in 14ct gold, the other arial parts are made from silver.