White gold, turquoise & kyanite 'Morse code' T.A.C. earrings

18k white gold earrings with 18.75 carats of (untreated) turquoise and 44.25 carats of kyanite. The earring backs feature TAC written in repeat, in Morse code. (T = dash, A = dot dash, C = dash dot dash dot) The Amsterdam Collection. Signed with 3 St. Andrew's Crosses, the insignia of Amsterdam, and numbered: H4. The Netherlands, recent.