The Prince of Wales apparently has a special nickname for his daughter-in-law: “Tungsten.” According to Cosmo, the 71-year-old gave Markle the name after he likened her tough personality to the metal with the highest melting point. Interesting.
The Daily Mail reported that according to sources, "Prince Charles admires Meghan for her strength and the backbone she gives Harry, who needs a tungsten-type figure in his life as he can be a bit of a softy. It's become a term of endearment.”
The future king and Duchess of Sussex have developed a close relationship as father-in-law and daughter-in-law following her marriage to Prince Harry. Makes sense, considering he did walk her down the aisle in place of her own father.