Well, Real white gold is not yellow gold with antimony with gadolinium compounds metal; because when it is measured at temperature 700c can be effects the human life, the antimony smog is toxic can create cancer ; the gadolinium can be alloyed with iron and chromium but iron is magnetic, gadolinium compounds is Gd. Atomic 64 metal; do not use antimony to create white gold formula; white gold formula is not gdni gadolinium Gd Atomic 64 metal ... Real Pure solid white gold alloys is compounds with other precious metal and not effects human life; like antimony that can cost cancer with the smog... yes nickel be use in white gold form 1920's and in today market continue sale in U.S.A. the coin Nickel continue in U.S.A. market today... you do not need yellow gold to create white gold alloys; or the above information; only 5 % Nickel with Precious metal in today market ... Sincerely my best opinion to the best Protection to consumers... see web. Living Life Enterprises. form 1982