chassidishY.U.type
Rav Herschel Schachter, Rav Berel Wein, Rav Avraham J. Twerski, Rav Yisroel Belsky, Rav Simcha Kook, Rav Zalman Nechemia Goldberg, and the Roshei Yeshiva of Yeshivat Aderet Eliyahu wear it. (I assume your are talking about the Murex Trunculus that was discovered by Rav Yitzchak Herzog, the second Chief Rabbi of Israel.)
Many Rabbis today debate whether it is real or not. Rav Chaim Kanievsky, Rav Yosef Shlomo Elyashiv, Rav Aharon Leib Shteinman, Rav Avigdor Nebenzahl, and many others do not wear it.
This is an issue you should discuss with your Rav