This is a rare turn of the century Tiffany stamped lapel pin. The swastika was a common good luck symbol adopted by the UK and the US during the Victorian times. This is not Nazi at all. I dont really know what the gold content is or the gem but I do know Tiffany doesn't due costume jewelry. The size is 3/8 inch and the stem is 2 inch. Its a rather attractive piece I must say. Quite a conversation piece after you explain the history. Be bold! The face has more of a brushed finish with small diamond, I think, It is not flashy or gaudy. Mens Victorian jewelry were subdued for a reason. A gentleman doesn't show off for one thing, and, in particular, when a gentleman has a female companion his jewelry should not distract from her attention. The smaller and less attractive piece I will throw in. It has no markings. The Tiffany piece is marked Tiffany & Co. Update 1NOV25. From what I can gather this item was made during the Edwardian times (1904-13). It was phased out during the 1930"s soon after Hitler created his "party" and adopted it. The swastika was a common symbol of good luck before that. You could see it used from anywhere from key chains to decorative building facades, According to Chat GBT this is extremely rare!!