This does not look like Trifari... and all Trifari pieces ARE signed. I have specialized in selling Trifari for years and would never represent a piece as "unsigned Trifari". If there is such a thing it is extremely rade and would not be from this era which looks to be 1960s. In the 1960s Trifari signed all of their pieces. As for the earrings, you usually can tighten them up by adjusting the two little "arms" on each side of the hinge of the clip (hope this makes sense). Here is a good read on Trifari hallmarking:
While you cannot tell everything from a mark on a piece of jewelry since many marks are faked but you can start by learning what an authentic mark should look like. Trifari signed and/or marked all of the firm's costume jewelry, so look for the identifying mark. Back in the day, the Trifari firm reminded customers of their commitment when it advertised that "If it isn't signed, it isn't Trifari." Authentic Trifari costume jewelry has a Trifari mark however over the years, the Trifari marks have changed. From the mid 1920s until about 1930, Trifari costume jewelry was marked with a "KTF" logo featuring an oversized central letter "T" which stood for Trifari. By the 1930s, the most common mark for Trifari pieces was the "TRIFARI PAT. PEND." mark. This mark was used from the early 1930s. In the late 1930s, the "TRIFARI PAT. PEND. mark was used along with the Crown Trifari mark which showed a crown atop the letter "T" for Trifari from 1937 to 1955.
There is more but I am sure that you can get the gist. I just don't want you to think that there are unsigned Trifari pieces out there.
