Reasons? More than one.
1. Being a small item, it has to be perfect. This means that is the beads are not even, you do not get the same result.
2. Tattig pattern may be simple, but even knots are required for a small item.
3. Tatting with beads may be mastered, until you must make your joins through the beads. Which is the case here.
4. Folded join through certain beads not for unpatient tatters, at least at the begining. Of course, you can make the alternative join to finish the rosette (the Riego join), but still...
Remember these babies?
1 shuttle project, a very fine crochet hook needed. You need a good amount of beads (48 for every rosette + 12 or 24 for each middle element). Pearls of your choice.
Pattern for the base:
Told you. Simple. Just careful.
bp4: beaded picot with 4 beads (from the ones from the loop)
dp: diamond beaded picot (3 beads from the loop + 1 from the shuttle).
R1 (with 11 beads on the loop): 8ds, bp4, 4ds, dp, 4ds, bp4, 8ds, close ring, do not turn work.
R2 (with 7 beads on the loop): 8ds + to R1 (by letting 1 bead between the rings int he lower part) 4ds, dp, 4ds, bp4, 8ds, close ring, do not turn.
Repeat until you have 5 rings.
R6: (with 3 beads in the loop): 8 ds + to R5, 4ds, dp, 4ds, join (folded) 8 ds, close ring.
Work now the central element.
Start ring with 6 beads in the loop. Work 1 ds make picot with 2 beads (1 from the loop, the other one from the shuttle) 2 ds. repeat until you finish the beads from the loop, finish with 1 ds, close.
You can also change the amount of ds, depending on your beads.
For the ring I just made diamond picots instead of these double beaded picots.
I worked with 30 Penny thread (like a 40 Lizbeth thread) and 11 Toho rocailles. With a different thread size and other beads, the appearance may be different.
Mount the elements together. If you have stud little pearls, they are perfect. You can even think about working more of these elements to make them as exchangeble sets, why not?
I hid the head of my stud with another small flower (3-6-3 petal) for a better finish.