These are naturally colored akoyas, but the nacre is thin.
Sometimes when the bead is implanted in the oyster's gonad, a dark liquid is released, which coats the bead. Nacre is laid down over the bead. The nacre itself is clear but through the layers of nacre, the light creates a kind of illusion which makes the brown substance appear bluish.
Where the nacre is thin, the color seen will be brown instead of silver/blue.
These kinds of pearls can be fun to wear but be gentle with them-- the thin nacre can crack. They are better suited for a necklace than a bracelet, which would get banged around more.
If you would like to restring them, have a look at my tutorial. It's easy and inexpensive to do and would make the necklace look better, as the thread is old.
How to string (or restring) your pearls on doubled Pattye's Serafil, Beaders Secret, and Power Pro
This is not hard-- really! It is harder to describe it than to do it. Anyone can learn to string their own pearls!
If after reading through this, it sounds too daunting, I suggest making a mini-strand for practice first. Make one 12-15 pearls long just so you can practice how to knot the end 3 pearls on each side and attach the clasps; the middle pearls are easy to knot.
To just practice knotting (without bothering with clasps), make an overhand knot, string on a pearl (or...
