Hi Lyra,
This does look like a South Sea strand from the picture. It would be easier to be certain if the resolution were better, but it does appear to be a real piece.
If so I would have to say I think it is a very good deal.
If you can get the seller to correspond regarding the piece this is what I would ask:
What is the coloration of the strand?
It is difficult to see the actual coloration from the picture. Even a baroque strand can be very valuable if the coloration is dark gold. With Golden South Sea pearls a dark gold drop is much more valuable than a very light (champagne) round. But many of the light strands are enhanced which will also affect the value.
How is the surface quality of the strand?
Where is the strand from? The auction states the strand is from Tahiti, but I would presume it is from Indonesia.
If the strand is indeed a South Sea strand (and again, it definitely appears to be), it is a very good price for more or less any quality in that size range.
If you do decide to purchase the strand let us know. I would like to hear your reaction when you receive the piece.