Rapture; unproduced prototype for 1988
Above, prototype of Rapture, a polaroid taken at Hasbro HQ, for as reference materials for Sunbow.  After much scrutiny, it appears as though this doll is wearing the exact same dress that is shown on the following doll.  However,  her face mold is a modified Clash/Danse/Jetta - not with the unique "Rapture" face mold used on the following doll...  "Fiasco" - The early name for Rapture, shown above.  She, along Minx and Riot prototypes, was sold on eBay in 2007, and purchased by Jemboy.  The tights she was sold with were fishnets (Jemboy has her displayed in lace tights), they still had a bit of glue on them from being glued into her stand.  She was made for a presentation for the proposed 1988 line for Jem.  Apparently the project was green-lighted, but the whole line got scrapped before production got much further.  Notice her tan skin tone - it is unique to the third year dolls, such as Rockin' Romance Jem - no Jem doll was ever commercially available in this shade.  Also different is her face mold, which bears a resemblance to the old Clash/Danse/Jetta mold.  Interestingly, Hasbro also tried out this new mold for Jem/Jerrica as well as an '88 Pizzazz doll.  It is unlikely all three dolls would have shared the mold had the line continued.   She did come with a guitar as well, a modified first-year Roxy guitar with a hand cut/designed decal and unique guitar strap.
An interesting bit of trivia: there used to be cut outs on the sides of her dress (between the 45' angled stripes and the horizontal stripes at her waist), making for a much racier costume.  At some point the panels were sewn back in! 
Photos were taken by me, used with permission from Jemboy.
Then to everyone's surprise, is a nude Rapture.  She was discovered before Jemboy's dolls were auctioned, so she was a bit of a mystery for a time.  She has much in common with Jemboy's - the same unique tan shade, the same face mold and similar (if not the same) make up - but the hair is slightly shorter.  Also unlike the prototypes, she is stamped on her lower back like some of the very last Jem dolls made; ng.59 suspects that she can be dated later than the dressed doll for this reason.  She appears to be a prototype, not a commercially available doll, with factory paint.  It is a shame we don't know anything about her, or how she ended up in an attic in France.  But such is the mystery of Rapture! 
Photos of French Rapture are used with permission from ng.59.