First, let me make clear this section is for *licensed* Jem merchandise only, I'm not really interested in lighters, mouse pads, address labels and snow globes (etc etc) that people have made on their computer to sell on eBay.  Any knock-off items lucky enough to be posted on this site will go either in the knock-offs section or their country of origin. That said...
Jem had a plethora of products licensed by Hasbro, focusing mostly on school items, games, party supplies and grooming.  The following is a list of licensed Jem items I know about that were released in the US or Canada, usually both.  Europe, Australia, South America and possibly other countries had their own unique items, to see information on those, go to International Jem.  I am always interested in hearing about new Jem items, if you have any information to offer, feel free to e-mail me! 

School Items
Games & Puzzles
Watches
Party Supplies
Cosmetics & Grooming
Costumes & Children's wear
Other Jem items

• purple
• yellow

• Dark Pink (In Package Back of Package)
• Purple

• pink Glitter 'n Gold thermos

Back Pack

• Mauve with 1st Year Holograms: The following information is quoted from the catalogue: "Woven nylon backpack features screen print of Jem's group, the Holograms (we've even riveted a plastic guitar to the front).  Top zip, padded adjustable shoulder straps, locker loop. 12 X 13.5 X 3". " 

• Round Bag: Quote taken from the catalogue: "Jem screen-printed record-shaped bag is a real groove! Vinyl backed rayon bag has 8" diameter, is one & a half inches deep.  Zip closure.  Attached coin purse has three inch diameter."
• Tote Bag: Dated 1986. With Shana in the front.

Duffel Bags - see Jem Sleeping Bags.

• Pop-A-Point crayons
• Pop-A-Point Pencils - these are mentioned on the back of the Spindex cards, have not yet seen one.
• Diecut erasers (2 on blister card, star shaped Jem, Triangular shaped Pizzazz)
• Pencil toppers -these are mentioned on the back of the Spindex cards, have not yet seen one.
• Pencil Pouch (sold singly and with the School kit below)
• Ball-point pens
• Jumbo Erasers (single eraser on blister card, have seen Pizzazz so far, there probably was at least a Jem one as well)
• Figurine Erasers - So far have seen Pizzazz, Jem, Rio & Aja.  The Jem one was also sold as a cake decoration in the US, and they were also sold in South America. They look like PVC figures, I doubt they actually erase anything!
• Spindex School Kit, bubble on card, contains

• Pencil Pouch (pink with Jem standing in front of Rockin' Roadster),
• Purple Ruler with pink sticker, has pictures of Jem, Aja, Pizzazz and Stormer
• Purple round pencil sharpener, sticker of Jem on front
• Pink eraser with sticker of Pizzazz on front

Games (Milton-Bradley) All come with cassettes.  There are 6 songs per tape, all on one side.  The other side has little snippets of the songs (2 seconds of the chorus, for example) so you can use the tapes to play the game.  There aren't any instrumentals on these tapes.  I'm fairly sure all 3 came in both US and Canadian versions; the latter have some French text as well as English on the boxes and instructions.  The songs are not in French.

• Fashion Flash (yellow box, back); Features re-drawn pics of all the Holograms wearing the first year line of fashions.  Songs on cassette are as follows:

Cassette tape songs list	Fashion card graphics
Jem Theme Music Is Magic I've Got My Eye On You Click/Clash Like A Dream Makin' Mischief	Aja in Encore Aja in Like A Dream Aja in Let's Rock This Town Aja in Rock Country Kimber in City Lights Kimber in Only The Beginning Kimber in Permanent Wave Kimber in Up & Rockin' Shana in Command Performance Shana in Sophisticated Lady Shana in Gettin' Down To Business Shana in Music In The Air

• Rock and Romance (Canadian Version) (pink box, back); Who does Rio really love?  Features magnetized cards that repel or attract each other.

Casette tape songs list

• Jem Theme
• She's Got The Power
• Twilight In Paris
• Truly Outrageous
• Too Close
• Deception

• Concert Clash (purple box, Canadian version, Canadian version back); Collect record tokens (uses real Jem/Misfits song titles) and become the most popular group.  A Jem-Misfits rivalry game.

Cassette tape songs list

• Jem Theme
• Takin' It All
• Outta My Way
• Winning Is Everything
• Only The Beginning
• Gettin' Down To Business

• Image changes from Misfits to Holograms (Thanks to Lorna for these photos!)
• Image changes from Jem to Jerrica

Watches

• Pink and white keyboard design. Back of package.
• Orange and Yellow audio tape design.  Canadian.  Canadian package back.
• Green Record design

Cake Topper (this same figure was also sold by Spindex on a blister pack as a figurine eraser.)

• Reach for the Stars Cosmetics Set contains one 1/2 fl oz bottle of yellow cologne, necklace and clip on earrings.  Box has a plastic handle on top of box for carrying. Dated 1986.
• Styled For Stardom Cosmetics set: Like the Reach for the Stars set came in a box with plastic handle.  Came with cologne bottle, container of talc and two pink sparkly clear hair clips.
• Jem On Tour Cosmetic Set (have not seen this personally)
• Glamour 'n Glitter Cosmetic Set comes with round compact mirror (different from the ARC one), two lipsticks, two nail polish.

• Nail tint n' Decals Cosmetic Set
• Frosted Lip Gloss n' Decals Cosmetic Set 
• Lip Pot Duo 'n Decals
• Cologne 'n Decals
  

• 3 piece dresser set: hot pink plastic comb, brush and mirror set, child size. This is one of the easier licensed items to find.  They may be based on the brush, comb and mirror from the Rock Backstager playset.
• Deluxe Take Along Vanity Set #1, Came with cosmetic bag, compact mirror, comb and brush.  They aren't the same ones that came with the Arc 3 piece dresser set. This one has a pale pink cosmetic bag with the Jem logo in pink and yellow & "confetti" around it. The brush has the Jem logo on a pink and yellow graded background.  The comb is rounded with a decal on it, has a handle.
• Deluxe Take-Along Vanity Set #2, same as above, but the comb is rectangular.
• Deluxe Take-Along Vanity Set #3, same as above with rectangular comb, but the case is dark pink with a circular white Jem logo on the front, the brush also has a white label with the Jem logo on it.

• Glitter 'n Gold Travel Kit contains 60 mL bottles each of cologne, shampoo and bubble bath, has a cardboard folding handle on top for easy carrying. Dated 1987.  
• Glitter 'n Gold Nail Polish and Lip Shine boxed set of lip gloss and nail polish.  The same lip gloss and polish are found in the Beauty Kit below.
• Glitter 'n Gold Beauty Kit Boxed set with nail polish and lip shine from set above, as well as a container of talc and a bottle of some other liquid.
• Glitter 'n Gold Nail Polish boxed nail polish sold separately.
• Glitter 'n Gold Bath Collection: Boxed set of 4 different mini soaps (Glitter N' Gold, Flash N' Sizzle, Glitter N' Gold Rio, one with Jem wearing a dress never before seen) and a bottle of bubble bath.
• Glitter 'n Gold Cologne ? (not sure if this was actually sold separately)

• Boxed Halloween Costume with mask and plastic Jem dress!  Comes in various sizes, the one shown is 8-10.  Have also seen this with a generic rainbow cardboard box.
• Halloween Costume on a hanger; same as above, on cardboard hanger.

• Screen-Printed pink, longer-length skimp top:  Wear with stirrup pants or as a minidress (stirrup pants are generic and could be bought separately).
• Screen-Printed white top  long sleeved shirt with Jem logo and keyboard design. (skirt shown is generic and could be bought separately).
• Screen-Printed Black skimp top: Black with Jem logo and musical notes (stirrup pants are generic and could be bought separately).
• Bright Fuchsia long sleeved/long length sweat top/mini dress, with small Jem logo
• Long-sleeved Polo style shirt, white with pink collar, with redrawn box art of Jem and the Holograms as well as the Jem logo. Says "Music is Magic".

Adorable Kids (1989 Hasbro Canada) Probably the latest 80's date I've ever seen on licensed merchandise, new art and fashions.

• White and Black Tank Dress, with Jem wearing a bikini sitting on a Jeep. 
• Black T, Jem logo, "Rock Video" - with Jeam wearing zebra print bodysuit, green jacket and black mini (never seen this outfit on Jem before!)
  

Unknown Manufacturers (miscellaneous manufacturers, could be several different or repeats of above)

• Jem Child's shorts set: "the t-shirt was white with Jem in a shirt and shorts hitting a tennis ball, an in the back ground there was roses and a crowd going wild with the jem logo on there somewhere. and the shorts were pink with green tennis rackets and yellow tennis balls on them, if I remember correctly, they were like stripes up and down on the shorts."
• Black long sleeved shirt with Jem holding mic on triangle pattern, Jem logo in bottom right corner. 
• Dark pink shirt with checkerboard record sleeve/record, Jem in pink dress standing in front, Jem logo on bottom right corner.
• Top and pants, top is white with yellow shoulder area, blue sleeves, drawing of Jem and logo on front, blue pants.
• Shirt, Pants & star earrings set from JC Penney's
• Sweat pants; Jem singing into a microphone drawing on one leg and a Jem logo on the back.

• Slippers (Dark pink slouch style)
• Slippers (Rubber soled pink with silver threads, Jem with one leg up pose on front of toe)
• Sneakers High top beige with jem singing into mic, logo and music notes design.
  
• Sneakers Pink satin with rainbow laces, Jem's face in star on the side. Tread has Jem & guitars logo.
  
• Dress Shoes
• Glitter 'n Gold Jem Galoshes  They somehow made rubber boots glamorous enough for Jem...
• Jem socks silver tinsel with Jem 1st ed. illustrated poster image- COOL!  Package shows Glitter 'n Gold Jem art so they must be dated 1987 or later.
• Winter Boots: white nylon with "confetti" design, small image of Jem on the front. Tread has Jem logo, stars, musical notes! 

• Sleeping Bag w/matching Duffel Bag (1986) Orange with Jem singing into a microphone. Bag is yellow on side and says "Music is Magic"
• Sleeping Bag w/matching Duffel Bag Glitter 'n Gold Jem with Rio.
• Slumber Tent (ERO industries).  Dark blue/fuchsia, features Glitter 'n Gold Jem, Rio and the Star Stage.
• View Master 3 reels on card. 
• Viewmaster gift set, comes in nicely re-drawn Jem themed box, with viewmaster and reels. (photo is a collage of sides of box and close ups of the reels)
• Jem Presto Magix (boxed, American Publishing Corp., 1986) Recording studio background, features 1st Edition Jem, Kimber, Shana & Rio in Rappin'.
• Jem Presto Magix Glitter Transfers (boxed, American Publishing Corp., 1986) Features 1st Edition Jem & the 1st Year Holograms.
• Jem Presto Magix (boxed, American Publishing Corp., 1986)  have only seen a bad scan of these, looks 8X10 with redrawn Jem and Aja on front.
• Holograms Magic Slate  (Golden) 
• Jem/Jerrica Magic Slate  (Golden)
• Jem Towel Notice Jerrica is in the Star, (not Rio) and Shana has a white skintone.  Not redrawn totally well but still cool.
• Jem pin: Photo and following quote courtesy of Shevona: "I can't say for sure if it was an official Hasbro product or not, but it is definitely vintage."