Introduction –  The Fogcity RTA by GemzGemz Fogcity RTA FK

The Gemz Fogcity RTA is one of the newest RTA’s that Gemz has released to the market.

Some of their other products include Prime mover RTA, Luckstar RDTA, and of course the excellent Axis RTA that we reviewed not long ago.

Designed and manufactured by Shenzhen Gemz Technology Co Ltd who are a Chinese company based in Shenzhen China.

They have in house designers that work closely together on product design and engineering to bring their visions to life.

After the great experience I had with the Axis RTA I’m really quite excited to see if the Fogcity RTA lives up to the high standard I have come to expect from Gemz – let’s find out.

In The Box

  • 1 x Fogcity RTA
  • 1 x Glass Tube
  • 1 x Baggy – Allen key, O rings and spare screws
  • 2 x 3.5mm 24ga coils
  • 1 x User Manual
  • 1 x Vape cloth

    Gemz Fogcity RTA in box

Main Specs/Features

  • Diameter: 24mm
  • Length: 54mm
  • Capacity: 3ml
  • Material: Stainless steel, Pyrex glass, PEI, Silicone
  • Resistance(coils): 0.2ohm
  • Colour: SS, Black, Gold, Rainbow

Design and Build Quality

The quality of the Fogcity RTA and presentation in the box is very good; the design is innovative but a bit perplexing to me. I will say for what the tank is its been made well from stainless steel, Pyrex glass and Ultem.Gemz Fogcity RTA assemb

The Fogcity dismantles into 7 partsGemz Fogcity RTA bits


Is a yellow polished Ultem 810 goon style drip tip that fits into the top cap.

Top cap and ring

The top cap is in 2 parts.

A ring which screws to the main section. The top cap has space for your 810 goon style drip-tip with an O ring inside to hold the drip-tip in place, Fogcity has been engrave twice around the cap and the shape of the cap is sloped.

Looking down through the cap at first I thought it was sealed but if angled you will see four outlet slots for your vapour to exit.Gemz Fogcity RTA TC

The reverse side of the top cap has a plate with threads for screwing into the main structure.

The Body of the Tank

According to the information I have about the Fogcity RTA the Pyrex glass tank should just push off.

I tried many times to remove the Pyrex glass when this RTA was new to me, even hot water wouldn’t shift this sucker, that is until I let my wife have a go lol with her long fingernails she was able slip her nails between the glass and the metal body sort of pushing the glass up a little (thanks Gemz you cost me a trip to the nail bar!) even then the pyrex tank was very tight to remove.

The internal structure is made of stainless steel and is one part, but in two separate sections.

1. The tank which holds your e-liquid being a top fill tank you pour your liquid into the wide filling aperture which measures 10.5mm, inside you have 2 kidney shaped airflow outlet slots for you vapour these slots run down part of the structure to the coil section.

2. The coil section has a tube connecting it with the tank section.Gemz Fogcity RTA cc

On the outside of the structure you will see 2 O rings which are meant to hold the glass in place, at the bottom of the structure you have another O ring for the glass to sit on.

Gemz Fogcity RTA coils coverBase/Airlow/AF Ring

The base is made of a gold plated stainless steel with a gold plated adjustable connection pin, , the 510 threads are clean and operate as they should,

The airflow ring is removable and under the ring is an O ring which in my opinion is low quality! Its flimsy and care has to be taken or the O ring will move and disrupt the airflow.

The side bottom airflow, while the ring has large adjustable holes, the internal airflow is tiny and makes me wonder why they added adjustable airflow!

Gemz Fogcity RTA AF ringThe Gemz Fogcity RTA has a post less style deck with tiny internal airflow holes, the deck will hold two coils. The wicking space you have either side of the RTA are quite deep, the centre of the build deck is a hollow post and a cup for feeding liquid to your wicks.

Around the deck you have another low quality O ring and threading for screwing into the tank portion of the RTA.

O rings

In my opinion all the O rings that are included with this RTA are of a very low quality.

Basic Guide to Coiling/Wicking the Gemz Fogcity RTAGemz Fogcity RTA CTI

* You do not need to empty the tank before changing your coils just turn it upside down and unscrew the base.

Measure your coils before installing them into the post less deck.Gemz Fogcity RTA CID

I suggest using the same diameter post you built your coils on to help you install and position them.

Raise your coils slightly so that no parts of the coils touch the airflow holes or you will get a short.

Gemz Fogcity RTA wickedPlace your cotton through the coils and tuck the ends into the wick spaces, I like to use enough cotton so I can just move it within the coil.

Pre wick the cotton and coils with e-liquid, and tuck the tails into the wick spaces then screw the base back into the main structure.

Fill the RTA’s tank, it will hold around 3ml of liquid. Leave it for a few minutes for the wick to soak up more liquid then vape away.

How Does The Gemz Fogcity RTA Perform?

For this review I had the Gemz Fogcity RTA sitting on my Tesla WYE, using the coils that came with the tank and a 70VG/30PG -liquid from King of Clouds “Blue Slush”.Gemz Fogcity RTA MAL

The included coils they say are 0.2ohms in reality they worked out to 0.16ohms after heating and strumming.

Flavour & Leaks

I have had no leaks in the time I’ve been testing this RTA, while the draw is on the tight side, one might expect, as I did, a tighter airflow would translate to a more intense flavour, this is simply not the case here.

I have since tried different builds and e-liquids in the Gemz Fogcity RTA with the same resulting effect – very little or no flavour!

My only guess is the internal deck airflow holes along with the tiny side external airflow are just too small. Add into the mix the way the airflow travels to the mouth-piece via tubes along the side of the tank, the partly blocked top cap which creates the most annoying whistle effect and in my eyes Gemz have failed to execute a good RTA.Gemz Fogcity RTA close

Fog In The Tank Is All Mine All Mine

The idea of seeing the coils while vaping is a great idea but from the moment I started to vape with this tank the coil window fogged up so you couldn’t see what was happening to your coils or cotton and to be very honest the more I vaped with this RTA the worse the fogging looked to me.Gemz Fogcity RTA nasty fog

Hot Tank

The shear heat that this RTA generates is scary! So much so even after a few puffs you can’t touch the tank!

One of the rare plus points is that I can see what Gemz had in mind for this tank and I give them a big plus for trying something a little different.


If you are looking for a RTA that will chuck the clouds then this might be the tank for you if you’re not too worried about flavour.

At 80w+ this thing is a beast, I have taken the Fogcity up to the full 200w with the Tesla WYE in 10w increments and the result was to fill my small office within minutes with vapour lol.

While the vape is very warm aa would be expected at the higher wattages I was able to vape quite happily, I will say again that the flavour is none existent with this RTA and at 200w the 3ml tank empties incredibly fast lol.

After writing this review I looked at a couple of video reviews by trusted reviewers (MikeVapes and DJLsb Vapes) on YouTube as I thought I might be doing something wrong with this RTA. I was relieved to find that most of my conclusions about this RTA were also shared by Mike and Daniel.


  • A great deal of vapour can be produced
  • Quality of the RTA is good


  • No or very little flavour
  • To tight an airflow
  • To small airflow slots
  • Nasty whistle produced
  • Glass fogs up and looks nasty after a while
  • Difficult to remove the Pyrex tank
  • Tank gets extremely hot

Final Review Verdict

I started this review with high hopes that Gemz had at least repeated their earlier success with the Axis RTA, they haven’t!

While the quality is generally good I believe that Gemz should take this one back to the drawing board! However if you don’t care about flavour and are purely want a room full of clouds then this RTA might be for you.

Would I buy the Gemz Fogcity RTA again should I lose or damage it – A big NO from me.

Build Quality
Ease to Build on
Clouds Production
Likelihood of Buying Again If Lost or Damaged
Kevin Jeffrey
Hi my name is Kevin, I started vaping back in 2009 mainly because my little boy at 3 years old was starting to copy the way daddy smoked a cigarette! Over the years I have gained a good amount of experience with different types of vaping hardware but I'm just a normal guy who enjoys sharing my experiences. This is why I started my Youtube vape review channel in 2014. To date the channel has had over 500,000 views. Being disabled, vaping has given me a gateway to meeting people from all different walks of life, many of those I would not have met under other circumstances. The way I look at my reviews is, if I can convince just one person to give up the stinky’s my job is done. I class myself as a tinkerer as I like to take things apart to see how they work and put them back together, yes that includes e-cigarette mods! One day I would like to be able to design my own mod. I am a dedicated father, and husband to my sweetheart of nearly 30 years! Family to me comes before anything else.


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