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Diamond CZ

Loose Diamond Cubic Zirconia

High quality simulated diamonds and lab created
gemstones from 2p a gem! (and less with discounts)

Featured Gem


Pear Pink


  1. Buy gems in any quantity
  2. Highest quality CZ that does not fade over time.
  3. Cut to high quality, please see our video's.
  4. Quick and painless ordering.
  5. All gems are in stock, ready for quick dispatch from the uk.
  6. Custom made gemstones can be ordered and cut.

High quality diamond simulants and created gems for use in jewellery making, gem collections, or just for decoration. The diamond simulants are very hard or impossible to tell from real flawless diamonds. They are even close in hardness to a real diamond and cannot be scratched, even slightly, by any normal household item. Diamond CZ, like diamonds, can scratch glass.


Round Brilliant cz
Round Brilliant
8 Hearts & Arrows cz
8 Hearts & Arrows
10 Hearts & Arrows cz
10 Hearts & Arrows
Flower & Hearts cz
Flower & Hearts
Swarovski cz
Swarovski
Star Machine Cut cz
Star Machine Cut
AAA Quality cz
AAA Quality
AAAAA Machine Cut cz
AAAAA Machine Cut
Wholesale Lots cz
Wholesale Lots
Old European Cut cz
Old European Cut
OEC Style 2 cz
OEC Style 2
Old Mine Cut cz
Old Mine Cut
Transitional Cut cz
Transitional Cut
Sunflower cz
Sunflower
Portugese cz
Portugese
Princess cz
Princess
Asscher cz
Asscher
Pear cz
Pear
Emerald cz
Emerald
Baguette cz
Baguette
Cushion cz
Cushion
Rectangular Cushion cz
Rectangular Cushion
Pillow cz
Pillow
Modern Radiant cz
Modern Radiant
Oval cz
Oval
Marquise cz
Marquise
Trillion cz
Trillion
Heart cz
Heart
Special cz
Special
Rectangular Asscher cz
Rectangular Asscher
Rectangular Princess cz
Rectangular Princess
Sq Modern Radiant cz
Sq Modern Radiant
Concave cz
Concave
Beads cz
Beads
Antique Style cz
Antique Style
Rose Cut  Round cz
Rose Cut Round
Flat back Rose Cut cz
Flat back Rose Cut
Cornered Baguette cz
Cornered Baguette
Emerald Princess cz
Emerald Princess
Lab Created Ruby cz
Lab Created Ruby
Created Emerald cz
Created Emerald
Created Alexandrite cz
Created Alexandrite
Lab yellow Sapphire cz
Lab yellow Sapphire
Lab Blue Sapphire cz
Lab Blue Sapphire
Lab White Sapphire cz
Lab White Sapphire
Cultured Ruby cz
Cultured Ruby
Lab Star Ruby cz
Lab Star Ruby
Cultured Sapphire cz
Cultured Sapphire
Lab Diff. Sapphire cz
Lab Diff. Sapphire
Lab Star Sapphire cz
Lab Star Sapphire
Lab Created Opal cz
Lab Created Opal
Lab Created Spinel cz
Lab Created Spinel
Original Radiant cz
Original Radiant
Sq Original Radiant cz
Sq Original Radiant
Star cz
Star
Tapered Baguette cz
Tapered Baguette
Trapezoid Emerald cz
Trapezoid Emerald
Trapezoid Princess cz
Trapezoid Princess
Princess Baguette cz
Princess Baguette
Nanocrystal cz
Nanocrystal
Mystic CZ cz
Mystic CZ
Natural Gemstones cz
Natural Gemstones
Lab Columbia Emerald cz
Lab Columbia Emerald
Carre Cut cz
Carre Cut
Bags cz
Bags
Packaging Services cz
Packaging Services

Do our prices look too cheap?
Our prices are very competitive and you may think that they are too good to be true. If you think this is so then please buy one of the smaller stones as a sample, or for clearer pictures, see the gallery. If you do not see what you want listed below then please suggest a cut and size using the email address in the top right corner

Lab created Rubies

These lab created rubies match the chemical properties of a natural ruby, but unlike a natural ruby they are flawless.

Lab created ruby
Created Rubies


CZ Faceted Beads

Faceted pearls of diamond cz with holes drilled through the middle so they can easily be threaded onto bracelets or necklaces.

pearls of bling
Faceted Beads


Special Cuts

Choose from some rare gems and unusual cuts that are not normally found for sale to use in your jewellery or add to your crystal collection. Cuts include: Butterfly, elongated Triangles, a Millenium cut Pear, and a big cushion cut stone a bit like the hope diamond.


Special Cuts


Bag of Fake diamonds

This bag of fake diamonds is full of 56 popular gems for your jewellery, and they make really good gifts too, especially wedding gifts. The CZ's are the highest quality, which is the only quality we deal in.


Bag of Fake diamonds

Lab created Alexandrite

These lab created Alexandrites match the chemical properties of a natural Alexandrite (beryllium aluminium oxide), but unlike a natural Alexandrite they are flawless. These stones change colour, from green in sunlight, to purple in artificial light

Lab created Alexandrite
Created Alexandrite


Custom Gemstones

If you do not see the cuts and sizes you want here or the amount you want is not in stock then they can still be ordered,

please email sales@diamondcz.co.uk to arrange.

For custom cut gemstones there is a charge of £20 per cut and colour on top of the price of the stones. There could be a minimum order based on the size of the stone


Cubic Zirconia Information

How much like a diamond is cubic zirconia?

AAAAA Cubic zirconia is the best diamond simulant in the world. It is very hard or may be impossible to tell apart from a natural flawless diamond by site alone. Some sources say that jewellers can tell by white flashes in the diamond compared to more colourful flashes in the CZ, but other sources say that in controlled experiments experts were not able to pick out a diamond from a number of cubic zirconia. Another source claims an expert could not tell the difference between a CZ replica of a famous flawless diamond and the real thing

The problem is there are different qualities of CZ and the poor quality CZ's can be very poor, looking nothing like a diamond, this gives CZ a bad reputation. Other CZ stones are better quality but poorly cut or polished. It is not fair to judge Diamond CZ by one of these inferior stones. In a controlled test to see if an expert could pick out a diamond from a number of CZ's then the cz stones used would be top quality and cut the same as the diamond. The stones I sell are the best quality and the best cut, when buying a CZ as a diamond simulant you should choose these stones.

I think that identifying a CZ would normally be done by guess work, a CZ is always D white and flawless. A D White flawless stone is unlikely to be a natural diamond, so as soon as one is seen, it would be suspected to be CZ. But if the stone had flaws and sparkles like a diamond, then it is most likely to be a diamond.

All our Cubic Zirconia is cut and polished to the kind of standard you would expect a diamond to be cut and polished. Diamonds are cut by hand, so it is possible for a jeweller to tell by looking at the facets and see that it was machine cut. We sell hand cut CZ's too, these are even more accurate simulants because a diamond is always hand cut

How is it made?

CZ nearly always refers to synthetic man made cubic zirconia, but it also occurs naturally, natural cz is very rare. Synthetic CZ is made by heating zirconium oxide powder up to nearly 5000'F. Because it is so hot the powder needs to be heated from the centre outwards by radio waves so that the outer powder which is cooled by copper water pipes forms a crucible to contain it. As the mixture cools cz crystals grow. The zirconium oxide powder needs stabilisers and needs to be cooled carefully, the right balance of stabiliser and careful cooling determine the quality of the cubic zirconia.

The best quality crystals are flawless and are 8.5mohs in hardness. Lesser quality cubic zirconia is not so hard and may have small bubbles that implode and cause the stone to discolour over time, this doesn't happen with high quality cz. Because of its hardness it will last a long time, you can rub cz with ordinary sandpaper (not emery cloth) and it doesn't scratch.