Loose Cubic Zirconia New in Stock 1 Carat lots of Moissanite From £20.74 per carat 1 Carat Lots of Moissanite round brilliant hearts and arrows cut. All sizes from 0.7mm to 2.9mm in 1 carat lots at the latest lowest prices. Click picture above to see prices. Buy gems in any quantity Highest quality CZ that does not fade over time. Cut to high quality, please see our video's. Quick and painless ordering. All gems are in stock, ready for quick dispatch from the uk. 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.

Small amounts of gems that can be easily told apart will be packaged together. If you would like to have them packed seperately there are options in the basket 6A Quality AAAAA Quality AAA Quality 10 Hearts & Arrows 8 Hearts & Arrows Star Machine Cut Swarovski CZ Moissanite Flower & Hearts Wholesale Lots Round Brilliant Princess Plus Princess Pear Emerald Oval Heart Marquise Old European Cut OEC Style 2 OEC Style 3 OEC Style 4 Old Mine Cut Old Mine Pillow Transitional Cut Portugese Asscher Baguette Barion Cut Brilliant Cushion Brilliant Pillow Vintage Cushion Rectangular Cushion Trillion Trillion Style 2 Modern Radiant Original Radiant Radiant Style 2 Sunflower Special Rectangular Asscher Rectangular Princess Sq Modern Radiant Beads Concave Antique Style Rose Cut Full Flat back Rose Cornered Baguette Emerald Princess Synthetic Diamond Created Emerald Lab Columbia Emerald Lab Created Ruby Flawed lab Ruby Lab Blue Sapphire Lab Diff. Sapphire Czochralski Pulled Lab Created Spinel Lab yellow Sapphire Lab White Sapphire Created Alexandrite Lab Star Ruby Lab Star Sapphire Cultured Sapphire Lab Created Opal Sq Original Radiant Star Tapered Baguette Trapezoid Emerald Trapezoid Princess Princess Baguette Tear Drop Nanocrystal Mystic CZ Natural Gemstones Carre Cut Bags Packaging Services Cornered Emerald Sales & Unique Individual Stones 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. 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. 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 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?

Cubic zirconia has been made synthetically since 1976 and is still the best diamond simulant in the world today. When cut the same way as a diamond, it may be impossible to tell apart from a natural flawless diamond by sight alone without being examined under magnification, this is because the refractive index and dispersion are too close to that of a diamond to tell apart.

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 6A Cubic Zirconia is cut and polished to look like diamonds as much as possible. 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, our larger 6A stones, 5mm and over, are also cut by hand

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.