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Sparkle Diamond

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117ct SPARKLING AQUA GREEN BLUE VS DIAMONDWHITE DIAMOND ACCENTS 14K GOLD RING    US $1,750.00

110ct SPARKLING AQUA BLUE DIAMOND WHITE DIAMOND ACCENTS 14K GOLD RING    US $2,350.00

Sparkling 054ct Diamond Gold Emerald Ring    US $499.00

Gorgeous ICE Diamond 14K white gold Heart Ring 18 Sparkling Diamonds Size 55    US $225.00

549Ct Beautiful Sparkling Black and White Diamond Engagement Ring 14k Free Ship    US $1,990.00

SPARKLING 058CT DIAMOND 14K GOLD AMETHYST RINGVJ    US $753.75

SPARKLING 110CT DIAMOND RUBY 14K SOLID GOLD RING    US $956.25

SPARKLING 058CT DIAMOND 14K GOLD AMETHYST RINGVJ    US $753.75

34ctw 10k YELLOW GOLD NATURAL BLUE DIAMOND RING 6 DIAMONDS SPARKLES Size 75    US $290.00

65ctw BLUE WHITE DIAMOND RING ROUND HEAVY WEIGHT SPARKLES Size 9    US $392.00

65ctw BLUE WHITE DIAMOND RING ROUND HEAVY WEIGHT SPARKLES Size 7    US $390.00

33ct 14k YELLOW GOLD AMAZING SPARKLING NATURAL BLUE DIAMOND RING NICE COLOR    US $280.00

10k 135ctw MENS DIAMOND ETERNITY BAND or WEDDING BAND WIDE AND NICE SPARKLES    US $980.00

27ctw HEART SHAPE NATURAL BLUE DIAMOND RING SPARKLES OF SKY BLUE COLOR Size 7    US $350.00

159ctw YELLOW GOLD BLUE DIAMOND RING WHITE DIAMONDSWEDDING RING SPARKLES    US $1,879.00

10k WHITE GOLD 72ctw BLUE WHITE DIAMOND RING AMAZING SPARKLES Size 675    US $610.00

50ctw HUGE MENS SPARKLING NATURAL BLUE DIAMOND RINGMENS WEDDING RING Size12    US $380.00

10k 45ctw NATURAL SPARKLING BLUE DIAMOND RING 7 DIAMONDS ANNIVERSARY RING    US $390.00

SPARKLING 10K GOLD DIAMOND CLUSTER RING SMALL25ctw size 7baguette round cut    US $139.99

MAKE YOUR LOVE SPARKLE 10K 3 DIAMOND HALO ENGAGEMENT RING SZ 5 1 4 R009 525    US $182.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 055 CT WEDDING ROUND CUT NEW    US $680.00

Sparkling 14K White Gold Diamond Ring    US $595.00

Sparkling 14K White Gold Diamond Ring Set    US $600.00

Sparkling 14K Yellow Gold Diamond Ring    US $695.00

Sparkling 14K Yellow Gold Diamond Ring    US $695.00

Precious Sparkling 10K Gold size 9 189 grams Ring 2 Diamonds with 1 Stone Thick    US $179.99

Precious Vibrant Sparkling 10K White Gold 3 Heart Ring Sz5 3 4 with 2 Diamonds    US $179.99

Stunning 14kt White Gold 157ctw Purple Red Ruby 28ctw sparkling Diamonds NR    US $399.99

SPARKLING 40CTS HEART SHAPED SI2 CHAMPAGNE DIAMOND RING 10K Y GOLD SEE VIDEO    US $499.99

VINTAGE 14K SPARKLING DIAMOND COCKTAIL RING QUITE NICE CHUNKY BAND SZ65 NR    US $925.00

^^ sparkling 17 carat diamond solitaire in 10k yellow gold ring size 7 1 4    US $69.00

BIG SPARKLE 155ct F VS2 Wedding Engagement DIAMOND RING 18K WHITE GOLD    US $1,440.00

Custom Made 14k Diamond Engagement Wedding Ring AMAZING Sparkle    US $5,750.00

Sparkling Green and White Diamond 25ctw Round 10k White Gold Ring Size 10    US $145.99

F VS MANS HEAVY 14K GOLD 82CT OLD EUROPEAN CUT DIAMOND RING 87g EXC SPARKLE    US $3,490.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 496 CT WEDDING ROUND CUT NEW    US $25,323.00

Stunning White Gold Band with sparkling diamond and gemstones 284 grams    US $89.00

Beautiful and Sparkling Diamond Ring    US $1,116.00

Sparkling Diamond Ring SZ 6 10cttw    US $29.99

18K WHITE GOLD SPARKLING DIAMONDS OPULENT DRESS RING    US $17,906.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 446 CT WEDDING ROUND CUT NEW    US $19,288.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 500 CT WEDDING ROUND CUT NEW    US $18,250.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 284 CT WEDDING PRINCESS CUT    US $13,016.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 284 CT WEDDING PRINCESS CUT    US $12,882.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 669 CT WEDDING ROUND CUT NEW    US $17,118.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 244 CT WEDDING PRINCESS CUT    US $12,389.00

SPARKLING 14KT WHITE GOLD DIAMOND ENGAGEMENT RING 594 CT WEDDING ROUND CUT NEW    US $15,963.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 325 CT WEDDING PRINCESS CUT    US $12,922.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 325 CT WEDDING PRINCESS CUT    US $12,922.00

SPARKLING 14KT YELLOW GOLD DIAMOND ENGAGEMENT RING 234 CT WEDDING PRINCESS CUT    US $8,171.00

why does a real diamond sparkles more than a zircon gem?

Any help would be appreciated.

Apart from the quality of the cutting there are two factors that are involved in "sparkle" which is not a very scientific term but I know what you mean. The first is the Refractive Index of the stone - in simple terms how much does the stone bend light as it goes through it. The second is Dispersion - a bit more complicated but when light goes through a prism (a diamond cut has many prism shapes in it) it is split into a rainbow and the dispersion is a measure of how wide the rainbow is (how far from red the blue is)
In this case diamond has higher figures than zircon (not CZ)
Diamond, R.I. 2.417 to 2.42 Dispersion 0.044
Zircon, R.I. 1.925 to 1.983 Dispersion 0.038
You can see that in both cases the figures for zircon are lower.