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027 CT Brilliant Pear Natural Loose Diamond G SI1 430 x 350  260 mm
027 CT Brilliant Pear Natural Loose Diamond G SI1 430 x 350 260 mm
Paypal   US $506.41
051CT E VVS2 Round Brilliant Cut Loose Diamond 517 x 514 316 mm Natural
051CT E VVS2 Round Brilliant Cut Loose Diamond 517 x 514 316 mm Natural
Paypal   US $4,662.71
101Ct Round Brilliant G VS1 Matching Pair Diamond Natural Loose 49x49mm 2pcs
101Ct Round Brilliant G VS1 Matching Pair Diamond Natural Loose 49x49mm 2pcs
Paypal   US $4,030.81
101 Ct Round Brilliant Diamond Natural G VS2 Matching Pair Loose 49x5 3m 2pc
101 Ct Round Brilliant Diamond Natural G VS2 Matching Pair Loose 49x5 3m 2pc
Paypal   US $3,945.37
023 CT Pear Brilliant Natural Loose Diamond I SI1500 x 310  21 mm
023 CT Pear Brilliant Natural Loose Diamond I SI1500 x 310 21 mm
Paypal   US $372.91
051 CT Natural Round Brilliant Cut Loose Diamond F SI1 512 x 516 317 mm
051 CT Natural Round Brilliant Cut Loose Diamond F SI1 512 x 516 317 mm
Paypal   US $2,269.50
98 Ct Round Brilliant G SI1 Matching Pair Diamond Natural Loose 5 mm 2pcs
98 Ct Round Brilliant G SI1 Matching Pair Diamond Natural Loose 5 mm 2pcs
Paypal   US $3,318.81
203CT Round Brilliant Diamond Natural Whole Sale Lot Loose E VS1 11pcs 36mm
203CT Round Brilliant Diamond Natural Whole Sale Lot Loose E VS1 11pcs 36mm
Paypal   US $2,919.20
070 CT Loose Pear Natural Brilliant Diamond F VS1 671 x 535  312 mm
070 CT Loose Pear Natural Brilliant Diamond F VS1 671 x 535 312 mm
Paypal   US $2,936.11
038 Ct Round Brilliant Loose Diamond F VS1 Natural 464x466 mm
038 Ct Round Brilliant Loose Diamond F VS1 Natural 464x466 mm
Paypal   US $1,512.11
Beautiful 50 carat Marquise Brilliant cut loose diamond No Reserve Look
Beautiful 50 carat Marquise Brilliant cut loose diamond No Reserve Look
Paypal   US $305.00
013 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
013 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
Paypal   US $13.00
certified 024ct Natural Fancy Color Purplish Pink Brilliant Diamond Certificate
certified 024ct Natural Fancy Color Purplish Pink Brilliant Diamond Certificate
Paypal   US $2,395.00
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 198mm
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 198mm
Paypal   US $133.99
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 201mm
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 201mm
Paypal   US $133.99
160MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
160MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
170MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
170MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
130MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
130MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
145MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
145MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
172MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
172MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
Paypal   US $1.29
120MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
120MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
140MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
140MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
154MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
154MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
Paypal   US $.99
150MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
150MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
163MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
163MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
Brilliant Round Diamond 110 Carats I1 Clarity J K Color
Brilliant Round Diamond 110 Carats I1 Clarity J K Color
Paypal   US $999.00
FIERY WHITE FIRE GRAY DIAMOND ROUND BRILLIANT 104 CTS
FIERY WHITE FIRE GRAY DIAMOND ROUND BRILLIANT 104 CTS
Paypal   US $338.00
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 304 197mm
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 304 197mm
Paypal   US $123.99
FIERY LIGHT BROWN DIAMOND ROUND BRILLIANT 120 CTS
FIERY LIGHT BROWN DIAMOND ROUND BRILLIANT 120 CTS
Paypal   US $235.05
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 311 196mm
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 311 196mm
Paypal   US $123.99
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 313 194mm
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 313 194mm
Paypal   US $123.99
600 Ct Round Brilliant Cut Loose Black Diamond Pair for Jewelry Setting AAA
600 Ct Round Brilliant Cut Loose Black Diamond Pair for Jewelry Setting AAA
Paypal   US $251.33
225 Ct Round Brilliant Cut Loose Black Diamond Pair for Jewelry Setting AAAAA
225 Ct Round Brilliant Cut Loose Black Diamond Pair for Jewelry Setting AAAAA
Paypal   US $25.29
210 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
210 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
Paypal   US $93.26
25 cts BRILLIANT ROUND DIAMOND SI 2 CLARITY H COLOR
25 cts BRILLIANT ROUND DIAMOND SI 2 CLARITY H COLOR
Paypal   US $79.00
ROUND BRILLIANT CUT LOOSE NATURAL DIAMOND 60CT I I J COLOR
ROUND BRILLIANT CUT LOOSE NATURAL DIAMOND 60CT I I J COLOR
Paypal   US $199.00
50ct 5mm round brilliant white diamond
50ct 5mm round brilliant white diamond
Paypal   US $45.00
71 SI2 E Marquise Brilliant Cut Diamond INDEPENDENT GIA Appraised $3165
71 SI2 E Marquise Brilliant Cut Diamond INDEPENDENT GIA Appraised $3165
Paypal   US $1,099.00
SPARKLING GRAYISH GREEN DIAMOND ROUND BRILLIANT 103 CTS
SPARKLING GRAYISH GREEN DIAMOND ROUND BRILLIANT 103 CTS
Paypal   US $12.50
014 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
014 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
Paypal   US $11.50
026 Ct Supreme Hot Lustrous Unheated Brown Diamond Brilliant Round
026 Ct Supreme Hot Lustrous Unheated Brown Diamond Brilliant Round
Paypal   US $9.99
YELLOW FIRE BROWNISH GRAY DIAMOND ROUND BRILLIANT 196 CTS
YELLOW FIRE BROWNISH GRAY DIAMOND ROUND BRILLIANT 196 CTS
Paypal   US $22.50
FIERY GRAYISH BROWN DIAMOND ROUND BRILLIANT 017 CTS
FIERY GRAYISH BROWN DIAMOND ROUND BRILLIANT 017 CTS
Paypal   US $.99
SPARKLING LIGHT BROWNISH YELLOW DIAMOND ROUND BRILLIANT 100 CTS
SPARKLING LIGHT BROWNISH YELLOW DIAMOND ROUND BRILLIANT 100 CTS
Paypal   US $2.25
BEAUTIFUL ROUND BRILLIANT BLACK DIAMOND 742Cts NR
BEAUTIFUL ROUND BRILLIANT BLACK DIAMOND 742Cts NR
Paypal   US $305.00
326 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
326 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
Paypal   US $44.26
1015 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
1015 Ct Certified Earth Mined Round Brilliant Cut Black Diamond Solitaire AAA
Paypal   US $251.33
Round Brilliant Cut Natural 157 Ct Certified Black Loose Diamond Solitaire I3
Round Brilliant Cut Natural 157 Ct Certified Black Loose Diamond Solitaire I3
   US $73.43
Round Brilliant Cut 1300Ct Natural Certified Black Loose Diamond I3 Set of 10
Round Brilliant Cut 1300Ct Natural Certified Black Loose Diamond I3 Set of 10
   US $367.14
BRILLIANT CUT DIAMOND 16MM
BRILLIANT CUT DIAMOND 16MM
Paypal   US $1.99
014 Carat D Color VVS2 Round Brilliant Loose Diamond For Ring 319 206mm
014 Carat D Color VVS2 Round Brilliant Loose Diamond For Ring 319 206mm
Paypal   US $149.99
Certified 038 Carat J Color VVS2 Round Brilliant Loose Diamond For Ring 469mm
Certified 038 Carat J Color VVS2 Round Brilliant Loose Diamond For Ring 469mm
Paypal   US $421.99
Certified 093 Carat Top Light Brown VS2 Round Brilliant Loose Diamond 596x604
Certified 093 Carat Top Light Brown VS2 Round Brilliant Loose Diamond 596x604
Paypal   US $1,199.99
415 Ct Natural Certified Round Brilliant Cut Black Diamond Solitaire AAA
415 Ct Natural Certified Round Brilliant Cut Black Diamond Solitaire AAA
   US $91.78
011 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 306 183mm
011 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 306 183mm
Paypal   US $113.99
014 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 317 205mm
014 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 317 205mm
Paypal   US $149.99
CERTIFIED 109 CARAT H COLOR VS2 ROUND BRILLIANT LOOSE DIAMOND FOR RING
CERTIFIED 109 CARAT H COLOR VS2 ROUND BRILLIANT LOOSE DIAMOND FOR RING
Paypal   US $2,400.00
CERTIFIED 107 CARAT E COLOR SI2 ROUND BRILLIANT LOOSE DIAMOND FOR RING66mm
CERTIFIED 107 CARAT E COLOR SI2 ROUND BRILLIANT LOOSE DIAMOND FOR RING66mm
Paypal   US $1,975.00
015 Ct Supreme Hot Lustrous Unheated Yellow Diamond Brilliant Round
015 Ct Supreme Hot Lustrous Unheated Yellow Diamond Brilliant Round
Paypal   US $9.99
Diamond 23 ct G Color SI1 Clarity Brilliant and Fiery Eycleanish
Diamond 23 ct G Color SI1 Clarity Brilliant and Fiery Eycleanish
Paypal   US $54.00

What contributes to the appearance of size in a round brilliant diamond (besides the actual carat weight)?

Nothing about the diamond itself.

The setting can have an effect though. One style in white gold places large prongs which come to a flat about 1mm across roughly flush with the diamond's face. A .5 carat stone looks nearly twice it's size at first glance, but it's not going to fool her.

Her hand is the other consideration. Slender fingers make the whole ring, especially the diamond look larger.

027 CT Brilliant Pear Natural Loose Diamond G SI1 430 x 350  260 mm
027 CT Brilliant Pear Natural Loose Diamond G SI1 430 x 350 260 mm
Paypal   US $506.41
051CT E VVS2 Round Brilliant Cut Loose Diamond 517 x 514 316 mm Natural
051CT E VVS2 Round Brilliant Cut Loose Diamond 517 x 514 316 mm Natural
Paypal   US $4,662.71
101Ct Round Brilliant G VS1 Matching Pair Diamond Natural Loose 49x49mm 2pcs
101Ct Round Brilliant G VS1 Matching Pair Diamond Natural Loose 49x49mm 2pcs
Paypal   US $4,030.81
101 Ct Round Brilliant Diamond Natural G VS2 Matching Pair Loose 49x5 3m 2pc
101 Ct Round Brilliant Diamond Natural G VS2 Matching Pair Loose 49x5 3m 2pc
Paypal   US $3,945.37
023 CT Pear Brilliant Natural Loose Diamond I SI1500 x 310  21 mm
023 CT Pear Brilliant Natural Loose Diamond I SI1500 x 310 21 mm
Paypal   US $372.91
051 CT Natural Round Brilliant Cut Loose Diamond F SI1 512 x 516 317 mm
051 CT Natural Round Brilliant Cut Loose Diamond F SI1 512 x 516 317 mm
Paypal   US $2,269.50
98 Ct Round Brilliant G SI1 Matching Pair Diamond Natural Loose 5 mm 2pcs
98 Ct Round Brilliant G SI1 Matching Pair Diamond Natural Loose 5 mm 2pcs
Paypal   US $3,318.81
203CT Round Brilliant Diamond Natural Whole Sale Lot Loose E VS1 11pcs 36mm
203CT Round Brilliant Diamond Natural Whole Sale Lot Loose E VS1 11pcs 36mm
Paypal   US $2,919.20
070 CT Loose Pear Natural Brilliant Diamond F VS1 671 x 535  312 mm
070 CT Loose Pear Natural Brilliant Diamond F VS1 671 x 535 312 mm
Paypal   US $2,936.11
038 Ct Round Brilliant Loose Diamond F VS1 Natural 464x466 mm
038 Ct Round Brilliant Loose Diamond F VS1 Natural 464x466 mm
Paypal   US $1,512.11
Beautiful 50 carat Marquise Brilliant cut loose diamond No Reserve Look
Beautiful 50 carat Marquise Brilliant cut loose diamond No Reserve Look
Paypal   US $305.00
013 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
013 Ct Supreme Hot Lustrous 100Natural Unheated Yellow Diamond Brilliant Round
Paypal   US $13.00
certified 024ct Natural Fancy Color Purplish Pink Brilliant Diamond Certificate
certified 024ct Natural Fancy Color Purplish Pink Brilliant Diamond Certificate
Paypal   US $2,395.00
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 198mm
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 198mm
Paypal   US $133.99
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 201mm
013 Carat D Color VVS1 Round Brilliant Loose Diamond For Ring 319 201mm
Paypal   US $133.99
160MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
160MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
170MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
170MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
130MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
130MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
145MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
145MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
172MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
172MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
Paypal   US $1.29
120MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
120MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
140MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
140MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
154MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
154MM G SI2 ROUND BRILLIANT CUT LOOSE DIAMOND
Paypal   US $.99
150MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
150MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
163MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
163MM G SI2 ROUND BRILLIANT ACCENT REPLACING DIAMOND
Paypal   US $.99
Brilliant Round Diamond 110 Carats I1 Clarity J K Color
Brilliant Round Diamond 110 Carats I1 Clarity J K Color
Paypal   US $999.00
FIERY WHITE FIRE GRAY DIAMOND ROUND BRILLIANT 104 CTS
FIERY WHITE FIRE GRAY DIAMOND ROUND BRILLIANT 104 CTS
Paypal   US $338.00
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 304 197mm
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 304 197mm
Paypal   US $123.99
FIERY LIGHT BROWN DIAMOND ROUND BRILLIANT 120 CTS
FIERY LIGHT BROWN DIAMOND ROUND BRILLIANT 120 CTS
Paypal   US $235.05
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 311 196mm
012 Carat D Color VS1 Round Brilliant Loose Diamond For Ring 311 196mm
Paypal   US $123.99