Tell Us More

Share a bit more information with us
to finalize your Free Quote request.

You are looking for information regarding:

2 to 10+ carat
Round Diamond
Country
United States Afghanistan Aland Islands Albania Algeria American Samoa Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Chinese Taipei Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d'Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic East Timor Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hong Kong Hungary Iceland India Indonesia Iran Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea Korea, Democratic People's Republic of Korea, Republic of Korea (South) Kuwait Kyrgyzstan Lao People's Democratic Republic Laos Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Northern Mariana Islands Norway Oman Pakistan Palestinian Territory, Occupied Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Qatar Republic of China Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Serbia and Montenegro Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Minor Outlying Islands Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe

Dec. 2001

Researchers at the Gemological Institute published findings from the second of their multi-part scientific study on diamond cut. This study concerns the effect of proportions on "fire" in round brilliants, and was published in the Fall 2001 issue of the Institute’s peer-reviewed journal, Gems and Gemology.

The main conclusion: There is no single "best" set of proportions for a round brilliant that maximizes fire. In other words, there is no one "Ideal" cut.

The researchers also found that the lengths of star- and lower- girdle facets play an important role in improving both fire and brilliance, something ignored in most previous studies on cut.

GIA president William E. Boyajian has said the Institute plans to add more information regarding cut to its diamond grading reports in 2002.

In many ways, GIA is just confirming what the market already knows. And yet the market still pays more for "Ideal" cuts (AGS triple zeros). Again, this is not necessarily because Ideals are measurably more brilliant or fiery, but because many carriage-trade jewelers will only buy Ideal cuts. These jewelers like to have an edge; by selling something different they get a bigger margin. It’s the same logic that’s behind the push for "branding" and for stones with extra-facet. As GIA president William E. Boyajian has said in the past: "The term ‘Ideal’ is confusing … We cannot recommend its use in modern times."

Related Articles

Most popular diamond shapes at the moment
Blog Archive

Most popular diamond shapes at the moment

Green diamonds: the growing buzz
Blog Archive

Green diamonds: the growing buzz

Throwback: 5-carat blue diamond sold for nearly $14M
Blog Archive

Throwback: 5-carat blue diamond sold for nearly $14M

WhatsApp chat