I call these two-tier diamond cuts as they exhibit the higher crown and deeper depth, this really allows for a tremendous amount of light to reflect through these old diamonds. Total diamond carat weight (this is only an estimate and not exact) looks to be approximately 1/2. The diamonds are just beautiful in person and there are no eye visible black carbon spots or cloudiness to distract from the superior charm in this piece, although under a loop I believe one of the side diamonds has a flaw that cannot be seen with the naked eye (already priced in). Current ring size is a 7 1/4 and should be sizable by your local jeweler if need be by up to two sizes, without effecting the integrity of the band. The hallmark is difficult to decipher and so the gold content of this time period is most often in the range of 14-18k, with the prongs being in white gold and the band in yellow gold.Note that due to the age of Antique rings it is not uncommon for heirloom pieces to exhibit microscopic or tiny inclusions due to age. The item "Antique Old 1920's European Cut 3 Stone (Diamond Engagement Ring)" is in sale since Saturday, April 18, 2020. This item is in the category "Jewelry & Watches\Engagement & Wedding\Engagement Rings\Diamond". The seller is "loveantiques7" and is located in Atlanta, Georgia. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Costa rica, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Pakistan, Paraguay, Reunion.