{"id":108504,"date":"2025-07-02T15:54:03","date_gmt":"2025-07-02T13:54:03","guid":{"rendered":"https:\/\/laboratornidiamanty.cz\/how-to-choose-ring-size\/"},"modified":"2026-09-21T20:58:53","modified_gmt":"2026-09-21T18:58:53","slug":"how-to-choose-ring-size","status":"publish","type":"post","link":"https:\/\/laboratornidiamanty.cz\/en\/how-to-choose-ring-size\/","title":{"rendered":"How to Choose the Right Ring Size?"},"content":{"rendered":"<h3 class=\"MsoNormal\" style=\"color: #000000;\"><b> <\/b><\/h3>\n<h3 style=\"color: #000000;\"><b>How to choose the size of a ring with a lab-grown diamond?<\/b><\/h3>\n<p style=\"text-align: left;\" data-start=\"237\" data-end=\"541\"><span style=\"color: #000000;\">Choosing the right ring size is a key step when buying a ring with a lab-grown diamond. Choosing the wrong size can mean an unpleasant return or a disappointing gift. In this article you will learn how to measure your ring size accurately, how to convert between European and American sizes, and how to avoid the most common mistakes.<\/span><\/p>\n<p data-start=\"543\" data-end=\"595\"><strong><span style=\"color: #000000;\">1. Why it is important to know your exact ring size<\/span><\/strong><\/p>\n<p data-start=\"597\" data-end=\"800\"><span style=\"color: #000000;\">A ring with a lab-grown diamond that is too tight can be uncomfortable and hard to remove. Conversely, a loose ring can slip off and get lost. The right size ensures comfortable wear of your luxury lab-grown diamond ring while also keeping it securely on your finger.<\/span><\/p>\n<p data-start=\"802\" data-end=\"843\"><strong><span style=\"color: #000000;\">2. How to measure your ring size correctly <\/span><\/strong><\/p>\n<p data-start=\"845\" data-end=\"898\"><span style=\"color: #000000;\">There are two basic ways to measure your finger size for rings from the luxury <a href=\"https:\/\/laboratornidiamanty.cz\/en\/product-category\/engagement-rings-en\/\">Sirius<\/a> collection: <\/span><\/p>\n<p data-start=\"900\" data-end=\"919\"><span style=\"color: #000000;\">a) Measuring your finger<\/span><\/p>\n<ul data-start=\"921\" data-end=\"1133\">\n<li data-start=\"921\" data-end=\"988\">\n<p data-start=\"923\" data-end=\"988\"><span style=\"color: #000000;\">Take a thin strip of paper, a soft tape measure, or a non-elastic thread.<\/span><\/p>\n<\/li>\n<li data-start=\"989\" data-end=\"1035\">\n<p data-start=\"991\" data-end=\"1035\"><span style=\"color: #000000;\">Wrap it around the finger where the ring will be worn.<\/span><\/p>\n<\/li>\n<li data-start=\"1036\" data-end=\"1078\">\n<p data-start=\"1038\" data-end=\"1078\"><span style=\"color: #000000;\">Mark the point where the material overlaps.<\/span><\/p>\n<\/li>\n<li data-start=\"1079\" data-end=\"1133\">\n<p data-start=\"1081\" data-end=\"1133\"><span style=\"color: #000000;\">Measure the length in millimetres \u2013 this is your finger circumference.<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1135\" data-end=\"1250\"><span style=\"color: #000000;\"><strong data-start=\"1135\" data-end=\"1148\">Important:<\/strong> Measure in the evening, when fingers are most swollen, and never after physical activity or in cold weather.<\/span><\/p>\n<p data-start=\"1252\" data-end=\"1292\"><span style=\"color: #000000;\">b) Measuring using an existing ring<\/span><\/p>\n<ul data-start=\"1294\" data-end=\"1448\">\n<li data-start=\"1294\" data-end=\"1335\">\n<p data-start=\"1296\" data-end=\"1335\"><span style=\"color: #000000;\">Use a ruler or a calliper.<\/span><\/p>\n<\/li>\n<li data-start=\"1336\" data-end=\"1395\">\n<p data-start=\"1338\" data-end=\"1395\"><span style=\"color: #000000;\">Measure the inner diameter of the ring in millimetres (excluding the band edges).<\/span><\/p>\n<\/li>\n<li data-start=\"1396\" data-end=\"1448\">\n<p data-start=\"1398\" data-end=\"1448\"><span style=\"color: #000000;\">Compare the measured value with the size chart.<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1450\" data-end=\"1494\"><strong><span style=\"color: #000000;\">3. Converting between EU and US ring sizes<\/span><\/strong><\/p>\n<p data-start=\"1496\" data-end=\"1641\"><span style=\"color: #000000;\">Ring sizes vary by country. In Europe (including the Czech Republic), the <strong data-start=\"1569\" data-end=\"1591\">inner circumference in mm<\/strong> is used, while in the USA a <strong data-start=\"1620\" data-end=\"1640\">numeric scale<\/strong> is used.<\/span><\/p>\n<p data-start=\"1643\" data-end=\"1689\"><span style=\"color: #000000;\">Here is an approximate conversion table (EU 41\u201367):<\/span><\/p>\n<div class=\"_tableWrapper_80l1q_14 group flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1691\" data-end=\"3603\">\n<thead data-start=\"1691\" data-end=\"1755\">\n<tr data-start=\"1691\" data-end=\"1755\">\n<th data-start=\"1691\" data-end=\"1718\" data-col-size=\"sm\"><span style=\"color: #000000;\">EU size (circumference in mm)<\/span><\/th>\n<th data-start=\"1718\" data-end=\"1732\" data-col-size=\"sm\"><span style=\"color: #000000;\">US size<\/span><\/th>\n<th data-start=\"1732\" data-end=\"1755\" data-col-size=\"sm\"><span style=\"color: #000000;\">Inner diameter (mm)<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1822\" data-end=\"3603\">\n<tr data-start=\"1822\" data-end=\"1887\">\n<td data-start=\"1822\" data-end=\"1849\" data-col-size=\"sm\"><span style=\"color: #000000;\">41<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1849\" data-end=\"1863\"><span style=\"color: #000000;\">1<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1863\" data-end=\"1887\"><span style=\"color: #000000;\">13.0<\/span><\/td>\n<\/tr>\n<tr data-start=\"1888\" data-end=\"1953\">\n<td data-start=\"1888\" data-end=\"1915\" data-col-size=\"sm\"><span style=\"color: #000000;\">42<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1915\" data-end=\"1929\"><span style=\"color: #000000;\">2<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1929\" data-end=\"1953\"><span style=\"color: #000000;\">13.3<\/span><\/td>\n<\/tr>\n<tr data-start=\"1954\" data-end=\"2019\">\n<td data-start=\"1954\" data-end=\"1981\" data-col-size=\"sm\"><span style=\"color: #000000;\">43<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1981\" data-end=\"1995\"><span style=\"color: #000000;\">2.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"1995\" data-end=\"2019\"><span style=\"color: #000000;\">13.7<\/span><\/td>\n<\/tr>\n<tr data-start=\"2020\" data-end=\"2085\">\n<td data-start=\"2020\" data-end=\"2047\" data-col-size=\"sm\"><span style=\"color: #000000;\">44<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2047\" data-end=\"2061\"><span style=\"color: #000000;\">3<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2061\" data-end=\"2085\"><span style=\"color: #000000;\">14.0<\/span><\/td>\n<\/tr>\n<tr data-start=\"2086\" data-end=\"2151\">\n<td data-start=\"2086\" data-end=\"2113\" data-col-size=\"sm\"><span style=\"color: #000000;\">45<\/span><\/td>\n<td data-start=\"2113\" data-end=\"2127\" data-col-size=\"sm\"><span style=\"color: #000000;\">3.5<\/span><\/td>\n<td data-start=\"2127\" data-end=\"2151\" data-col-size=\"sm\"><span style=\"color: #000000;\">14.3<\/span><\/td>\n<\/tr>\n<tr data-start=\"2152\" data-end=\"2217\">\n<td data-start=\"2152\" data-end=\"2179\" data-col-size=\"sm\"><span style=\"color: #000000;\">46<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2179\" data-end=\"2193\"><span style=\"color: #000000;\">4<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2193\" data-end=\"2217\"><span style=\"color: #000000;\">14.6<\/span><\/td>\n<\/tr>\n<tr data-start=\"2218\" data-end=\"2283\">\n<td data-start=\"2218\" data-end=\"2245\" data-col-size=\"sm\"><span style=\"color: #000000;\">47<\/span><\/td>\n<td data-start=\"2245\" data-end=\"2259\" data-col-size=\"sm\"><span style=\"color: #000000;\">4.25<\/span><\/td>\n<td data-start=\"2259\" data-end=\"2283\" data-col-size=\"sm\"><span style=\"color: #000000;\">15.0<\/span><\/td>\n<\/tr>\n<tr data-start=\"2284\" data-end=\"2349\">\n<td data-start=\"2284\" data-end=\"2311\" data-col-size=\"sm\"><span style=\"color: #000000;\">48<\/span><\/td>\n<td data-start=\"2311\" data-end=\"2325\" data-col-size=\"sm\"><span style=\"color: #000000;\">4.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2325\" data-end=\"2349\"><span style=\"color: #000000;\">15.3<\/span><\/td>\n<\/tr>\n<tr data-start=\"2350\" data-end=\"2415\">\n<td data-start=\"2350\" data-end=\"2377\" data-col-size=\"sm\"><span style=\"color: #000000;\">49<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2377\" data-end=\"2391\"><span style=\"color: #000000;\">5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2391\" data-end=\"2415\"><span style=\"color: #000000;\">15.6<\/span><\/td>\n<\/tr>\n<tr data-start=\"2416\" data-end=\"2481\">\n<td data-start=\"2416\" data-end=\"2443\" data-col-size=\"sm\"><span style=\"color: #000000;\">50<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2443\" data-end=\"2457\"><span style=\"color: #000000;\">5.25<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2457\" data-end=\"2481\"><span style=\"color: #000000;\">15.9<\/span><\/td>\n<\/tr>\n<tr data-start=\"2482\" data-end=\"2547\">\n<td data-start=\"2482\" data-end=\"2509\" data-col-size=\"sm\"><span style=\"color: #000000;\">51<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2509\" data-end=\"2523\"><span style=\"color: #000000;\">5.75<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2523\" data-end=\"2547\"><span style=\"color: #000000;\">16.2<\/span><\/td>\n<\/tr>\n<tr data-start=\"2548\" data-end=\"2613\">\n<td data-start=\"2548\" data-end=\"2575\" data-col-size=\"sm\"><span style=\"color: #000000;\">52<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2575\" data-end=\"2589\"><span style=\"color: #000000;\">6<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2589\" data-end=\"2613\"><span style=\"color: #000000;\">16.5<\/span><\/td>\n<\/tr>\n<tr data-start=\"2614\" data-end=\"2679\">\n<td data-start=\"2614\" data-end=\"2641\" data-col-size=\"sm\"><span style=\"color: #000000;\">53<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2641\" data-end=\"2655\"><span style=\"color: #000000;\">6.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2655\" data-end=\"2679\"><span style=\"color: #000000;\">16.9<\/span><\/td>\n<\/tr>\n<tr data-start=\"2680\" data-end=\"2745\">\n<td data-start=\"2680\" data-end=\"2707\" data-col-size=\"sm\"><span style=\"color: #000000;\">54<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2707\" data-end=\"2721\"><span style=\"color: #000000;\">7<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2721\" data-end=\"2745\"><span style=\"color: #000000;\">17.2<\/span><\/td>\n<\/tr>\n<tr data-start=\"2746\" data-end=\"2811\">\n<td data-start=\"2746\" data-end=\"2773\" data-col-size=\"sm\"><span style=\"color: #000000;\">55<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2773\" data-end=\"2787\"><span style=\"color: #000000;\">7.25<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2787\" data-end=\"2811\"><span style=\"color: #000000;\">17.5<\/span><\/td>\n<\/tr>\n<tr data-start=\"2812\" data-end=\"2877\">\n<td data-start=\"2812\" data-end=\"2839\" data-col-size=\"sm\"><span style=\"color: #000000;\">56<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2839\" data-end=\"2853\"><span style=\"color: #000000;\">7.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2853\" data-end=\"2877\"><span style=\"color: #000000;\">17.8<\/span><\/td>\n<\/tr>\n<tr data-start=\"2878\" data-end=\"2943\">\n<td data-start=\"2878\" data-end=\"2905\" data-col-size=\"sm\"><span style=\"color: #000000;\">57<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2905\" data-end=\"2919\"><span style=\"color: #000000;\">8<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2919\" data-end=\"2943\"><span style=\"color: #000000;\">18.1<\/span><\/td>\n<\/tr>\n<tr data-start=\"2944\" data-end=\"3009\">\n<td data-start=\"2944\" data-end=\"2971\" data-col-size=\"sm\"><span style=\"color: #000000;\">58<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2971\" data-end=\"2985\"><span style=\"color: #000000;\">8.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"2985\" data-end=\"3009\"><span style=\"color: #000000;\">18.5<\/span><\/td>\n<\/tr>\n<tr data-start=\"3010\" data-end=\"3075\">\n<td data-start=\"3010\" data-end=\"3037\" data-col-size=\"sm\"><span style=\"color: #000000;\">59<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3037\" data-end=\"3051\"><span style=\"color: #000000;\">9<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3051\" data-end=\"3075\"><span style=\"color: #000000;\">18.8<\/span><\/td>\n<\/tr>\n<tr data-start=\"3076\" data-end=\"3141\">\n<td data-start=\"3076\" data-end=\"3103\" data-col-size=\"sm\"><span style=\"color: #000000;\">60<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3103\" data-end=\"3117\"><span style=\"color: #000000;\">9.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3117\" data-end=\"3141\"><span style=\"color: #000000;\">19.1<\/span><\/td>\n<\/tr>\n<tr data-start=\"3142\" data-end=\"3207\">\n<td data-start=\"3142\" data-end=\"3169\" data-col-size=\"sm\"><span style=\"color: #000000;\">61<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3169\" data-end=\"3183\"><span style=\"color: #000000;\">10<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3183\" data-end=\"3207\"><span style=\"color: #000000;\">19.4<\/span><\/td>\n<\/tr>\n<tr data-start=\"3208\" data-end=\"3273\">\n<td data-start=\"3208\" data-end=\"3235\" data-col-size=\"sm\"><span style=\"color: #000000;\">62<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3235\" data-end=\"3249\"><span style=\"color: #000000;\">10.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3249\" data-end=\"3273\"><span style=\"color: #000000;\">19.7<\/span><\/td>\n<\/tr>\n<tr data-start=\"3274\" data-end=\"3339\">\n<td data-start=\"3274\" data-end=\"3301\" data-col-size=\"sm\"><span style=\"color: #000000;\">63<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3301\" data-end=\"3315\"><span style=\"color: #000000;\">11<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3315\" data-end=\"3339\"><span style=\"color: #000000;\">20.1<\/span><\/td>\n<\/tr>\n<tr data-start=\"3340\" data-end=\"3405\">\n<td data-start=\"3340\" data-end=\"3367\" data-col-size=\"sm\"><span style=\"color: #000000;\">64<\/span><\/td>\n<td data-start=\"3367\" data-end=\"3381\" data-col-size=\"sm\"><span style=\"color: #000000;\">11.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3381\" data-end=\"3405\"><span style=\"color: #000000;\">20.4<\/span><\/td>\n<\/tr>\n<tr data-start=\"3406\" data-end=\"3471\">\n<td data-start=\"3406\" data-end=\"3433\" data-col-size=\"sm\"><span style=\"color: #000000;\">65<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3433\" data-end=\"3447\"><span style=\"color: #000000;\">11.75<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3447\" data-end=\"3471\"><span style=\"color: #000000;\">20.7<\/span><\/td>\n<\/tr>\n<tr data-start=\"3472\" data-end=\"3537\">\n<td data-start=\"3472\" data-end=\"3499\" data-col-size=\"sm\"><span style=\"color: #000000;\">66<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3499\" data-end=\"3513\"><span style=\"color: #000000;\">12<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3513\" data-end=\"3537\"><span style=\"color: #000000;\">21.0<\/span><\/td>\n<\/tr>\n<tr data-start=\"3538\" data-end=\"3603\">\n<td data-start=\"3538\" data-end=\"3565\" data-col-size=\"sm\"><span style=\"color: #000000;\">67<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3565\" data-end=\"3579\"><span style=\"color: #000000;\">12.5<\/span><\/td>\n<td data-col-size=\"sm\" data-start=\"3579\" data-end=\"3603\"><span style=\"color: #000000;\">21.3<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"sticky end-(--thread-content-margin) h-0 self-end select-none\">\n<div class=\"absolute end-0 flex items-end\"> <\/div>\n<\/div>\n<\/div>\n<p data-start=\"3607\" data-end=\"3718\"><span style=\"color: #000000;\">Tip: If you are between two sizes, it is recommended to choose the larger one \u2013 the ring will then go on more easily.<\/span><\/p>\n<p data-start=\"3720\" data-end=\"3760\"><span style=\"color: #000000;\"><strong>4. Interesting facts about our lab-grown diamond rings<\/strong>:<\/span><\/p>\n<ul data-start=\"3762\" data-end=\"4158\">\n<li data-start=\"3762\" data-end=\"3896\">\n<p data-start=\"3764\" data-end=\"3896\"><span style=\"color: #000000;\"><strong data-start=\"3764\" data-end=\"3781\">Band width<\/strong> affects the size \u2013 wider rings tend to fit more tightly, so it is recommended to choose a size half to one number larger<\/span><\/p>\n<\/li>\n<li data-start=\"4040\" data-end=\"4158\">\n<p data-start=\"4042\" data-end=\"4158\"><span style=\"color: #000000;\"><strong data-start=\"4042\" data-end=\"4074\">Finger size changes over time<\/strong> \u2013 age, temperature, physical activity or pregnancy can temporarily change your finger&#8217;s circumference.<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4160\" data-end=\"4198\"><strong><span style=\"color: #000000;\">5. Common mistakes when measuring size<\/span><\/strong><\/p>\n<ul data-start=\"4200\" data-end=\"4355\">\n<li data-start=\"4200\" data-end=\"4231\">\n<p data-start=\"4202\" data-end=\"4231\"><span style=\"color: #000000;\">Measuring at an unsuitable time of day<\/span><\/p>\n<\/li>\n<li data-start=\"4232\" data-end=\"4279\">\n<p data-start=\"4234\" data-end=\"4279\"><span style=\"color: #000000;\">Using elastic material (e.g. a rubber band)<\/span><\/p>\n<\/li>\n<li data-start=\"4280\" data-end=\"4321\">\n<p data-start=\"4282\" data-end=\"4321\"><span style=\"color: #000000;\">Inaccurate measurement of the diameter of an old ring<\/span><\/p>\n<\/li>\n<li data-start=\"4322\" data-end=\"4355\">\n<p data-start=\"4324\" data-end=\"4355\"><span style=\"color: #000000;\">Ignoring the width and type of the ring<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4373\" data-end=\"4665\"><span style=\"color: #000000;\">Choosing the right ring size is not complicated once you know how. Whether you are choosing a ring for yourself or as a gift, always check the size against verified charts and measure your finger the correct way. If you are unsure, feel free to contact us <\/span><span style=\"color: #000000;\">via WhatsApp: +420 777 222 121.<\/span><\/p>\n<p style=\"color: #000000;\"><span style=\"color: #000000;\">If you are still undecided, send us an inquiry and we will promptly send you an offer you can compare with no obligation. <\/span><\/p>\n<p style=\"color: #000000;\"><span style=\"color: #000000;\">We look forward to hearing from you soon! <\/span><\/p>\n<p><span style=\"color: #000000;\">If you have any questions about lab-grown &amp; natural diamonds, feel free to write to us at: <a style=\"color: #000000;\" href=\"mailto:info@laboratornidiamanty.cz\">info@laboratornidiamanty.cz<\/a> <\/span><\/p>\n<p><span style=\"color: #000000;\">Team ULTIMATE-GEMS s. r. o. <\/span><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to choose the size of a ring with a lab-grown diamond? Choosing the right ring size is a key step when buying a ring with<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":2,"featured_media":108530,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-108504","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Choose the Right Ring Size? - Lab-grown diamonds<\/title>\n<meta name=\"description\" content=\"How to choose the correct size for a ring with a lab-grown or natural diamond? 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