1.0Diamant Museumhttps://diamondmuseum.com/nladminhttps://diamondmuseum.com/nl/author/admin/rich600338<blockquote class="wp-embedded-content" data-secret="F4lI1IgW1o"><a href="https://diamondmuseum.com/nl/the-4-cs/">De vier C's</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://diamondmuseum.com/nl/the-4-cs/embed/#?secret=F4lI1IgW1o" width="600" height="338" title="“The 4 C’s” — Diamond Museum" data-secret="F4lI1IgW1o" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://diamondmuseum.com/wp-includes/js/wp-embed.min.js </script>The value of a diamond is determined by 4 quality factors. These were established in Amsterdam in 1975, during the congress of the World Federation of Diamond Bourses (W.F.D.B.) and the International Diamond Manufacturers Association (I.D.M.A.). It became known as the system of the 4 C’s, after the words Carat, Colour, Cut and Clarity. The […]