Marquise cut diamonds for sale in Dallas, Texas at Shira Diamonds Dallas - Wholesale Diamonds and Custom Diamond Rings. Shira Diamonds Dallas is the largest marquise cut diamond dealer. We carry 100s of marquise cut diamonds in stock daily. This diamond is certified by EGL USA and is E in Color with an Si3 Clarity. If you would like to view this diamond please give us a call at 214-336-8629.