Wholesale Marquise Diamonds in Dallas, Texas. Shira Diamonds Dallas specializes in Marquise Cut Diamonds. We have 100s of marquise cut diamonds for sale that are EGL Certified. This marquise cut diamond is H in color and S11 in Clarity. The size of this marquise cut diamond is 1 Carat. If you would like to view this marquise cut diamond please give us a call at 214-336-8629.