Carat weight and measurements of moissanite is as follows: 0.5ct=5.0mm, 1.0ct=6.5mm, 2.0ct=8.0mm , 3.0ct=9.0mm, 4.0ct=10.0mm, 5.0ct=11mm. All moissanite stones are certified by GRA, each moissanite stone has a laser number on girdle, the number is match the GRA certificate report number , our certificate include a black card , it has a QR code and website for you to check the stones you bought. There is an error of ±0.05mm in dimensioning and manual actual measurement. Industry rules: the weight of the moissanite is indicated as the weight of the diamond. The actual weight of the Moissanite should be the marked weight of the diamond 90%.Example: The actual weight of the moissanite marked as 1 carat is0.88- 0.91 carats. Natural yellowish green color moissanite stone, never fade color and support wax setting, a very beautiful color.