Table:
text: Diamond simulant
Artificial simulants
Summary table
Material Formula Refractive_indexes_589_3_nm Dispersion_431_687_nm Hardness_Mohs_scale Density_g_cm3 Thermal_Cond_ State_of_the_art_
Cubic Zirconia ZrO2(+ rare earths) ~ 2.2 ~ 0.06 ~ 8.3 ~ 5.7 Poor 1976 –
Moissanite SiC 2.648 – 2.691 0.104 8.5–9.25 3.2 High 1998 –
Quartz Silica 1.543 – 1.554  7- 2.50 – 2.65  Ancient

Question: What material has a high thermal state in Diamond Simulant?