Wednesday, January 18, 2023
Monday, February 12, 2024
与我国钻石荧光级别分级相比较,仅在GIA证书中出现的钻石荧光级别是()。A、很弱B、强C、极强D、无...
Saturday, June 10, 2023
Monday, February 12, 2024
()合成钻石在DiamondView下可见生长分区,()合成钻石在DiamondView下可见平行层状生长纹理。...
Saturday, April 1, 2023
Saturday, February 17, 2024
钻石形成的条件非常苛刻,它是一种在()条件下产生的矿物晶体。...
Friday, May 10, 2024
标准比色石不得带有除()以外的色调A、绿色B、黄色C、褐色D、白色...
Wednesday, January 10, 2024
Tuesday, September 13, 2022
Friday, May 10, 2024
Saturday, February 17, 2024
Tuesday, June 20, 2023
Friday, June 16, 2023
现有一颗切工极好的钻石,用游标卡尺测得它的平均直径为5.20mm,下列最接近它的实际重量的是()A、1.5ctB、1.00ctC、0.8ctD、0.5ct...
Thursday, February 16, 2023
Wednesday, January 10, 2024
Monday, September 25, 2023
Saturday, February 17, 2024
Tuesday, September 13, 2022
我国钻石分级体系中比色石的颜色是该颜色级别的()A、上限B、下限C、中间D、任意位置...
Sunday, March 31, 2024