around 29.4/9.6/6.1mm icy not big. Please refer to the coin and the measurements. Thanks.
No crack. No hairline. Without a certificate but a 100% natural guarantee.
Pendant holder: alloy.
necklace chain: gold plated alloy. (price is not including this chain, I will give it as a gift, if you don't want it, please let me know. Thanks)