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‘Blue hole’ is largest ever discovered at 1.3K feet deep — and scientists haven’t reached the bottom yetThese sprawling sapphire sinkholes often extend hundreds of feet down and can measure an equal or greater distance across as well. However, scholarship on blue holes is often limited as the lack ...
In its sophisticated Colombo, Sri Lanka facility, the sustainable sapphire dealer and miner CEYLONS Munich is training young ...
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