It might be related to a type of Space Exotic Beast called the Star Remnant Rift Beast. When they are killed, the runaway energy briefly opens a micro-wormhole.
The largest of these eight Space Gemstones contained five to six cubic kilometers of space, while even the smallest held dozens of cubic meters. Li Xiang activated his Crystal Gold Armor and set these Gemstones into rings, bracelets, necklaces, and armbands, crafting them into exquisite pieces of jewelry.
He had previously owned jewelry firms and a Jade Processing Factory. Although he later transitioned into the restaurant business, he had retained a small number of his Gold Jewelry shops. With chain stores in 72 Hive Underground Cities across the country, he still had a considerable foundation in the jewelry trade.
