Apex domains cannot have CNAME records.
Question and response
Question
dig thisispearl.com. NS
Answer
thisispearl.com. 5 NS ns-1975.awsdns-54.co.uk.
thisispearl.com. 5 NS ns-17.awsdns-02.com.
thisispearl.com. 5 NS ns-783.awsdns-33.net.
thisispearl.com. 5 NS ns-1251.awsdns-28.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0