Old combs made of tortoiseshell are very valuable.
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玳 is bound, used in 玳瑁 - the hawksbill sea turtle, whose patterned shell was prized for ornaments and luxury inlay. The word also names 玳瑁 as the tortoiseshell material itself.
The jade radical on the left, written like 王 but standing for 玉. It marks the character as a precious decorative material - tortoiseshell was treated like jade for ornaments. It groups 玳 with 瑁, 珠, and 玲.
