Matsyapurana 90.2

90.2

madhyamaḥ pañcaśatikas triśatenādhamaḥ smṛtaḥ
caturthāṃśena viṣkambhaparvatāḥ syuḥ samantataḥ //

I am now going to explain to you about the mount of gems. The mount of one thousand pearls is the first best; of 500 pearls the second best, and of 300 pearls the last best. The spurs (viṣkambha) in the corners should be made and located in their proper places, the quantity consisting of one-fourth of the main mount.—1-2.