Minerals and Metals in Ancient India v2.c43.s3.t2.9
Minerals and Metals in Ancient India v2.c43.s3.t2.9
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v2.c43.s3.t2.9
At that time, spinel ruby was known as *lāl*. At times, ruby (9), spinel ruby (8), hyacinth variety of zircon (7-1/2) and hessonite variety of garnet (7-1/4), appeared to have similar reddish yellow colour, but these could be easily distinguished from one another by scratch tests since their hardness values (given in parenthesis) are different.