Hello, @afaqshakoor,
Those are actually the SVG icons, and you have to use the Custom CSS to make them the default color, please copy and paste the below given CSS code to XStore >> Theme Settings >> Theme Custom CSS >> Global CSS and check back to your site after removing the browser cache.
.single-product-socials a[data-tooltip='Facebook'] {
color: #3b5998 !important;
}
.single-product-socials a[data-tooltip='Whatsapp'] {
color: #25D366 !important;
}
.single-product-socials a[data-tooltip='Twitter'] {
color: #00acee !important;
}
.single-product-socials a[data-tooltip='Linkedin'] {
color: #0072b1 !important;
}
.single-product-socials a[data-tooltip='Pinterest'] {
color: #c8232c !important;
}
Resulting Screenshot: https://postimg.cc/qt4kF2rP
Regards 8Themes Team.