Page Six may be compensated and/or receive an affiliate commission if you click or buy through our links. Featured pricing is subject to change. Diamonds are everybody’s best friend. While we love fashion jewelry as much as the next bauble collector, having favorite pieces permanently lose their lustre is always tragic. On the other hand, real gems and metals shine forever, making them worth the extra spend. So, when we spotted diamond tennis bracelets deeply discounted at Macy’s — we’re talking up to 66% off — it was too good a deal not to share. Made with lab-grown diamonds (that skip the environmental and ethical concerns of mined…