The most valuable black opal features bright red stone against a very black base. In the '80s and '90s, gem-quality brown diamonds were worth about $1,500 per carat, but now many sell for up to $ ...

Valentine’s Day is right around the corner, so if you’re last-minute shopping for someone special, nothing says “time well-spent” with a significant other than a luxury timepiece, so we’ve chosen 10 ...