Classic Diamond Round Brilliant
Showing 97–120 of 609 results
Natural Gemstone Jewelry & Loose Gemstones at Earth’s Treasury
Welcome to Earth’s Treasury! If you’re looking for beautiful precision-cut loose gemstones or custom-designed natural gemstone jewelry, you’ve come to the right place. Earth’s Treasury features one of the widest selections of ethically sourced colored gemstones available online. We work closely with professional artisans who craft beautiful jewelry using gemstones that come directly from the mine to the market. Sapphires, rubies, emeralds, tourmalines, tanzanite, aquamarine—we have it all!
At Earth’s Treasury, we love the process of working with clients to help make their custom natural gemstone jewelry vision come to life. Whether you prefer a classically styled piece or a truly unique custom design, we can make it happen. We will work with you through the design, prototyping, casting, and production processes to craft your dream piece of jewelry.
While our collections contain colored gemstones from all over the world, our true passion is for North American gemstones. We work with American miners to source stones such as the brilliant Montana sapphire, gorgeous Oregon sunstone and colorful tourmaline from California and Maine. There is a remarkable diversity of colored gemstones available right here in America, many of which are rarer and more valuable than diamonds!
If you have any questions about our collection, don’t hesitate to reach out to us. We’re here to help you through the process of finding the perfect natural gemstone jewelry or loose gemstones online.
1.73-Carat Pale Blue Sapphire 
2.66-Carat Violet Purple Ceylon Sapphire 
1.85-Carat Sky Blue Montana Sapphire (Heated) 
1.72-Carat Gray-Aqua Montana Sapphire (Heated) 
0.71-Carat Pale Lavender Montana Sapphire (Heated) 
1.82-Carat Medium Blue Montana Sapphire (Heated) 
1.10-Carat Light Violet-Blue Madagascar Sapphire 
2.20-Carat Peacock Blue-Yellow Particolored Montana Sapphire (Heated) 
1.78-Carat Intense Orange Montana Sapphire (Heated) 
1.47-Carat Rich Blue Montana Sapphire (Heated) 
1.25-Carat Sky Blue Montana Sapphire (Heated) 
2.38-Carat Purple Umba Sapphire 
2.23-Carat Deep Peacock Blue Montana Sapphire (Heated) 
1.20-Carat Pale Yellow Montana Sapphire (Heated) 
0.97-Carat Medium Blue Montana Sapphire (Heated) 
1.05-Carat Pale Aqua-Gray Montana Sapphire 
Accented Montana Sapphire Earrings- Cushion, 5.0mm (Heated) 
1.90-Carat Pale Gray Montana Sapphire 
1.17-Carat Bright Yellow California Tourmaline 
2.15-Carat Rich Teal Blue Montana Sapphire (Heated) 
The "Dazzle" Halo Necklace- Robin's Egg Blue, 5.5 mm (Heated) 
0.84-Carat Pale Yellow-Green Montana Sapphire (Heated) 
1.06-Carat Aqua Blue Montana Sapphire (Heated) 
1.32-Carat Yellow Australian Sapphire 
1.20-Carat Aqua Blue Montana Sapphire (Heated) 
1.43-Carat Deep-Lime Green Particolored Australian Sapphire 
1.39-Carat Deep Blue-Teal Bicolored Montana Sapphire (Heated) 
1.15-Carat Sky Blue Montana Sapphire (Heated) 
1.40-Carat Sky Blue Montana Sapphire (Heated) 
2.06-Carat Rich Blue Ceylon Sapphire (Heated) 
1.95-Carat Bright Green Tsavorite Garnet 
1.61-Carat Teal Blue Montana Sapphire (Heated) 
0.86-Carat Magenta Montana Sapphire 
2.91-Carat Olive Green Australian Sapphire (Heated) 
1.37-Carat Pale Pink Montana Sapphire 
0.81-Carat Medium Blue Montana Sapphire (Heated) 
1.06-Carat Teal Blue Montana Sapphire (Heated) 
1.78-Carat Robin's Egg Blue Montana Sapphire (Heated) 
1.30-Carat Cornflower Blue Ceylon Sapphire 
1.62-Carat Lilac Purple Umba Sapphire 
1.08-Carat Blue-Green Umba Sapphire 
1.73-Carat Golden Yellow Montana Sapphire (Heated) 
2.36-Carat Yellowish Green Australian Sapphire 
1.52-Carat Midnight Blue-Green Australian Sapphire 
1.24-Carat Yellow-Green Particolored Australian Sapphire (Heated) 
1.41-Carat Magenta Umba Sapphire 
1.44-Carat Hazy Magenta Pink Umba Sapphire 
2.06-Carat Medium Blue Montana Sapphire (Heated) 
2.61-Carat Cornflower Blue Madagascar Sapphire 
1.34-Carat Blue-Teal Particolored Montana Sapphire (Heated) 
1.41-Carat Teal Blue Montana Sapphire (Heated) 
1.79-Carat Rich Blue Montana Sapphire (Heated) 
0.99-Carat Violet-Blue Montana Sapphire (Heated) 
2.00-Carat Light Steely Blue Montana Sapphire (Heated) 
1.19-Carat Rich Blue Montana Sapphire (Heated) 
1.46-Carat Deep Blue-Teal Bicolored Montana Sapphire (Heated) 
1.47-Carat Medium Blue Montana Sapphire (Heated) 
1.38-Carat Pale Aqua Blue Montana Sapphire (Heated) 
2.08-Carat Medium Blue Montana Sapphire (Heated) 
1.94-Carat Midnight Blue-Green Australian Sapphire 
1.51-Carat Blue-Aqua Particolored Montana Sapphire (Heated) 
1.09-Carat Sky Blue Montana Sapphire (Heated) 
0.85-Carat Blue-Green Montana Sapphire (Heated) 
2.03-Carat Pinkish Purple Madagascar Sapphire (Heated) 
2.06-Carat Bubblegum Pink Ceylon Sapphire (Heated) 
0.95-Carat Nasarawa Teal Aqua 
1.30-Carat Lemon Yellow Australian Sapphire 
0.44-Carat Orange Montana Sapphire (Heated) 
2.69-Carat Blue-Green Montana Sapphire (Heated) 
1.17-Carat Teal Blue Montana Sapphire (Heated) 
1.24-Carat Rich Blue Montana Sapphire (Heated) 
0.53-Carat Pale Lavender Montana Sapphire 
0.88-Carat Medium Blue Montana Sapphire (Heated) 
0.81-Carat Light Violet-Blue Montana Sapphire (Heated)