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C A S T I L L O

Gold “GEM COMPANY” logo with thin horizontal lines and a small diamond icon on a white background

L A K E W O O D,  C O L O R A D O

(720) 708-0312

Museum Quality Jewelry & Gemstone Pieces

Rare Gemstones - Collector, Highest Quality

Curated Over Decades. Crafted into Timeless Jewelry. Offered with Integrity.

Red oval gemstone ring with diamond accents on a dark reflective background

Text reads: “Serious Inquiries and Reasonable Offers Will Be Considered.”

17.96ct Paraiba GIA Certified $75,000

Text banner reading “Serious Inquiries and Reasonable Offers Will Be Considered”

19.86ct Tanzanite Pendant GIA Certified $32,995


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3.33ct Paraiba GIA Certified $14,995

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4.42ct Natural Australian White Opal $5,900

Why Choose C A S T I L L O  GEM COMPANY?



For over 30 years, Castillo Gem Company has specialized in exceptional natural gemstones, custom jewelry, and personalized service. Every gemstone is carefully selected for its beauty, rarity, and lasting value, with many accompanied by independent certifications from respected laboratories such as GIA.


Whether you're searching for an investment-quality gemstone, a one-of-a-kind engagement ring, or a custom-designed heirloom, we are committed to providing honest guidance, complete transparency, and uncompromising craftsmanship.


Private Consultations Welcome • Custom Jewelry • GIA Certified Gemstones •


Serious Inquiries & Reasonable Offers Welcome