How long does it take to get my products?

Orders are usually delivered within 2 days. Domestic shipping can take up to 5 business days.Foreign shipping could take up to 14 business days or more, depending on customs delays.Due to global supply chain challenges, shipping times could be longer than usual.

Do you offer refunds?

Yes, we offer full and partial refunds.Please enquire for more information about our Refund policy or click this link.

We ship using all the major carriers, including FedEx overnight delivery for orders over $500. We also ship internationally and have extensive knowledge of shipping internationally.

What makes Muzo emeralds different from other Colombian emeralds?

Muzo is a specific mine in Boyacá, Colombia, known for producing emeralds with an exceptionally deep, warm green color, referred to as "Muzo green" in the trade. While Colombia is the world's leading emerald source overall, Muzo-origin stones are considered among the finest, commanding significant premiums at auction over emeralds from other Colombian mines like Chivor or Coscuez. A GRS or AGL origin report will specify "Colombia, Muzo" as the source.

What does "no oil" or "minor oil" mean on an emerald certificate?

Nearly all natural emeralds contain internal fractures. "Oiling", or filling those fractures with cedar oil or resin, which is a standard industry practice that improves clarity. A "no oil" designation means the stone has not been treated and is in its natural state, which is rare and significantly increases value. "Minor oil" indicates minimal treatment. Both grades are considered acceptable by major auction houses; heavy or significant oiling affects value substantially. The treatment grade is always disclosed on a GRS, AGL, or GIA certificate.

Are Muzo emeralds a good investment?

Top-quality Colombian emeralds, particularly no-oil or minor-oil Muzo stones above 3 carats with strong color saturation, have historically held and appreciated in value, especially when accompanied by origin reports from GRS or AGL. Unlike diamonds, fine colored stones remain largely exempt from lab-grown alternatives at the collector level, which supports long-term demand.

Muzo Colombian Emerald Jewelry | GIA & GRS Certified

Shop certified Muzo Colombian emerald jewelry at Assay. GIA & GRS certified. Rings, necklaces & more - each stone traceable to the Muzo mine.

Muzo is one of the oldest and most storied emerald mines in Colombia — and the source of the world's most coveted green. The deep, warm "Muzo green" is distinct from any other origin, recognized by collectors and auction houses as the benchmark for fine emeralds.

Every piece in this collection features a center stone traceable to the Muzo mine, certified by GIA, GRS, AGL, or equivalent. Certification documents the stone's Colombian origin, treatment status (no oil or minor oil), and quality grades — so you know exactly what you're buying.

We carry Muzo emeralds set in rings, necklaces, and pendants, ranging from wearable fine jewelry to investment-grade rarities.

Orders are usually delivered within 2 days. Domestic shipping can take up to 5 business days.

Foreign shipping could take up to 14 business days or more, depending on customs delays.

Due to global supply chain challenges, shipping times could be longer than usual.
Yes, we offer full and partial refunds.

Please enquire for more information about our Refund policy or click this link.
We ship using all the major carriers, including FedEx overnight delivery for orders over $500. We also ship internationally and have extensive knowledge of shipping internationally.
Muzo is a specific mine in Boyacá, Colombia, known for producing emeralds with an exceptionally deep, warm green color, referred to as "Muzo green" in the trade. While Colombia is the world's leading emerald source overall, Muzo-origin stones are considered among the finest, commanding significant premiums at auction over emeralds from other Colombian mines like Chivor or Coscuez. A GRS or AGL origin report will specify "Colombia, Muzo" as the source.
Nearly all natural emeralds contain internal fractures. "Oiling", or filling those fractures with cedar oil or resin, which is a standard industry practice that improves clarity. A "no oil" designation means the stone has not been treated and is in its natural state, which is rare and significantly increases value. "Minor oil" indicates minimal treatment. Both grades are considered acceptable by major auction houses; heavy or significant oiling affects value substantially. The treatment grade is always disclosed on a GRS, AGL, or GIA certificate.
Top-quality Colombian emeralds, particularly no-oil or minor-oil Muzo stones above 3 carats with strong color saturation, have historically held and appreciated in value, especially when accompanied by origin reports from GRS or AGL. Unlike diamonds, fine colored stones remain largely exempt from lab-grown alternatives at the collector level, which supports long-term demand.

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