Why Are Heart-Shaped Emeralds So Rare?

Emeralds have a natural network of fissures and inclusions known in the trade as jardin. This is a geological characteristic of Colombian emeralds rather than a flaw, but it makes cutting a process that demands careful technical judgment and carries considerable risk.

The standard emerald cut was developed for this gemstone. Its rectangular facets help retain as much of the rough stone's weight as possible while distributing stress and reducing the risk of fractures along existing fissures. A heart-shaped cut does not offer the same protection. The inward curves of the two lobes and the pointed tip each test the stone's structural integrity as well as the cutter's judgment.

The fact that this emerald could be fashioned into a heart shape speaks to the stability of its internal structure, allowing it to take a form rarely chosen for this gemstone.

Colombia: Why Origin Sets the Starting Point for Value

The color of Colombian emeralds is determined by the balance of chromium and vanadium, a balance shaped by geological conditions that can vary considerably from one mining area to another. Emeralds from the Muzo mining area are known for their chromium-derived color, displaying what the trade recognizes as a particularly rich Vivid Green: a pure grass-green glow that seems to come from within, with neither a gray cast nor a blue overtone. It is Colombia's geological signature.

This premium for origin is supported by market figures. According to market research, Colombian emeralds command prices per carat that are 30% to 50% higher than emeralds of comparable quality from Zambia or Brazil. In 2014, Sotheby's sold a ring set with a 35.72-carat No Oil emerald from Muzo for US$4.4 million, exceeding US$120,000 per carat. In late 2023, another Colombian emerald ring set a new sale record at US$4.6 million. Both transactions shared two key attributes: Colombian origin and a very low degree of oil treatment.

Source: Sotheby's Official Website

How the Jewelry Market Values Insignificant Oil Treatment

An emerald's oil-treatment status is one of the most important individual factors affecting its price, with grades ranging from No Oil through Insignificant, Minor, Moderate, and Significant, each carrying a substantially different market valuation.

Top-quality Colombian emeralds with No Oil status occupy the highest tier, yet they are exceptionally scarce in the market. Industry estimates suggest that gem-quality emeralds meeting No Oil criteria account for no more than 0.5% of the total market. Insignificant follows closely: the amount of oil is at the lowest measurable level, and the stone's color and clarity do not depend on oil treatment for their appearance. Research indicates that, for stones of comparable quality, emeralds graded Insignificant or No Oil can command two to four times the price of those graded Minor Oil.

Jardin: This Emerald's Signature

Jardin is French for "garden." The natural inclusions formed as an emerald grows, including microscopic fissures, fluid inclusions, and traces of other minerals, make every stone unique. This is more than a way of describing imperfections; it is a gemological tradition. When light passes through an emerald, the patterns you see are traces of its geological history. This stone retains its jardin, preserving the character that makes it its own.

JUSTLEE's Gemstone Selection Standards, Refined over Fifty Years

JUSTLEE selected this emerald not for perfection, but for a combination of attributes found less often than many might imagine: Vivid Green color, Colombian origin, GRS certification, and an Insignificant degree of oil treatment.

Add the structural demands of a heart-shaped cut, and this stone's very existence becomes the result of a series of choices. The cutter chose it. JUSTLEE chose it. Some stones must wait for the right person before the meaning of that wait becomes clear.

Explore more: JUSTLEE's Curated Emeralds ,JUSTLEE's Gemstone Selection Standards over Fifty Years

Compiled by the JUSTLEE Consultant Team with reference to GRS (Gem Research Swisslab) grading standards and the following publicly available sources: Sotheby's, "A Closer Look At The 4 Most Expensive Colombian Emerald Rings Sold At Auction" (December 2023 sale records); Emerald Whisper, "Colombian Emerald Price Guide: 2026–2027 Market Trends"; and the market valuation model used by the RubyGlint Emerald Value Calculator.