Loose diamonds in a variety of colors and cuts

We give new meaning to finding "a rare gem." We search for the most unusual modern and antique cuts available within our network of trusted and talented suppliers and strive to know as much as possible about the supply chain of every stone that makes its way into a piece of Mociun jewelry.

Ethics & Responsibility

Diamonds: Overview

Diamonds: The 4Cs

The value of a diamond is based on these four "C" qualities set by GIA (Geological Institute of America).

Grading Colored Gemstones

While there is no standardized grading system for colored gemstones like sapphires and emeralds, several variables are considered to determine the value. Color is one of the most important factors and can be analyzed by its hue, tone (lightness vs. darkness) and saturation (the hue’s intensity). Origin and treatment also impact value.

Clarity is also a significant factor, but the standards for colored gemstones are different from those of a diamond. Gemologists will grade most colored stones as “eye clean” (showing no inclusions to the naked eye), slightly included, moderately included or heavily included. However, inclusions are tolerated as long they do not compromise the beauty of the stone.

We will always source the most unusual, striking gemstones for our clients while carefully considering all standards and variables.

We strive for transparency. Finding out more about the story behind your jewelry should be as easy as wearing it.









Gold is most coveted for its aesthetic qualities and malleability. Its purity is measured in karats: one karat represents 1/24 of the whole, so 24k means 100% pure, naturally yellow gold. 24k gold is too soft for everyday wear, so for our jewelry, we recommend platinum and 14k or 18k gold, which is pure gold mixed with other metals, creating a stronger, more durable alloy. We love working with richly-colored 22k gold for jewelry that does not contain any stones.

We are happy to discuss requests for any desired materials in addition to the metals listed here.


We strive to use 100% responsibly sourced, eco-friendly or recycled gold when possible. Our precious metals are currently cast in New York City by a trusted network of partners whose practices align with our philosophy on responsible jewelry-making and guarantee nimble timelines and fair pricing. At this time, we are in the process of finding a partner that uses recycled metals in addition to recycled gold to create a certified 100% recycled alloy. Please contact us if you have any questions about our precious metals.

We are here to support treasure hunters on their search for the rare, the beautiful and the enduring.