Ruby 3.64 ct | Oval Cabochon | Purplish Red | Johnson, Tanzania | Untreated

SKU: RYS011 Category: Tag:

Untreated Ruby of 3.64 ct from Johnson, Tanzania, cut as an elegant oval cabochon and showing a rich purplish red color. A natural ruby with classic cabochon appeal, ideal for distinctive jewelry creations or as a refined addition to a gemstone collection.

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Description

This 3.64 ct Ruby from Johnson, Tanzania displays a rich purplish red color and has been fashioned as an oval cabochon, a cut that highlights the gemstone’s bodycolor and natural character in a particularly elegant way. As an untreated ruby, it is especially appealing for buyers who value authenticity and gemstones in their natural, unenhanced state.

Purplish red color with refined depth
The ruby shows a pleasing red color with a subtle purple modifier, creating a soft, slightly velvety appearance. In cabochon form, this color is displayed across the smooth curved surface in a broad and even manner, giving the stone a noble and expressive look.

Oval cabochon — timeless and elegant
The oval cabochon cut emphasizes color, texture, and material rather than faceted brilliance. This gives the ruby a classic and distinguished presence, making it especially suitable for jewelry designs that focus on the gem itself. It is particularly well suited for statement rings, pendants, bespoke jewelry, and collector’s pieces.

Untreated ruby from Tanzania
Untreated rubies are especially appreciated for their natural character, as they have not undergone standard enhancement. With a weight of 3.64 ct, this gemstone offers strong presence and individuality, making it an excellent choice for a one-of-a-kind jewelry design or a carefully selected ruby collection.

A natural untreated Tanzanian ruby with rich purplish red color and classic oval cabochon styling—distinctive, timeless, and full of character.

Additional Information

Certification Options

Every gemstone purchased from Gem Fountain includes a free Gem Fountain Gemstone Report, provided as a PDF file, documenting the key characteristics and authenticity of the stone.

For customers who require independent laboratory verification, we offer the option to add third-party gemstone reports. Upon selection, the gemstone will be submitted to the chosen accredited gemological laboratory. Estimated fees and processing times are as follows:

  • BGL – Brief Report: USD 19
    Processing time: approximately 1–2 business days
  • AIG – Brief Report: USD 38
    Processing time: approximately 7–8 business days
  • LOTUS – Soft Cover Report: USD 128
    Processing time: approximately 7–8 business days

All external reports are optional and can be selected as an add-on prior to shipment. Processing times may vary slightly depending on laboratory workload.

Shipping & Payment

All gemstones are shipped directly from Thailand, one of the world’s leading gemstone trading hubs. We deliver to almost all countries worldwide, using reliable and insured shipping partners to ensure safe and secure delivery. Each order is carefully packaged, and tracking details are provided once the shipment has been dispatched. Delivery times may vary depending on destination and local customs procedures. Any applicable duties, taxes, or import fees are the responsibility of the recipient.

We offer flexible payment options to accommodate our international clientele. Most common payment methods are accepted at checkout. Customers who choose to pay via wire transfer (Wise) receive a 5% discount, which can be selected directly during the checkout process.

Specification

Overview
Total Carat3.64 ct / 1 pcs
Region / MineJohnson
Country of OriginTanzania
Saturation / ToneIntense
ShadePurplish
ColorRed
TransperencyTransparent
Stone TypeType II
ClarityNI
Dimensions 1 (L/W/H)9.00 x 7.40 x 5.00 mm
Untreated

No indication of artificial enhancement.

Read more about common gemstone treatments →
Refractive Index nω = 1.768–1.772 & nε = 1.760–1.763
Birefringence 0.008
Hardness (Mohs) 9
Gravity 3.98 – 4.06
Crystal System Trigonal
Chemical Formular Al2O3, Aluminium oxide