Carat or Kilogram? Choosing the right unit for selling Rose Quartz and Amethyst from Madagascar

Reminder

The carat (ct) is the standard unit of measurement for evaluating the weight of precious and semi-precious stones, equivalent to 0.2 grams. Among semi-precious stones, rose quartz and amethyst belong to the quartz family, with an average density of 2.65 g/cm³.

Kilogram (kg) sales are prevalent in the semi-precious stone market for bulk purchases. Buying rough or minimally cut stones by the kilogram can encompass thousands of carats, making this method more cost-effective for artisans, lapidaries, and specialized resellers.

A beautiful piece of natural rose quartz from Madagascar

The Carat: the reference unit for international jewelry

Semi-precious stones, such as amethyst and rose quartz, have a relatively low density compared to sapphires, rubies, and diamonds for the same weight.

Carat-based pricing for semi-precious stones is influenced by several factors:

Cut and Shape: A well-executed cut optimizes brilliance and increases value.
Color Quality: The more intense and uniform the hue, the more desirable the stone.
Clarity and Transparency: Stones with fewer inclusions and excellent polish are more valuable.

The value of quartz, whether rose or amethyst, does not increase exponentially with the carat weight.

📏 Dimensional Example

A 1-carat rose quartz or amethyst stone measures approximately 6 to 7 mm in standard round cut.
Stones in the 5 to 10 carat range are common in jewelry, especially for rose quartz gems.

📌 Indicative price examples for general international market

Rose Quartz: $1 to $5 per carat for common qualities; up to $20 per carat for rare, highly transparent stones.
Amethyst: $5 to $50 per carat depending on color intensity, with "Deep Siberian" quality stones being the most valuable.

Kilogram sales: an advantageous option for resellers and wholesalers

Rough or bulk stones are sold in kilograms (kg), intended for wholesale resale, lithotherapy, decoration, or carving.

For wholesalers, artisans, and lapidaries, kilogram sales are often more advantageous:

Cost-effective, reduced cost per unit.
Large natural pieces available.
More flexible uses.

📌 Indicative price examples (International Market)

Rough Rose Quartz: $5 to $50 per kg depending on quality and transparency.
Rough Amethyst: $10 to $200 per kg, with higher quality crystals reaching higher values.

👉

Madagascar Rose Quartz

Gentle and translucent stone, often cut into cabochons or beads.
Available in large sizes without excessive price increases.
Stones in the 5 to 10 carat range are common in jewelry.

Madagascar Amethyst

Violet variety of quartz, more prized according to color intensity.
Available in large crystals, sometimes weighing hundreds of carats.
A 1-carat cut amethyst typically measures between 6 and 8 mm.

💡 Choosing between carat or kilogram sales allows for tailoring offerings to specific buyer expectations and market trends. For international professional resellers, managing carat weight is a key factor in pricing, market segmentation, and logistics.

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