This is lot of 42.9 carats of natural rough emerald crystals from Swat, Pakistan represents an opportunity for professional lapidaries and gemstone cutters / faceting. 

Lot Specifications

• Total Weight: 42.9 carats
• Origin: Swat Valley, Pakistan
• Stone Type: Natural Emerald (Beryl variety)
• Treatment: None - Natural, untreated rough material
• Gem Type: Precious gemstone, faceting rough
• Crystal System: Hexagonal
• Birthstone: May
• Condition: Natural rough state

Individual Stone Weights

This lot includes a diverse range of sizes perfect for various cutting projects:

• Larger stones: 4.35, 2.60, 2.40, 2.20, 1.95, 1.90, 1.80 (×2), 1.70, 1.65, 1.60 (×2) carats per piece
• Medium stones: 1.40, 1.25 (×2), 1.10, 1.00 carats
• Smaller parcels: 12 carats of under-1-carat pieces ideal for accent stones or practice material

Color & Clarity Profile

These Swat emeralds exhibit the classic color range from vibrant grass green to deeper forest green tones. The clarity varies across the lot, offering options from eye-clean material suitable for premium faceted gems to included crystals perfect for cabochons or learning projects. Natural inclusions (jardin) are characteristic of emerald and confirm authenticity.

Ideal For

• Professional gem cutters seeking quality rough material
• Jewelry designers requiring custom-cut emeralds
• Lapidary students and hobbyists
• Collectors of natural emerald specimens
• Investment-grade gemstone rough

Why Swat Emeralds?

Swat Valley emeralds are known for their exceptional color saturation and brilliance. The geological conditions in this region produce emeralds with distinctive characteristics that rival Colombian material. This rough represents authentic, ethically sourced material from one of the world's premier emerald localities.

Frequently Asked Questions - Rough Emeralds for Faceting

Q1: What yield can I expect when faceting rough emerald crystals like these?

A: Emerald rough typically yields 20-40% of the original weight when faceted, depending on the crystal's shape, clarity, and inclusions. For this lot, the hexagonal crystal structure of emerald allows for efficient cutting, but expect to lose material when removing surface fractures and optimizing color. Cleaner pieces in the 2-4 carat range may yield closer to 35-40%, while heavily included material might yield 15-25%. Always examine each piece under magnification and plan your cuts to maximize both size and clarity. The smaller under-1-carat pieces are excellent for practicing window evaluation and orientation before cutting your premium stones.

Q2: What cutting considerations are unique to emerald compared to other gemstones?

A: Emerald requires special care during faceting due to its relative brittleness (7.5-8 on Mohs scale) and characteristic inclusions. Key considerations include: (1) Orientation: Cut parallel to the c-axis to maximize color depth; (2) Inclusion management: Plan facet placement to minimize visible jardin while accepting that some inclusions are normal and expected; (3) Heat sensitivity: Use lower speeds and frequent cooling - emerald can fracture from heat buildup; (4) Dopping: Use low-temperature wax or mechanical dops to avoid thermal shock; (5) Polish direction: Emerald polishes best in specific crystallographic directions - test on smaller pieces first. The traditional emerald cut (step cut with truncated corners) was developed specifically to protect the stone's vulnerable corners and showcase its color.

Q3: How should I evaluate and prepare rough emerald before cutting?

A: Proper evaluation is critical for maximizing value from emerald rough. Start by cleaning each crystal with warm soapy water and a soft brush to remove surface debris. Examine under both natural and artificial light to assess color distribution - emerald color can be zoned, so identify the best color areas. Use a 10x loupe or microscope to map internal inclusions, fractures, and potential cleavage planes. Immerse stones in water or oil to see internal features more clearly (this simulates how they'll look when cut and oiled, a common emerald treatment). Check for surface-reaching fractures that might propagate during cutting. Plan your cut to: maximize the best color zone, avoid or minimize visible inclusions in the table area, orient the table perpendicular to the c-axis for optimal color, and consider whether a stone is better suited for faceting or cabochon cutting based on clarity. For this mixed lot, sort pieces by clarity grade and size, then match cutting plans to each stone's potential.